M6.4 x 1.7 Precision Spacer M4WD-03/BK by 3Racing  [M4WD-03/BK]

Tamiya Mini 4WD M6.4 X 1.7 Ball Bearing Spacer (black) - 3RACING M4WD-03/BK
Price:
USD$2.50
Brand:
3Racing
Model:
M4WD-03/BK
Condition:
Brand New
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Technical note on M4WD-03/BK M6.4 x 1.7 spacer for Mini 4WD

The M4WD-03/BK functions as a replacement axial spacer for Mini 4WD drivetrains specifying M6.4 x 1.7 bearing spacing. It locates between bearing faces or between a bearing and adjacent component to preserve axial position and alignment in compact 1/32 assemblies.

For bench work and rebuilds the spacer provides repeatable seating and helps control lateral play introduced by variable stack heights. Inspect mating surfaces for burrs and confirm bearings are seated squarely to ensure correct operation.

Compatibility and use: apply this spacer where the axle or roller assembly calls for M6.4 x 1.7 geometry. Treat it as a maintenance and fitment item rather than a performance upgrade, and verify overall stack height and clearance in your specific Mini 4WD configuration.

What inspection steps should I take before installing the spacer?

Verify the spacer inner and outer diameters match the bearing bore and housing, inspect for machining marks, and check that the planned stack height yields free rotation without end float.

How does the spacer affect bearing preload and axial clearance?

The spacer sets the nominal distance between bearing faces; use it to restore intended axial clearance and avoid introducing unintended preload which can increase friction or wear.

Are there common fitment pitfalls to watch for?

Common issues include incorrect spacer orientation, debris trapped between components, and mismatched bearing dimensions; measure components carefully before final assembly.