Faqs - NanJing TranzBrillix Linear Motion Co., Ltd.

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Q I designed my system using McMaster or MISUMI part numbers. Can you offer compatible components?

Yes, in many cases we can.
Many engineers use McMaster-Carr and MISUMI as their design libraries because CAD models are easy to download. We don’t sell those original brands, but we can often provide dimensionally compatible, cost-effective alternatives.

However, it is very important to distinguish between:

Standard parts that can be direct drop-in replacements, and
Assemblies that must be replaced as a complete set (rail + block).

1. Direct drop-in standard parts (easy replacements)

For components that follow common ISO/JIS or industry standards, we can usually supply dimensionally equivalent parts:

Linear shafts and shaft supports
- Metric and inch linear shafts
- Shaft supports such as SK / SHF / T-shaped supports
Linear ball bearings
- Standard LM / LME series
- Flanged types LMF / LMK
- Housed units SC / SCS / SBR blocks
Ball screw assemblies
- Standard metric ball screws (e.g. SFU series)
- With standard end machining for BK/BF, FK/FF, EK/EF supports
- In many cases, we can match the diameter, lead, support type and nut style to drop into your design

For these standardized parts, a McMaster or MISUMI part number is often enough to create a 1:1 dimensional alternative. Performance (load rating, life) may differ slightly by brand, but fit and function can usually be kept the same.

2. Full assembly replacements only (no mixing blocks and rails)

For linear guides (rail + block) and some proprietary assemblies, “compatible” does not mean you can mix components:

We can provide dimensionally interchangeable linear guide sets
- Same rail width, height and mounting hole pattern
- Same overall block height and reference dimensions
- Suitable to replace many MISUMI / McMaster branded guides as a set
⚠ Critical Warning: Do NOT mix brands on the same rail
- Even if two brands use the same nominal size (e.g. “HGH25”), the ball groove geometry, contact angle and tolerances are different.
- You must not buy only our block and mount it on an existing MISUMI, McMaster or other-brand rail (or the opposite).
- Mixing different brands’ blocks and rails can cause:
  - Very rough motion or jamming
  - Abnormal wear and loss of accuracy
  - In extreme cases, ball cage failure

Q How can I choose the right linear bearing type for my linear shaft?

Choosing a linear bearing is not only about shaft diameter. You must check:

Shaft hardness and tolerance (basic conditions)
Bearing format – raw LM vs housed SC/SBR units
Open vs closed type – floating shaft vs supported rail
Standard vs long type – stability and moment rigidity

1. Check shaft hardness and tolerance (basic conditions)

Hardness
- LM linear ball bearings are designed to run on hardened shafts (typically HRC 60+).
- If you use soft mild steel or soft 304 stainless with steel balls, the balls will quickly dig grooves into the shaft and destroy accuracy.
Tolerance
- The ID of LM bearings is made to fit precision ground shafts with g6 or h6 tolerance.
- If the shaft is too small (e.g. generic cold-drawn rod with big minus tolerance or poor roundness), the bearing will feel loose and wobble.
- If the shaft is too large (e.g. k6 or positive tolerance chrome bar), the bearing may jam, run rough or even break the ball cage.

Q What are the practical differences between hardened 45 steel (SUJ2/CF53) shafts and 304 stainless shafts？

The main differences are surface hardness, corrosion resistance and which bearing types they can safely work with.

1. Hardened carbon steel shafts (45# / SUJ2 / CF53)

Typical material and treatment
- Medium/high carbon steel or bearing steel (45#, SUJ2, CF53, etc.)
- Usually induction hardened on the surface to about HRC 60–64
- For industrial use, they are almost always hard chrome plated (hard chrome shaft), so they are not “bare raw steel".
Best suited for
- About 90% of industrial automation: CNC machines, linear modules, 3D printers, packaging, handling, etc.
- Any application using standard linear ball bearings (LM, LME series).
Bearing compatibility
- Hardened, chrome-plated surface with HRC 60+ is a perfect match for steel linear ball bearings.
- Ball hardness and shaft hardness are similar, so the surface can withstand the point contact stress without grooving.
Corrosion behaviour
- The hard chrome layer provides basic corrosion protection in indoor and normal workshop environments.
- In outdoor, splash water or aggressive environments they can still rust and may need extra protection (grease, wipers, boots).

2. 304 stainless steel shafts (soft stainless)

Material characteristics
- Austenitic stainless steel (304) cannot be through-hardened by heat treatment.
- Typical surface hardness is only around HRC 20–25, much softer than bearing steel.
Best suited for
- Food, beverage and pharmaceutical machinery
- Medical and semiconductor equipment
- Wet, hygienic or chemically aggressive environments where corrosion resistance is critical and loads are light to medium.
⚠ Critical warning: do NOT pair 304 shafts with standard steel linear ball bearings long term
- Steel balls in LM-type bearings are typically around HRC 60.
- When hard balls roll on a soft HRC 20–25 shaft under load, the contact stress is very high →
  - The balls will quickly indent and groove the shaft surface (Brinelling / grooving).
  - Precision, smoothness and shaft life drop dramatically.
- 304 stainless shafts are not meant to be used as “soft rails" for steel ball bearings in heavy or continuous-duty applications.
Correct pairings for 304 shafts
- Polymer bearings / plastic bushings (e.g. IGUS-type)
- Bronze / brass plain bushings
  These materials are softer than the shaft and distribute load better, so they will not destroy the 304 surface and can work in wet, washdown or no-lubrication conditions.

3. Need both hardness and corrosion resistance?

If you need:

High load capacity with steel linear ball bearings, and
Better corrosion resistance than chrome-plated carbon steel,

then consider:

440C martensitic stainless steel shafts
- Can be heat-treated to HRC ~58+
- Offer a compromise between stainless behaviour and high hardness
- More expensive than 45#/SUJ2 shafts and usually treated as a premium option.

Practical summary

Use hardened 45#/SUJ2/CF53 chrome-plated shafts for most industrial axes with LM/LME linear ball bearings.
Use 304 stainless shafts mainly when corrosion resistance and hygiene are more important than high load and long-life with ball bearings, and pair them with polymer or bronze bushings, not standard steel linear ball bearings.
If you need a fully stainless system with ball bearings and high load, look for 440C stainless shafts and matching stainless linear bearings.

Q Can you drill extra mounting holes or use a custom pitch on the guide rail according to my drawing?

Yes. We can machine additional mounting holes, special pitches and different end hole patterns on the rail according to your 2D drawing, as long as the minimum edge distance and hole spacing are respected for strength. For critical axes we recommend you send us the complete rail and base drawing so we can double-check the layout.

Q For long ball screws, how do I know the maximum safe speed before whipping occurs?

The critical speed of a ball screw is the rotational speed at which the screw starts to resonate and “whip" like a jump rope. It depends mainly on the screw diameter, unsupported length, and end support condition.

You can evaluate it in three steps:

1. Rule of thumb example (for SFU1605 with BK12/BF12)

As a practical example, take a common SFU1605 screw with standard fixed–supported (BK12/BF12) mounts:

Up to ~1000 mm: Usually safe to run in the 2000–3000 rpm range.
1000–1500 mm: Becomes a warning zone. It is safer to limit the top speed to 800–1000 rpm.
Longer than 1500 mm: The risk of whipping increases significantly. You must calculate the specific limit or upgrade the design.

2. Physics: Length is the killer ( $$propto 1/L^2$$ )

The critical speed is inversely proportional to the square of the unsupported length.

