RGH55HA Long Roller Linear Guide Block for Heavy Duty CNC Machines

RGH55HA is a 55-size high square roller linear guide block designed for heavy-load machine axes that require longer bearing support, higher moment-load resistance, and stronger rigidity than the standard CA block version. As the HA type in the RGH55 series, it uses a long square block structure with top mounting, making it suitable for larger moving tables, heavy machine frames, and axes where load distribution is more demanding.

With a dynamic load rating of 167.8 kN and a static load rating of 348 kN, RGH55HA provides a higher load margin than RGH55CA in the same 55-size rail platform. Its static rated moments are MR 11.15 kN·m, MP 10.25 kN·m, and MY 10.25 kN·m, giving the block stronger support for overhung loads, long moving assemblies, heavy cutting forces, and directional load changes.

For installation, RGH55HA uses M12 * 18 block mounting threads and should be matched with RGR55 roller guide rails. The matching RGR55 rail uses M14 * 45 mounting bolts, with a 60 mm rail hole pitch and 30 mm standard rail end distance. These details should be checked carefully when the guide block is used for replacement or when the existing machine base already has a fixed hole pattern.

Compared with RGH55CA, RGH55HA has a longer block body, higher load rating, and stronger moment-load support. It is generally selected when a 55-size axis needs better stability under large moving-table conditions, vertical loading, heavy machining, or repeated positioning under high working load.

To support accurate model selection, the code of RGH55HA roller linear guide block can be understood as follows:

RG: Roller type linear guideway series
H: Square block type
55: Size 55 series, with standard rail width WR = 53 mm
H: Super heavy load / long block type
A: Mounting from top

Common option suffixes:

Z0 / ZA / ZB: Light, medium, or heavy preload
H / P: High or precision grade

In practical selection, RGH55HA refers to a 55-size long square type roller linear guide block for heavy-load and high-rigidity linear motion systems. The model should be matched with the corresponding RGR55 rail, while preload and accuracy grade should be selected according to the actual machine requirement.

• Available Preload: Z0 / ZA / ZB
• Available Accuracy Grade: H / P
• Matched Rail: RGR55 rail
• Rail Mounting Type: Standard mounting from top
• Lubrication: Grease lubrication or oil lubrication can be selected according to machine speed, load, and maintenance method
• Oil Viscosity Reference: Oil lubrication normally uses oil in the range of about 32–150 cSt
• Grease Replenishment Reference: Check grease every 100 km or every 3–6 months, depending on operating conditionsDust Protection Options: Standard protection, ZZ, KK, or DD configurations are available according to the working environment
• Rail Length: Standard or cut-to-length rail can be supplied according to the required travel length or drawing
• Typical Use Level: Suitable for high-rigidity, heavy-load, and higher moment-load linear motion systems in large machine structures

The RG catalog defines Z0 / ZA / ZB preload classes, H / P accuracy for interchangeable type, lubrication reference, dust protection options, and standard rail length logic for the RG series.

Photo Reference:

The photos above show the actual RGH55HA long square roller block, including the top mounting surface, model marking, side profile, end face, lubrication port, internal roller circulation area, and bottom roller arrangement. They are provided to help customers check the real block structure instead of relying only on catalog drawings.

For replacement review, the photos should be checked together with the drawing and technical specifications before order confirmation.

• RGH55HA can be used as a cross-reference model for selected 55 size long square roller guide blocks with similar mounting dimensions and long block configuration. For replacement projects, rail series, block type, mounting dimensions, preload grade, and accuracy grade should be checked against the original assembly before ordering.

• Standard Reference:
  The following cross-reference table is provided for preliminary model comparison only. Final replacement suitability must be confirmed against the original rail series, block dimensions, mounting hole pattern, preload, accuracy grade, rail profile, and running clearance before order.
• Performance Consideration:
  As the HA long block version, RGH55HA should be compared with the original assembly by block length, mounting layout, preload grade, and accuracy grade. For replacement review, dimensional matching and running condition are more important than model name similarity.
• Important Note:
  HIWIN RG series has interchangeable and non-interchangeable versions. Cross-brand replacement is only a reference; rail profile, mounting dimensions, preload grade, accuracy grade, and running clearance must be checked before order.

• Long Block Design for Higher Moment Support

The RGH55HA roller linear guide block uses a longer block body than the CA version. This helps improve moment-load support when the machine axis carries a longer moving table, heavier fixture, or offset working load.

• Higher Load Capacity in 55 Size

RGH55HA provides a dynamic load rating of 167.8 kN and a static load rating of 348 kN. This gives the block a stronger load margin than the standard RGH55CA block while keeping the same 55-size RGR55 rail platform.

• Stronger Resistance to Directional Loads

With static rated moments of MR 11.15 kN·m, MP 10.25 kN·m, and MY 10.25 kN·m, RGH55HA is suitable for axes affected by pitching, rolling, or yawing moments. This is useful in vertical axes, large moving tables, and heavy-duty machining structures.

• Roller Contact for High Rigidity

RGH55HA uses a roller contact structure instead of a conventional ball contact design. The roller line contact helps increase stiffness between the rolling elements and the raceway, reducing deformation under heavier working loads.

• Square Block with Top Mounting

RGH55HA adopts a high square block structure with mounting from the top. The M12 * 18 block mounting thread provides a firm fixing method for machine tables, slide bases, and heavy-duty mechanical assemblies.

• Matched RGR55 Rail System

RGH55HA is designed to work with the corresponding RGR55 roller guide rail, keeping block and rail selection clear for matched assembly supply and cut-to-length rail orders.

• Suitable for Larger Heavy-Duty Axis Layouts

Compared with RGH55CA, the HA version is more suitable when the equipment requires higher moment-load capacity, a longer contact area, or improved stability under heavy machining and repeated positioning.