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The "Hidden Tax" on Packaging Machinery: Why You Pay Too Much for INA & Rexroth Bearings

2025-12-09

Quick Summary for Maintenance Teams

The Issue: OEM codes like INA "F-318994" on packaging machines are not listed in public catalogs.
The Reality: These are typically 100% mechanically interchangeable with standard ISO RUE/KWVE series guides.
The Solution: Don't pay OEM markups. We verify the standard replacement using just 3 physical dimensions.

If you run high-output film or printing lines—like W&H Varex blow molders, Bobst presses, or Reifenhauser extruders—you know that downtime costs calculate in thousands per hour. While these machines are engineering marvels, their linear motion maintenance often carries an inflated price tag.

It’s a common scenario: You pull a worn block from a film station, clean off the grease, and find a code like this:

Your local distributor says, "Part not found." The machine OEM quotes a 12-week lead time and a 300% markup.

Transparency: What Does This Code Actually Mean?

The code F-318994 is a "Special Drawing Number." Manufacturers like Schaeffler (INA) and Bosch Rexroth issue these specifically for OEMs. It acts as a commercial barrier, directing replacement orders back to the machine builder.

However, from an engineering perspective, the barrier is thin. Here is the transparent comparison:

Feature	OEM "Special" Part (F-Series)	Standard Equivalent (Stock)
Geometry (ISO)	Standard ISO Dimensions	Identical ISO Dimensions
Availability	Restricted (OEM Only)	Global Stock
Technical Difference	Specific Grease / Private Label	Standard Lithium Grease

The Verdict: Unless your application specifically requires exotic vacuum or cleanroom lubrication (rare in standard packaging), the standard ISO block is a direct, drop-in replacement.

How to Order the Correct Standard Part

We use a "Geometry Verification" method to bypass the unsearchable part number. We need three simple measurements from your existing block:

Rail Width (W): The top width of the track (usually 25, 35, 45, or 55mm).
Hole Pitch (P): Center-to-center distance of the mounting holes.
Block Height (H): Total height from rail bottom to block top.

Common Questions (FAQ)

Will this affect my machine's warranty?

If your machine is past its initial warranty period, using standard ISO components from the same Tier-1 brand (INA/Rexroth) is industry standard practice and ensures the same performance levels.

Do you have these in stock?

Yes. We stock the standard RUE and KWVE series equivalents commonly used in W&H and Bobst machines, ready for immediate dispatch.

Have a "Mystery" Block? Let us Identify it.

Don't guess. Send us a photo of the label and the rail width.

Upload Your Photo for Free Identification »

Guia Linear Hiwin

Parafuso de bola

Guia Linear para Impressora 3D

Rail -guia linear

Parafuso de esferas de solo

rolamento linear

Apoio do parafuso da bola

Acoplamento de eixo

RANHURA DA BOLA

Carcaça da Porca de Esferas

eixo linear

Eixo de aço inoxidável

Suportes de Eixo Linear

Guia Linear CNC

Guia Linear Hiwin

Parafuso de bola

Guia Linear para Impressora 3D

Rail -guia linear

Parafuso de esferas de solo

rolamento linear

Apoio do parafuso da bola

Acoplamento de eixo

RANHURA DA BOLA

Carcaça da Porca de Esferas

eixo linear

Eixo de aço inoxidável

Suportes de Eixo Linear

Guia Linear CNC

Detalhes das soluções

The "Hidden Tax" on Packaging Machinery: Why You Pay Too Much for INA & Rexroth Bearings

The "Hidden Tax" on Packaging Machinery: Why You Pay Too Much for INA & Rexroth Bearings