Physics: If you double the length, the allowable speed drops to one quarter.
This is why long, thin screws are so difficult to spin fast. Even a small reduction in unsupported length (minimizing overhang) can produce a big improvement in permitted RPM.

3. Three ways to increase critical speed

Option A – Larger Diameter (Most Direct):

Stiffness grows with diameter. Upgrading from 16 mm to 20 mm or 25 mm significantly increases stiffness, allowing higher speeds for the same length.
Option B – Improve End Supports (Most Economical):

Standard mounts are usually Fixed–Supported. If you upgrade to Fixed–Fixed (fixing both ends with BK units and applying tension/stretching to the screw), the critical speed can increase by ~50%.

Note: This requires precise mounting alignment.
Option C – Rotating Nut (Ultimate Solution for Long Axes):

Once travel exceeds 2–3 meters, spinning the screw becomes impractical.

The solution is to keep the screw stationary and rotate the nut (using a rotating nut assembly). Since the screw doesn't spin, there is no whipping, allowing for high speeds over very long distances.

Q How do I choose the lead of a ball screw to balance speed, thrust, resolution and Z-axis safety?

The lead of a ball screw defines how far the nut travels per one revolution of the screw. It affects:

Linear speed (mm/rev)
Thrust and effective “mechanical reduction”
Positioning resolution
Back-driving / self-locking behaviour on Z-axes
How your motor torque curve is used

You can think about it in four steps:

1. Basic trade-off: small lead vs large lead

Smaller lead (e.g. 2–5 mm):
- 1 rev = fewer millimetres of travel
- Acts like a higher gear reduction
  - More thrust for the same motor torque
  - Finer positioning resolution
- But for the same motor RPM, linear speed is lower
Larger lead (e.g. 10–20 mm):
- 1 rev = more millimetres of travel
- Acts like a lower gear reduction
  - Less thrust and lower resolution for the same motor
- But higher maximum linear speed at the same RPM

This is the “textbook” mechanical view. In real machines, two more things matter a lot: self-locking on vertical axes and the motor torque curve.

2. Z-axis safety: self-locking vs back-driving

Ball screws are generally efficient and can be back-driven, but lead still changes how easily gravity can move the axis:

Small leads (e.g. 2–5 mm):
- Smaller helix angle, more friction per unit of vertical force
- With the help of nut friction and motor holding torque, a light or medium Z-axis often behaves almost self-locking – it is hard to push down by hand and less likely to drop quickly when power is off.
Large leads (e.g. 10–20 mm):
- Larger helix angle, easier to back-drive
- A heavy spindle or Z-axis can slide down under its own weight as soon as power is removed if there is no brake or counterbalance.

Practical guidance:

For vertical Z-axes, especially on machines without brake motors, it is safer to use a smaller lead (4–5 mm) so the axis is less willing to fall when power is lost.
If you choose a large-lead screw on a heavy Z-axis, you should plan for a brake motor, counterweight or gas spring, otherwise a power cut can drop the head onto the workpiece or table.

3. Stepper motor torque vs RPM: why large lead can win at high speed

On paper, a smaller lead always gives more thrust for a given motor torque. But in practice:

Stepper motors lose torque rapidly at high RPM
- At 1500–2000 rpm, a typical stepper has much less torque than at 300–600 rpm
To reach a given linear speed with a small lead, the motor must spin much faster:
- Example:
  - 4 mm lead at 2000 rpm → 8 m/min
  - 10 mm lead at 800 rpm → 8 m/min
At 2000 rpm the motor torque may be very low, while at 800 rpm it is still in a stronger part of the torque curve.

The result is that for high-speed axes, a larger lead with lower motor RPM can actually deliver more usable thrust and better reliability than a small lead forced to spin very fast.

This is especially true for:

Long axes where screw critical speed limits RPM
Systems without high-voltage or high-current drivers to support very high motor speeds

4. Practical selection examples

Precision + high thrust, moderate speed:
- Small lead (e.g. 2–5 mm) is ideal when you want high resolution and don’t need extreme rapid speeds.
- Good for many Z-axes, precision positioning and heavier but slower axes.
General CNC X/Y axis (desktop to mid-size):
- Leads around 5–10 mm are commonly used.
- 5 mm gives a nice balance for many SFU1605 axes.
- 10 mm can be good for light but fast gantries when paired with a strong motor.
Vertical Z-axis without brake motor:
- Prefer smaller leads like 2–5 mm to reduce back-driving.
- If using 10–20 mm lead on a heavy head, plan for a brake or counterbalance.

In all cases, try to design so that the motor runs in the “plateau” region of its torque curve (not at the extreme high-RPM tail), and choose the lead accordingly instead of only looking at a simple “speed vs thrust” formula.

Q For a small desktop CNC, how do I choose between SFU1204, SFU1605, and SFU2005 ball screws?

SFU1204, SFU1605 and SFU2005 are common metric ball screws, but the choice is not only about “how big the machine is". You must consider diameter vs length (critical speed), lead and end support, and for larger diameters also rotational inertia.

1. Diameter vs length and critical speed (whipping)

The thinner and longer a screw is, the easier it will “whip" at high speed (like a jump rope). Critical speed depends on diameter, unsupported length and support type, but some practical rules of thumb (for rotating screws) are:

SFU1204 (12 mm diameter)
- Good for shorter strokes, e.g. up to about 400–600 mm at medium speed.
- When you approach 600–700 mm or more and want high RPM (around 1000 rpm), the risk of resonance and whipping increases sharply unless you keep speed low or improve supports.
SFU1605 (16 mm diameter)
- Noticeably higher stiffness than 1204.
- Commonly used for strokes around 400–1000/1200 mm at medium-to-high speeds with standard support (BK12/BF12).
SFU2005 (20 mm diameter)
- Chosen not only for load, but also to handle longer spans and reduce deflection and whipping.
- For axes longer than ~1000–1200 mm, or heavier gantries, SFU2005 often becomes a safer choice if you want to keep speed and vibration under control.

Even on a light machine, a 1 m long rotating SFU1204 at high speed can whip badly. If you need long travel at high speed, move up in diameter or reduce rotational speed.

2. Lead 4 mm vs 5 mm: resolution, thrust and speed

Lead determines how far the nut travels per motor revolution:

SFU1204 – 4 mm lead
- 1 motor rev → 4 mm travel.
- Acts like built-in reduction:
  - Higher thrust and finer resolution for the same motor torque and microstepping.
  - But lower linear speed at the same RPM.
SFU1605 / SFU2005 – 5 mm lead
- 1 rev → 5 mm travel.
- An “industry standard" lead, easy for step/mm calculations.
- Allows higher linear speed at the same motor RPM, with slightly lower thrust and resolution than a 4 mm lead.

3. End support units (BK10/BF10 vs BK12/BF12 etc.)

Each screw size is usually paired with matching support units:

SFU1204 → BK10 / BF10
- Smaller bearings, suitable for lighter loads and shorter screws.
- For strong cutting or long travel, the BK10 fixed bearing can become a stiffness bottleneck before the screw itself.
SFU1605 → BK12 / BF12
- Very common industrial combination with larger fixed bearings and better rigidity.
- A solid choice for many desktop and 6040-style CNC machines.
SFU2005 → BK15 / BF15 or similar
- Even larger bearings and housing, designed to support higher loads and longer screws.

4. Rotational inertia: the hidden cost of “going bigger"

Screw inertia grows roughly with the diameter to the fourth power. A 20 mm screw can have several times the rotational inertia of a 16 mm screw of similar length. This means:

It needs more motor torque to accelerate and decelerate.
If you pair SFU2005 with a small stepper (for example a modest NEMA23) and try aggressive acceleration, you may see stalling or missed steps.

