1/48 Scale Steel 21T Pinion Gear - Kyosho UM321C  [KY-UM321C]

Kyosho UM321C - Steel Pinion Gear(21T)1/48
Price:
CAD$0.00
Brand:
Kyosho
Model:
KY-UM321C
GTIN:
4548565271634
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Spares / Hop-ups - Kyosho - RB6.6 spare parts category
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21-Tooth Steel Pinion for Small-Scale Drivetrains

This Kyosho UM321C steel pinion is a 21-tooth gear made for 1/48 scale radio-controlled drivetrains. As a direct replacement it delivers consistent meshing with matching spur gears and offers improved wear resistance compared with softer materials.

When fitting, set the gear mesh and axial alignment on the motor shaft, tighten the set screw in the pinion hub without over-torquing, and check that rotation is smooth before running. Inspect teeth and the mating spur gear regularly to keep the drivetrain reliable.

Specifications

  • Item: Steel Pinion Gear
  • Material: Steel
  • Model Number: UM321C
  • Compatibility: 1/48 scale RC models

This pinion functions as a straightforward replacement or tuning item for small-scale RC drivetrains that require a steel 21T gear, balancing durability with predictable engagement.
Remark :
Due to limited stock availability, please notice that some Kyosho items may have to order from the factory and the ready time is around 4-6 weeks. Customer purchases the item is assumed to accept the waiting time which allows us to order directly from the manufacturer if the item is out of our warehouse.

How do I set the gear mesh with this pinion?

Move the pinion axially until you see minimal backlash and even tooth contact, rotate the gears slowly to confirm no binding, then secure the set screw with moderate torque so the pinion cannot shift under load.

Will this pinion fit my motor shaft?

Fitment depends on your motor shaft diameter and the pinion bore. Measure the shaft and compare to the pinion bore; use a suitable adapter or different pinion if dimensions do not match.

Does a steel pinion cause extra wear to spur gears?

Steel is harder than many spur gear materials, so it can increase wear on softer mating gears. Regular inspection and matching compatible spur materials help manage wear.

Is UM321C suitable for regular track or club use?

Yes, it is suitable for everyday driving and tuning. Monitor the mesh and check for heat or tooth wear after heavy use to ensure long service life.

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