Whenever you choose SFU2005 (or larger), plan on using a stronger motor and drive (larger NEMA frame or servo), or use more conservative acceleration profiles.

5. Practical selection guidelines

Putting it together:

Choose SFU1204 when:
- Stroke is relatively short (around ≤ 400–600 mm),
- The axis is light and you value fine resolution and higher thrust at modest speeds,
- You are okay with BK10/BF10-level support capacity.
Choose SFU1605 when:
- You have a desktop CNC or 6040-class machine with travel around 400–1000 mm,
- You want a good balance of stiffness, speed, cost and reasonable inertia,
- You prefer robust, standard BK12/BF12 supports.
- This is the best starting point for most DIY and light industrial X/Y axes.
Choose SFU2005 when:
- Travel is ≥ 1000–1200 mm or the moving mass is clearly heavier,
- You are concerned about deflection and whipping at your target speeds,
- You are ready to design around bigger supports and higher motor torque to handle the increased rotational inertia.

For any important axis, it is still recommended to check the calculated critical speed and bearing load ratings instead of relying only on rules of thumb.

Q What is the difference between C7, C5 and C3 ball screw grades, and how should I choose?

C7, C5 and C3 are accuracy grades that define the lead error of a ball screw over a reference length. They do not directly define backlash. You can think of them like this:

1. C7 – Rolled grade, cost-effective accuracy

Process: Usually cold-rolled (rolled ball screw), lowest cost.
Lead accuracy: Typical tolerance is around ±0.05 mm per 300 mm travel (exact value depends on the standard and manufacturer).
Best suited for:
- 3D printers and hobby CNC
- Wood routers and basic engraving machines
- Handling modules, packaging machines and general automation where ±0.1–0.2 mm over the stroke is acceptable
Backlash note: Most C7 screws are supplied with a standard single nut that has some clearance.
If you require minimal backlash, you must choose a preloaded nut (oversized balls) or a double-nut design. Upgrading from C7 to C5 alone does not magically remove backlash.

2. C5 – Higher accuracy, typically ground (but C5 rolled exists)

Process: Traditionally, C5 is ground and significantly more expensive than C7 (often 3–5*).
Lead accuracy: Around ±0.018 mm per 300 mm travel (depending on standard/manufacturer).
Best suited for:
- Industrial CNC milling and turning machines
- Precision positioning axes in automation
- Applications that need tighter dimensional control over long strokes
Benefits:
- Better lead accuracy and repeatability
- Smoother running and lower noise compared to many rolled C7 products
Middle option: There are now C5 rolled ball screws on the market which offer better accuracy than standard C7 with a lower price than fully ground C5. For many machines, this is a good compromise between cost and performance.

3. C3 – High precision ground grade

Process: High-end ground ball screws, often with strict temperature control during manufacturing.
Lead accuracy: Around ±0.008 mm per 300 mm.
Best suited for:
- Jig grinders and high precision grinding machines
- Semiconductor equipment
- Coordinate measuring machines (CMM) and ultra-precision positioning systems

Critical tips: accuracy grade vs backlash, and long travel axes

Accuracy grade ≠ zero backlash
- C5 tells you the screw “walks the right distance" (lead accuracy).
- It does not guarantee that there is no axial play when you reverse direction.
- If you care about lost motion / backlash, you must specify a preloaded nut or double-nut solution. This is often more important for feel and positioning at reversal than the difference between C7 and C5 grades.
Long travel and cumulative error
- The often-quoted accuracy values (e.g. per 300 mm) are per segment, not for the entire axis.
- On a 1 m or longer axis, C7 lead error can accumulate to several tenths of a millimeter.
- If your axis is long and you need parts to fit accurately over that whole length, you should seriously consider C5 (or at least a higher-accuracy rolled option) even if you don’t need the absolute smoothness of ground C5.
How to choose in practice
- C7 rolled – when budget is limited and your acceptable error is in the ±0.1–0.2 mm range over the stroke. Combine it with a preloaded nut if you want less backlash.
- C5 (ground or high-accuracy rolled) – when you build serious CNC equipment or long-travel axes that need better dimensional accuracy and smoother motion.
- C3 ground – only when you clearly need high-end precision and your machine structure, feedback system and temperature control can actually take advantage of that grade.

Q What is the difference between Z0, ZA and ZB preload, and which level should I choose for my axis?

Z0, ZA and ZB are different preload levels for linear guide blocks:

Z0 preload – very light preload or almost zero clearance
- Low friction, easy to move
- Suitable for light-load, high-speed axes and general automation
ZA preload – light to medium preload
- Higher rigidity than Z0 but still reasonable friction and heat
- Commonly used on machining center X/Y axes and many CNC and industrial axes
ZB preload – heavy preload
- Highest rigidity and the least elastic deformation
- Used for very heavy cutting heads, boring mills or axes where deflection must be minimal

However, there are some critical points you must consider before choosing a high preload, especially ZB:

Installation flatness and parallelism
High preload (especially ZB) makes the guideway much more sensitive to mounting errors.
- If the base surfaces are not precision-machined and properly ground, the rail cannot “flex” to absorb the error.
- The block will run very heavy, generate heat and may wear the raceways quickly or even seize.

Q For compact axes, how do I choose between narrow MGN and wide MGW miniature guides?

Narrow MGN guides (for example MGN9H, MGN12H) and wide MGW guides (such as MGW9, MGW12) are both miniature profile rails, but they optimize different directions of moment load:

MGN-H (long block)
The “H" long block version mainly increases the pitching and yawing moment capacity (Mp and My):
- Pitching: front–back nose diving of a cantilever (up/down at the end)
- Yawing: twisting around a vertical axis
  A longer block gives a longer distance between the rolling elements along the rail, which helps when the load tries to tip the carriage forward or backward along the travel direction.
MGW (wide block and rail)
The wide MGW series mainly increases the rolling moment capacity (Mr):
- Rolling: side-to-side tilting of a bed or arm (left/right roll)
  The wider base and block footprint make MGW much stronger against a load that tries to flip the carriage sideways, especially when you only have one rail supporting a bed or arm.

In practice:

If your main concern is a cantilever arm or tool head that “noses down" or “twists" along the travel direction, a long MGN-H block can already provide very good support.
If your main concern is a single-rail bed that wants to “roll" left/right, a wide MGW rail is usually the safer choice.

For many 3D printers, designers use MGN12H on X/Y carriages to control pitching and yawing, and choose MGW9/MGW12 under a single-rail bed where rolling is critical. The final decision should still be checked against the catalog moment ratings (Mp, My, Mr) for your load direction and mounting.

Q When should I choose a roller type series like RG or QR instead of a ball type like HG?

Roller type guides like RG or QR use cylindrical rollers instead of balls. Compared with ball-type HG guides of the same size, they offer:

Much higher rigidity and load ratings (especially for moment loads)
Better resistance to vibration and deformation in heavy cutting

They are a strong choice for very heavy cutting, high column machines, boring mills and axes where even small deflection is not acceptable.

However, there are important trade-offs you must consider:

Maximum speed and heat
Roller guides have line contact and higher friction than ball guides. This means:
- Lower maximum recommended speed
- More heat generation at high speeds
  On very fast automation axes (high m/min), using roller guides without checking the catalog limits can cause overheating and grease breakdown.
Installation surface flatness
Because roller guides have very high rigidity and very little self-alignment capability, they are more sensitive to base flatness and parallelism.
- If the mounting surfaces are not machined accurately, the preload can become too high locally.
- The axis may feel very heavy, wear quickly or even bind.
  With HG ball guides, minor errors are sometimes absorbed; with RG/QR you must have a better-machined base.
Required driving torque
Higher friction also means higher motor torque is needed:
- Starting torque and running torque are both higher than with HG
- If you upgrade from HG to RG/QR without adjusting the motor and drive, you may see overload alarms or following error.

In summary, roller guides are recommended only when you clearly need very high rigidity and load capacity, and your machine can support higher base machining accuracy, lower speed or higher motor torque. For many axes, a well-selected HG series is still the more balanced and economical choice.

Q HG vs EG Linear Guides: Profile, High Rigidity and Mounting Differences

HG is a heavy-duty, high-profile series with high rigidity, mainly used on CNC machine tools and rigid gantry axes. EG is a low-profile, lighter series that keeps reasonable rigidity but reduces overall height and weight, making it better for automation modules, pick-and-place units and compact machines.

In addition to profile and rigidity, the rail width and mounting hole pitch of HG and EG are not always the same, so they are usually not drop-in interchangeable. If you plan to switch from HG to EG or vice versa on an existing machine, you must check the rail width, hole spacing and counterbore dimensions carefully against your base.

Although EG is overall lower in rigidity than HG in pure vertical load, some EG variants have relatively wide rails and blocks, so their moment load ratings around roll/pitch/yaw are still quite good. For axes where overturning moment is more critical than extreme vertical rigidity, a properly sized EG guide can still be a very practical choice.

Q Linear Guide FAQ: Interchangeable Types, HIWIN-Compatible Replacements and TranzBrillix Solutions

This FAQ is designed for users who are looking for linear guide manufacturers, need to repair old machines, or want to replace obsolete HIWIN linear guides with compatible TranzBrillix solutions.

Q1: What is an interchangeable linear guide?

An interchangeable linear guide uses standardized dimensions so that blocks can be exchanged on any rail of the same size and accuracy class. In most cases, you can replace only the block while keeping the existing rail, as long as the mounting dimensions and preload class match your original design.

Q2: What is a non-interchangeable (matched set) linear guide?

A non-interchangeable, or matched-set, linear guide is factory paired: each block and rail are measured and supplied as a set. They are not intended to be mixed with other rails or blocks. When this type becomes obsolete, maintenance usually requires a full set replacement, including rail and blocks, rather than changing the block alone.

Q3: How do I know whether I can replace only the block or nut?

First, confirm whether your existing system is interchangeable or non-interchangeable. Then check key dimensions: rail width, mounting hole spacing, rail height, block mounting pattern, and for ball screws, shaft diameter and lead. If the system is interchangeable and a new series shares the same mounting dimensions, you can often replace only the block or ball nut. If it is a non-interchangeable matched set that is fully obsolete, a complete replacement kit is the safer solution.

Q4: Can TranzBrillix linear guides replace HIWIN linear guides?

In many popular sizes, TranzBrillix linear guides are designed around main HIWIN mounting dimensions and can be used as HIWIN-compatible replacements. For some projects we can also evaluate mixed solutions, such as a TranzBrillix block on an existing HIWIN rail, provided that the dimensions, preload and running performance are carefully verified before use.

Q5: What if my HIWIN linear guide is non-interchangeable and discontinued?

When a non-interchangeable HIWIN model is completely discontinued, the most reliable approach is a full set replacement. As a linear guide manufacturer, TranzBrillix can engineer a complete compatible kit based on your original installation: rail length, stroke, mounting hole pattern, overall height and load requirements. The goal is to keep your machine layout as close as possible while restoring or improving accuracy and rigidity.

Q6: What information should I prepare before asking for a replacement proposal?

To speed up the engineering review, please prepare clear photos of the existing rail and block (including nameplates), basic dimensions (rail width, hole spacing, stroke and total length), and any available drawings or sketches. With this information, TranzBrillix can quickly confirm whether an interchangeable repair is possible or whether a full HIWIN-compatible replacement set is the better option.

Q Miniature Linear Guide Block Feels Loose? Read This Before Calling It a Defect

When customers buy miniature linear guides (such as MGN series) for the first time, one of the most common concerns is: “The block feels loose on the rail, is the guide out of tolerance?"

In many cases this feeling comes from how the guide is being checked, not from a real quality problem. This article explains what “very light preload" means, why you may still feel some movement, and when you should consider a different preload level.

1. Typical Complaint Scenario

A frequent message from end users looks like this:

“The block has obvious play on the rail."
“When I rock the block by hand, I can feel clearance."

This feedback often appears after the customer receives a miniature guide like MGN12H1R300Z0C and tests it by hand, before installation on the machine.

2. Understanding the Model and Preload Code

Take the model MGN12H1R300Z0C as an example. It can be broken down as follows:

MGN12H – 12 mm miniature linear guide, long type block type
1R300 – 1 pc rail of 300 mm length
Z0 – very light preload (almost zero clearance)
C – normal accuracy grade
Material: Alloy steel

A common misunderstanding is: “Z0 means it is a loose, clearance type, that’s why it feels shaky."

In reality it is the opposite: Z0 is a very light preload level, designed to be close to zero clearance while still keeping friction low and installation more forgiving than heavy preload types.

3. Why Can You Still Feel Movement When You Check by Hand?

If the block is moved by hand in free condition (rail not mounted, no table attached), some movement can usually be felt even with a very light preload.

3.1 Rail Not Mounted, Block Rocked by Hand

In many cases the user:

holds the rail in the air or on a soft surface,
grips one corner of the block with fingers,
rocks the block up/down or left/right with some force.

The motion observed here is mainly:

elastic deformation of balls and raceways under side load, and
small angular deflection in the rail, block and even the operator’s hand.

Visually it can look like a “gap", but in most cases it is simply elastic movement multiplied by the leverage effect, not a large free clearance.

3.2 Z0 Is “Very Light Preload", Not Heavy Preload

The intention of the Z0 preload level is to:

provide basic stiffness and positional accuracy,
keep running resistance low,
offer better tolerance to minor mounting errors.

Therefore it will never feel as “rock solid and locked" as a heavy preloaded guide. If someone expects absolutely no perceptible motion in any direction, even a small elastic movement may be judged as a defect, although it is normal for Z0.

4. When Should You Treat It as a Real Quality Issue?

While some movement by hand is normal for a very light preload, there are cases where further inspection is necessary:

Rail and block are not originally matched
Mixed sets, wrong models or random swapping between rails and blocks can completely change the preload condition.
The block has been removed from the rail
If the block has been taken off the rail and reinstalled, balls may be lost, contaminated or misaligned, resulting in true clearance.
Visible damage or deformation on raceways
Impact, dents, burrs or serious corrosion on the raceway can affect contact and preload.
Excessive measured play after proper mounting
Normal Z0 preload may show minimal elastic movement. If side play is clearly visible and can be measured as large (for example clearly above the expected tolerance) even after correct installation, the guide should be evaluated as a potential defect.

5. What If You Really Need a “Zero-Play" Feeling?

Some applications require a block that feels absolutely tight, with no noticeable play in any direction when installed. In such cases, a higher preload level, such as Z1 preload, can be considered.

Compared with Z0, a Z1 preloaded guide will:

feel clearly tighter when moved by hand,
offer higher stiffness and less elastic movement under load,
provide a feeling much closer to “zero play".

However, this comes with an important requirement: the mounting base must be machined very flat and parallel. With higher preload:

any deviation in flatness or parallelism is magnified,
binding can occur at certain positions along the stroke,
abnormal noise and local wear become more likely.

In short:

For maximum rigidity and almost no perceptible play → consider a Z1 preloaded type and ensure a high-quality mounting surface.
For smoother motion and better tolerance to mounting errors → a Z0 very light preload miniature guide is often the more practical choice.

6. Recommended Check Steps for End Users

To evaluate whether the observed movement is normal or not, the guide should always be checked in a condition close to real use. A simple procedure is:

Fix the rail on the machine base
Mount the rail on a rigid, machined reference surface and tighten all screws to the specified torque.
Connect the block to the table or carriage
Install the table, carriage or working platform on the block as in actual operation.
Move the axis through the normal stroke
Manually move the axis and feel for binding, roughness or abnormal noise throughout the stroke.
Measure side play if necessary
If higher precision is required, use a dial indicator to measure side movement at the table under specified load.
Record and share data
If there is still clear free play after proper mounting, record a short video and the measurement results, then send them to the supplier for evaluation.

7. FAQ: Miniature Linear Guide Block Play

Q1: My miniature guide block feels loose on the rail. Is it defective?

Not necessarily. First check the model and preload code. For types with Z0 very light preload, the block is designed to have almost zero clearance, but some elastic movement can still be felt when the rail is not mounted and the block is rocked by hand. This is normal for Z0. Always test again after the rail is mounted on a flat base and the block is connected to the table. If there is still obvious free play, provide video and measurement data for further evaluation.

Q2: I want absolutely no noticeable play at all. Is that possible?

Yes. A higher preload level such as Z1 preload can provide higher stiffness and a feeling very close to zero play when correctly installed. However, it requires a very flat and accurate mounting surface. If the base is not machined well enough, higher preload may cause binding, noise or accelerated wear.

Q3: How should I specify the preload level when placing an order?

You can add the preload code (for example, Z0 or Z1) at the end of the model, or clearly state in your inquiry that you require a very light preload or a higher, near-zero-play preload. Based on your application and mounting conditions, the supplier can then recommend a suitable preload and accuracy grade for your miniature linear guide.

Q After-Sales FAQ for Linear Guides and Ball Screws

Q1: What is the fastest way to confirm dimensions or drawings before ordering?

For standard models (such as MGN and HGR series), you can directly check dimension tables, mounting diagrams and CAD downloads on the product page. There is no need to wait for live support. If you need a customized solution (non-standard length, special hole pattern, etc.), simply note “drawing required” and share your stroke, lead and mounting space. We normally reply within 4 working hours.

Q2: I think there is a quality issue. What information should I prepare?

To start the process quickly, please prepare:

Your order number, or purchase date plus company / receiver name;
On-site photos or videos showing the installation area and the observed issue (noise, scratches, rust, misalignment, etc.);
Your expected solution (replacement, reshipment or refund).

We will forward this package to our technical team and provide a same-day solution once a product-related issue is confirmed.

Q3: Who pays the freight if a quality issue is confirmed?

If the problem is confirmed to be product-related, we cover the cross-border freight for returns or replacements. Depending on the case, we will arrange replacement, reshipment or refund. You will not be asked to pay extra for a quality issue.

Q4: Can you help if I selected the wrong model myself?

Yes. We will still try to minimize your loss. However, for returns or exchanges due to wrong selection or unclear specifications, freight and related costs need to be covered by the buyer. For customized or machined parts, feasibility and possible solutions will be discussed case by case.

Q5: Do I need to provide all parameters again if I want to reorder the same blocks or accessories?

No. You only need to provide your previous order number or shipping details. We will retrieve your purchase record from our system and match exactly the same linear guides, blocks or end caps, so you do not risk ordering an incompatible model.

Q6: Will time zone differences slow down after-sales communication?

We plan our workload with time zones in mind. Our standard commitment is to reply to after-sales questions within 4 working hours and provide an initial plan within 12 hours. Requests submitted during public holidays will be handled with priority once we are back.

Q7: Can you provide an after-sales guide that we can print and use on site?

Yes. If you share your main purchased models, machine names and typical spare parts, we can prepare a customized After-Sales Quick Reference Card for you. It includes model lists, drawing links, contact details and the key information required when reordering spare blocks or accessories.

Q Bulk Order & Annual Project RFQ

Bulk Order & Annual Project RFQ

Use this RFQ page for large-volume orders, annual projects and long-term OEM cooperation. We help you plan cost, lead time and stock levels for linear guides, ball screws, bearings and related parts throughout the life of your project.

When to Use This RFQ

You have repeat orders for the same models across the year.
You are an OEM or system integrator with stable annual demand.
You want to optimize price, delivery and safety stock together.
You need a framework or blanket order with scheduled releases.

What Information Helps Us Quote Faster

Product list (models, specifications, technical requirements).
Estimated annual volume and order frequency.
Target price level or current reference price (if any).
Planned project lifetime and markets served.
Any special contractual, packaging or labeling requirements.

Recommended RFQ Form Fields

Company Name *
Country / Region *
Contact Name *
Email *
WhatsApp / WeChat / Phone (optional)
Product List with Annual Volume
Expected Order Frequency (monthly / quarterly / yearly)
Target Price or Budget (optional)
Project Lifetime & Main Application
Logistics & Packaging Preferences
File Upload (BOM, agreement draft, forecast)

Q Sample & Small Batch RFQ

Sample & Small Batch RFQ

Use this RFQ page if you are testing a new project, building prototypes or placing your first trial order. We support low MOQ for linear guides, ball screws, bearings and related components, helping you validate the design before mass production.

When to Use This RFQ

You are developing a new machine or automation module and need trial parts.
You want to verify compatibility with existing brands or equipment.
You prefer to start with a small batch to test quality and delivery.
You need a mix of different sizes and models in one shipment.

What Information Helps Us Quote Faster

Product types required (guides, screws, bearings, shafts, support units, etc.).
Exact models or equivalent cross-reference requirements.
Quantity for each model in the sample or small batch.
Target testing schedule and when you plan to move to mass production.
Any special packaging or labeling requests.

Recommended RFQ Form Fields

Company Name *
Country / Region *
Contact Name *
Email *
WhatsApp / WeChat / Phone (optional)
Product List & Required Quantities
Project Stage (prototype / pilot line / customer trial)
Target Date for Receiving Samples
Expected Volume After Approval
Application & Special Requirements
File Upload (BOM, drawing, photos)

Q Brand Replacement RFQ – HIWIN / THK / PMI / CPC

Brand Replacement RFQ – HIWIN / THK / PMI / CPC & More

Use this RFQ page if you want to replace existing branded linear guides, ball screws or related components while keeping the same mounting dimensions and similar performance.

When to Use This RFQ

You have HIWIN / THK / PMI / CPC parts installed and need compatible replacements.
You want to reduce cost or shorten lead time without changing your machine design.
You only have old parts on hand and need us to cross-check model numbers.
Your machine is discontinued and the original brand is hard to source.

What Information Helps Us Quote Faster

Original brand and complete model number (as shown on the part or documentation).
Clear photos of the rail, carriage, ball screw or bearing, including nameplates.
Dimensions or drawings if model number is not fully readable.
Whether you require 100% same dimensions or accept minor changes.
Required quantity and whether this is a one-time replacement or long-term demand.

Recommended RFQ Form Fields

Company Name *
Country / Region *
Contact Name *
Email *
WhatsApp / WeChat / Phone (optional)
Original Brand (HIWIN / THK / PMI / CPC / Other)
Original Model Number (exact code)
Can You Accept Alternative Brands? (Yes / No / Depends on price & lead time)
Critical Dimensions or Tolerances (if known)
Required Quantity & Expected Schedule
File Upload (photos of old parts, drawings, BOM)

Q Sample & Small Batch RFQ

Sample & Small Batch RFQ

When to Use This RFQ

You are developing a new machine or automation module and need trial parts.
You want to verify compatibility with existing brands or equipment.
You prefer to start with a small batch to test quality and delivery.
You need a mix of different sizes and models in one shipment.

What Information Helps Us Quote Faster

Product types required (guides, screws, bearings, shafts, support units, etc.).
Exact models or equivalent cross-reference requirements.
Quantity for each model in the sample or small batch.
Target testing schedule and when you plan to move to mass production.
Any special packaging or labeling requests.

Recommended RFQ Form Fields

Company Name *
Country / Region *
Contact Name *
Email *
WhatsApp / WeChat / Phone (optional)
Product List & Required Quantities
Project Stage (prototype / pilot line / customer trial)
Target Date for Receiving Samples
Expected Volume After Approval
Application & Special Requirements
File Upload (BOM, drawing, photos)

Q Custom Machining & Non-Standard Design RFQ

Custom Machining & Non-Standard Design RFQ

Use this RFQ page when your project cannot be solved by standard catalog parts. We support customized linear guides, ball screws, housings and other precision components according to your drawings and specifications.

When to Use This RFQ

You need non-standard rail hole patterns or special end shapes.
You require modified carriages, wider or shorter blocks or special sealing concepts.
You want ball screw ends machined to fit a unique support or coupling design.
You need custom housings, bases or brackets for complete linear modules.

What Information Helps Us Quote Faster

2D/3D drawings (PDF, DWG, STEP) with clear tolerances and material requirements.
Quantity per batch and estimated annual volume.
Expected accuracy, surface roughness and heat treatment requirements.
Any reference to existing standard parts or previous solutions.
Special testing or inspection requirements (if any).

Recommended RFQ Form Fields

Company Name *
Country / Region *
Contact Name *
Email *
WhatsApp / WeChat / Phone (optional)
Project Overview
Material, Heat Treatment & Surface Requirements
Target Accuracy & Function
Batch Quantity & Annual Volume
Preferred Delivery Time
File Upload (2D & 3D drawings, specs)

Q Stainless & Anti-Corrosion Linear Motion RFQ

Stainless & Anti-Corrosion Linear Motion RFQ

Use this RFQ page if your project requires stainless steel or special anti-corrosion treatment for linear guides, ball screws, shafts or bearings. Typical applications include food processing, medical equipment, chemical environments and outdoor installations.

When to Use This RFQ

You need stainless linear guides or ball screws for wash-down or high-humidity environments.
You require special coatings (black chrome, nickel plating, etc.) for corrosion protection.
Your equipment must comply with food-grade or cleanroom requirements.
You need advice on material selection versus cost and delivery time.

What Information Helps Us Quote Faster

Which parts should be stainless (rails, blocks, screws, nuts, shafts, housings).
Preferred material grade (e.g. 304, 316, stainless tool steel, etc., if known).
Target environment (water, steam, chemical exposure, cleaning agents).
Expected lifetime and maintenance conditions.
Whether you accept carbon steel with advanced surface treatment as an alternative.

Recommended RFQ Form Fields

Company Name *
Country / Region *
Contact Name *
Email *
WhatsApp / WeChat / Phone (optional)
Required Products (guides / screws / shafts / bearings / housings)
Stainless Grade or Coating Preference
Operating Environment & Cleaning Process
Any Industry Standard or Certification Requirements
Application Description
File Upload (drawing, specification, project documents)

Q Support Unit & Nut Housing RFQ

Support Unit & Nut Housing RFQ

Use this RFQ page when you need ball screw support units and nut housings, either in standard BK/BF, FK/FF, EK/EF formats or in custom-designed versions to fit your machine.

When to Use This RFQ

You already have ball screws and now need matching support units.
You want compact nut housings for limited installation space.
You need to replace worn support units from existing equipment.
You require non-standard mounting patterns or special housing materials.

What Information Helps Us Quote Faster

Ball screw diameter and existing support unit type (if any).
Required support style (fixed end / supported end / both).
Nut outer dimensions and preferred housing style (round flange, square, compact, etc.).
Mounting pattern, bolt size and available installation space.
Material preference (aluminum, carbon steel, ductile iron, etc.).

Recommended RFQ Form Fields

Company Name *
Country / Region *
Contact Name *
Email *
WhatsApp / WeChat / Phone (optional)
Ball Screw Diameter & Type
Support Unit Type (BK/BF, FK/FF, EK/EF, others)
Nut Housing Type (round flange, square, custom)
Mounting Pattern & Space Constraints
Material Requirements
Application & Special Notes
File Upload (drawing, old part photos)

Q Linear Bearing & Shaft RFQ

Linear Bearing & Shaft RFQ

Use this RFQ page for LM/LME linear bearings, open and extended types, pillow-block housings and hardened shafts. We can provide bearings alone, shafts alone or complete kits matched to your required size and stroke.

When to Use This RFQ

You need LM/LME series bearings for existing or new linear shafts.
You require hardened and ground shafts with specific tolerance and surface roughness.
You are looking for pillow-block style bearings for quick installation.
You want bearing + shaft sets cut to length and ready to install.

What Information Helps Us Quote Faster

Bearing type and size (e.g. LM20UU, LME25UU, open/closed, extended or standard).
Shaft diameter, tolerance and required surface quality (if known).
Shaft length and quantity for each axis.
Whether you need housings (pillow-block units) or bare bearings.
Load, stroke, speed and working environment (dust, coolant, moisture, etc.).

Recommended RFQ Form Fields

Company Name *
Country / Region *
Contact Name *
Email *
WhatsApp / WeChat / Phone (optional)
Bearing Type (LM / LME / Open / Extended / Pillow-block)
Bearing Size (e.g. 20, 25, 30 mm)
Shaft Diameter & Length per Piece
Shaft Tolerance & Hardness (if required)
Set or Separate (bearing only / shaft only / complete kit)
Application & Environment
File Upload (drawing, photos)

Q Linear Guide RFQ – Standard & Micro Series

Linear Guide RFQ – Micro, Standard & Wide Series

Use this RFQ page if you need quotations for linear guides and carriages, including micro series MGN/MGW, low and high profile EG/HG rails, roller-type RG and wide WE series. We support both new projects and replacement of existing rails from major international brands.

When to Use This RFQ

You need micro linear guides (MGN/MGW) for compact equipment or small automation modules.
You require standard EG/HG/RG/WE rails for CNC machines, automation lines or positioning stages.
You want to replace existing HIWIN / THK / PMI / CPC linear guides with compatible alternatives.
You need custom rail lengths with one or more carriages per rail.

What Information Helps Us Quote Faster

Series and size (e.g. MGN12, MGW9, EG15, HG20, RG25, WE21, etc.).
Required number of rails and carriages per rail.
Rail length for each set (e.g. 2 × 800 mm, 1 × 1200 mm, etc.).
Accuracy / preload (if any) and whether you need stainless or anti-corrosion versions.
Brand / model to replace, or attached drawing/photos of existing rails and blocks.
Application overview (machine type, load, speed, environment).

Recommended RFQ Form Fields

Company Name *
Country / Region *
Contact Name *
Email *
WhatsApp / WeChat / Phone (optional)
Product Type: Linear guide rail / Carriage only / Rail + Carriage set
Series & Size (MGN, MGW, EG, HG, RG, WE and width)
Rail Length & Quantity (please list each set)
Number of Carriages per Rail
Accuracy / Preload / Stainless or Coating Requirements
Brand / Model to Replace (if any)
Application & Special Notes (free text)
File Upload (drawing, photo, BOM)

Q Frequently Asked Questions for Linear Motion Products

Frequently Asked Questions

This FAQ covers common questions about linear guides, ball screws, linear bearings, support units and ball screw nut housings, including selection, customization, machining, assembly, lead time, packaging and shipment.

1 Product Range & Compatibility ▸

Q1. What linear motion products do you mainly supply?

Our core portfolio covers the complete linear motion chain, including:

Linear guides: micro guideways (MGN/MGW series), low-profile and high-profile guides (EG/HG series), roller-type guides (RG series), wide-type guides (WE series), etc.
Ball screws: C7 rolled ball screws and C5/C3 precision ground ball screws (lead accuracy based on JIS standards, defined by four characteristic parameters: E, e, e300 and e2π), with customized end machining available.
Linear bearings: LM/LME standard series, extended type, open type and pillow-block type linear bearings.
Support units: complete series of BK/BF, FK/FF, EK/EF standard support units.
Ball screw nuts & housings: round-flange, square type, compact type and double-nut preloaded structures.

Q2. Can your linear guides and ball screws replace foreign brands?

Yes. We can provide one-stop replacement solutions:

Compatibility: dimensional compatibility with major brands such as HIWIN, THK, PMI, CPC, etc., for the same model series.
Selection method: precise matching according to the brand/model or dimensional drawings provided by customers.
Key verification: official comparison tables or measured drawings to confirm critical dimensions such as bolt pitch, height, width and raceway center distances.
Non-standard retrofits: for non-standard original parts, we can customize according to the actual mounting dimensions of your machine.

2 Selection & Customization ▸

Q3. What basic information should I provide before placing an order?

To ensure accurate delivery, please provide at least:

Product category: linear guide/slider, ball screw, linear bearing, support unit or nut housing.
Model & size: e.g. MGN12C, SFU1605, LM20UU, BK12, etc.
Dimensional requirements: total length of guide, effective stroke/overall length of ball screw, etc.
Accuracy grade: e.g. guideway C/H/P, ball screw C7/C5, etc.
Working conditions: load, speed, environment (anti-rust, dust protection, etc.).
Purchasing plan: quantity and whether it is a one-time or long-term order.

Q4. Can you fully customize according to my drawings?

Yes, we support full dimensional customization. The typical workflow is:

Drawing formats: we accept 2D/3D drawings (PDF/DWG/STEP) and can do tooling, machining or design modification based on them.
Customization scope: non-standard bolt pitch, special slider shapes, special flanges, special keyways and other structures.
Drawing requirements: material, heat-treatment requirements, tolerances on critical dimensions, surface treatment and quantity must be clearly marked.
Co-design: if the information is incomplete, our engineers can help refine the design before final confirmation for production.

Q5. How do you customize non-standard length linear guides?

Guides can be precisely cut to length with the following options:

Cutting mode: (1) single piece to a specific length (e.g. 750 mm, 820 mm); (2) multiple sections for butt-joint usage (e.g. 2 * 1200 mm).
Edge finishing: all cut ends are chamfered and deburred to avoid damage to carriages and seals.
Positioning marks: mounting reference surfaces are re-marked after cutting to keep installation accuracy.
Engineering advice: for high-precision or long-travel applications, we can provide paired processing or segmented butt-joint solutions.

Q6. Can you customize ball screw end machining?

Yes, we offer fully customized end machining:

Machining range: shaft diameter, shoulders, snap-ring grooves, keyways and other end features according to your drawings.
Matching service: keyways, keys, lock-nut threads and circlip grooves can be machined at the same time to fit support units directly.
Selection convenience: standard end machining reference drawings are available for direct selection or minor modification.
Accuracy assurance: dynamic balance is checked after machining for stable high-speed operation.

Q7. Can linear bearings and support units be made in non-standard versions?

Yes, we support non-standard designs in the following scope:

Housing design: customized housings according to bolt pattern and available installation space.
Material options: aluminum alloy, carbon steel, ductile cast iron and others.
Mounting styles: bottom mounting, side mounting, clamp-plate mounting and more.
Batch notes: for large volumes, tooling cost and lead time need to be confirmed in advance.

Q8. How can I choose the right model for my equipment?

We can support multi-dimensional selection based on:

Load: calculate equivalent load and keep a safety factor of 1.5–2.0.
Mounting: choose flange or block-type carriages, open or closed housings, etc.
Space: determine guide/screw size and installation height according to your layout.
Accuracy: select standard or high-precision products based on speed and accuracy requirements.
Engineering support: you can provide equipment photos or old part numbers for our engineers to cross-check.

3 Machining Capability & Technical Details ▸

Q9. What level of machining accuracy can you achieve for linear guides?

Our typical accuracy indicators (adjustable by series and grade) are:

Straightness: up to ±0.01 mm/m for precision-grade products.
End accuracy: cut end squareness meets the requirement for smooth carriage travel.
Surface quality: ground surfaces can reach Ra 0.2–0.4 µm.
Inspection support: straightness and parallelism reports can be provided upon request.

Q10. How do you control cutting length tolerance for guides?

Using CNC cutting and finishing, we control:

Standard tolerance: ±0.5 mm.
Tight tolerance: up to ±0.2 mm or better when specified before ordering.
Batch control: for multiple pieces in one batch, same-length guides can be paired within ≤0.2 mm difference.

Q11. What tolerances can you meet on ball screw end machining?

In line with relevant GB/T standards, our key tolerances are:

Shaft diameter: normally h7, and up to h6 for precision requirements.
Shoulder run-out: typically controlled within 0.01–0.02 mm (depending on size and grade).
End squareness: meets the requirement of support units to ensure axial run-out is within spec.
Special cases: higher precision can be discussed in detail based on drawings.

Q12. What kinds of surface treatments can you offer?

We recommend surface treatments based on material and application:

Carbon steel: ground base + anti-rust oil, blackening, black chrome, nickel plating, etc.
Stainless steel: ground base + anti-rust oil and passivation.
Aluminum housings: natural or black anodizing.
Selection factors: corrosion resistance, appearance, cost and lead time are considered together.

Q13. Can you provide matching machined parts like bases or mounting plates?

Yes, we can supply associated machining services:

Machining scope: steel or aluminum base plates and brackets according to order requirements.
Drawing requirement: complete machining drawings and assembly notes are needed.
Delivery: matched parts can be packed and shipped together with guides and screws to reduce your assembly work.

4 Assembly & Installation ▸

Q14. How are guides and carriages paired before shipment?

We use in-house pairing and running-in processes:

Standard delivery: guides and the corresponding number of carriages are shipped as complete sets.
Precision assurance: multiple carriages on one rail are matched by smoothness and preload value.
Spare carriages: if you order spare carriages, pairing codes and instructions will be clearly marked on the packaging.

Q15. What are the key installation points for linear guides?

To ensure running accuracy and service life:

Reference surface: mounting surfaces should be milled or ground to ensure flatness.
Installation order: fix the reference-side rail first, then adjust the other rail for parallelism.
Fastening: tighten screws gradually in a criss-cross pattern to avoid rail distortion.
Verification: manually move the carriage along full stroke to check for any tight or binding points.

Q16. Can the carriage be removed from the rail?

We do not recommend removing carriages from rails by yourself:

Risk warning: improper removal may cause balls to fall out, affecting accuracy and service life.
Correct method: if removal is necessary, use a special mounting/dismounting rail or dummy rail.
After damage: if balls are lost or misaligned, the assembly should be returned for reassembly and calibration.

Q17. What should I pay attention to when assembling ball screws, support units and nut housings?

Follow these guidelines for stable transmission:

Fit: end shaft dimensions must match the bore of support units and bearings accurately.
Assembly order: insert the screw into the nut housing first, then assemble with the support unit to avoid ball loss.
Preload: adjust axial clearance and preload properly to avoid overheating (too tight) or vibration (too loose).
Safety: plan rotation direction and limit positions in advance to prevent overtravel or collision.

Q18. What are the key points for installing linear bearings?

Main installation requirements:

Housing fit: housing bore and bearing OD are usually H7/h6 interference or transition fits; use proper tools for pressing.
Shaft fit: shaft and linear bearing are typically G6/h6 fits to ensure sliding accuracy.
Open type: open bearings must be clamped together with shafts or guides to avoid over-deformation.
Shaft surface: shafts should be ground with no burrs, dents or other defects.

Q19. Are products pre-lubricated before shipment?

Yes, pre-lubrication is done at the factory:

Standard configuration: guide carriages, ball screw nuts and linear bearings are pre-filled with general-purpose lithium grease or dedicated guide grease.
Customized grease: we can fill specific grease brands/types according to your requirements.
Special cases: for long-distance sea shipment or long-term storage, extra anti-rust grease will be applied.

Q20. What should I do before assembly after receiving the goods?

We recommend the following steps:

Incoming inspection: check appearance, model and quantity against the packing list.
Cleaning: gently wipe away excess anti-rust oil with a clean cloth. Do not use strong solvents for aggressive cleaning.
Preparation: confirm the flatness and cleanliness of the mounting surfaces; remove dust and oil.
Lubrication check: check the pre-lubrication condition and replenish suitable grease or oil according to your application if necessary.

5 Quality & Inspection ▸

Q21. How do you ensure stable product quality?

We implement full-process quality control:

Raw material inspection: sampling checks on material grade, hardness and metallographic structure.
Process control: in-process monitoring on grinding, rolling, lapping and other critical operations.
Finished inspection: full or sampling inspection on dimensions, straightness, parallelism and radial run-out.
Third-party support: third-party inspection reports can be provided if required.

Q22. Can you provide samples for testing?

Yes, we support sample verification:

Sample types: short guides, short ball screws, single carriages, linear bearings, etc.
Testing purpose: machine trial installation, performance verification and parameter validation.
Batch consistency: after samples are approved, batch production will follow the same process and parameters.

Q23. What if the delivered products do not meet my expectations?

We follow a clear problem-handling process:

Feedback: please provide photos, videos, measurement data and installation details as soon as possible.
Root cause analysis: we will work with you to identify whether the issue is due to transportation, installation, selection or product quality.
Solutions: if it is confirmed as a product quality issue, we will offer repair, replacement or agreed compensation.

6 Lead Time & Minimum Order Quantity ▸

Q24. What is your typical lead time for standard products?

Lead time depends on product type and process complexity:

Stock items: usually shipped within 3–7 working days (depending on quantity and packaging).
Simple cutting: about 7–10 working days.
Batch production: around 10–20 working days.
Complex non-standard parts: typically 15–30 working days, subject to the final process plan.

Q25. Do you have a minimum order quantity (MOQ)?

We support flexible purchasing:

Standard stock: single-piece and small-batch orders are both acceptable.
Non-standard parts: economic MOQ will be suggested to balance cost, to be agreed case by case.
Volume advantage: larger quantities can enjoy better pricing and priority in scheduling.

Q26. Can you expedite urgent orders?

Yes, we can offer expedite service where possible:

Feasibility: we will evaluate our production capacity and discuss an expedited plan.
Clear timing: please inform us of your required delivery date; we will confirm the shortest achievable lead time.
Alternative options: for very urgent needs, we may suggest stock alternatives or optimized technical solutions.

7 Packaging, Anti-Rust & Storage ▸

Q27. How are the products packed?

We use multi-layer protective packaging to suit different transport modes:

Single long items (guides/screws): anti-rust oil + VCI paper or vacuum bag + foam protection.
Small parts (carriages, bearings, support units): individual inner boxes + cushioning + outer carton.
Bulk/extra-long items: reinforced cartons or wooden cases suitable for sea/air freight.
Labeling: clear model and specification labels on the packaging for easy warehouse management.

Q28. How should I store the products for long periods?

Follow these storage guidelines to maintain performance:

Packaging: keep the original packaging sealed and intact.
Environment: store in a dry, ventilated area with relative humidity ≤ 60%.
Long-term storage (> 6 months): periodically flip and check the anti-rust condition.
Maintenance: if anti-rust oil dries out, replenish before further storage.

8 Logistics & Shipment ▸

Q29. What shipping methods do you offer?

We choose shipping methods based on volume, lead time and destination:

Express couriers: UPS/DHL/FedEx, etc., for small and urgent shipments.
Air freight: for medium-volume orders with higher time requirements.
Sea freight: for heavy and bulk shipments with clear cost advantages.
Final方案: determined by cargo size/weight, delivery deadline and destination country regulations.

Q30. How do you prevent deformation of long guides and long ball screws during transport?

We apply dedicated protection measures:

Reinforced packaging: strengthened wooden cases with multi-point internal supports.
Optimized support: multiple support points to avoid single-point loading and bending.
Extra-long items: can be supplied in sections with on-site butt-joint solutions.
Pre-shipment inspection: straightness is rechecked before packing to ensure initial accuracy.

Q31. Can you help provide customs clearance documents?

Yes, we offer full documentation support:

Basic documents: commercial invoice, packing list, certificate of origin, etc.
Special certificates: material certificates, heat-treatment certificates and other documents can be arranged if requested in advance.
Cooperation: we cooperate with you or your nominated forwarder to provide all data required for customs declaration.

9 After-Sales & Technical Support ▸

Q32. What technical support services do you provide?

We provide full life-cycle technical support:

Selection consultation: recommend optimal products based on your operating conditions.
Drawing service: help review or optimize end machining, housings and other design details.
Installation guidance: provide installation diagrams, operating procedures and maintenance advice.
Failure analysis: analyze on-site issues and propose practical improvement measures.

Q33. What is your warranty policy and coverage?

Our standard warranty policy is as follows:

Warranty period: 12 months after shipment for standard products (can be adjusted in contracts).
Coverage: manufacturing defects under proper installation and reasonable use will be repaired or replaced.
Exclusions: damages caused by improper assembly, incorrect lubrication, overloading or other human factors are not covered, but paid repair services are available.

Q34. How do you ensure consistency for long-term cooperation?

We build dedicated customer records to maintain batch consistency:

Record management: product models, batch numbers and special process requirements are documented.
Stable process: same process routes and supply chain are maintained to keep performance consistent.
Stock planning: for long-term projects, we can suggest annual or quarterly stocking plans to minimize lead time fluctuation.

HIWIN Linear Guide

Ball Screw

3D Printer Linear Guide

Linear Guide Rail

Ground Ball Screw

Linear Bearing

Ball Screw Support

Shaft Coupling

Ball Spline

Ball Nut Housing

Linear Shaft

Stainless Steel Shaft

Linear Shaft Supports

CNC Linear Guide

HIWIN Linear Guide

Ball Screw

3D Printer Linear Guide

Linear Guide Rail

Ground Ball Screw

Linear Bearing

Ball Screw Support

Shaft Coupling

Ball Spline

Ball Nut Housing

Linear Shaft

Stainless Steel Shaft

Linear Shaft Supports

CNC Linear Guide

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