Yokomo RD-631 Aluminum Top Shaft for RD/SD/MD Series  [RD-631]

Yokomo RD-631 jp
Price:
CAD$21.68
Brand:
Yokomo
Model:
RD-631
GTIN:
639342231065
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Precision aluminum top shaft for RD, SD and MD drivetrains

This aluminum top shaft is an RC-scale replacement part designed for Yokomo RD, SD, and MD series drivetrains. It shares compatibility with the conventional Y2-631 top shaft while offering a wider D-cut section to accept lightweight spur gear hubs such as RD-630BK, RD-630BL, RD-630P, and RD-630R.

Use this shaft when you need a durable aluminum option that improves compatibility with low-mass gear hubs during setup or tuning. The part is intended for standard shaft swaps in model-scale drivetrains and does not change vehicle routing or system architecture.

Specifications

  • Item: Aluminum top shaft
  • Material: Aluminum
  • Model Number: RD-631
  • Compatibility: Compatible with RD, SD and MD series top shafts, fits conventional top shaft Y2-631, wider D-cut to accept RD-630BK RD-630BL RD-630P RD-630R lightweight spur gear hubs, supports listed chassis models

Compatible Models

  • MDR-010
  • MDR-010A
  • MDR-010LTS
  • MDR-020
  • MDR-020CE
  • MDR-030
  • RDR-010
  • RDR-010-1
  • RDR-010G
  • RDR-010G2
  • RDR-010G2-1
  • RDR-020
  • SDR-010
  • SDR-010LTS
  • SDR-020
  • SDR-030
  • DP-RS13SP
  • DP-FCBN

Choose the RD-631 when a machined aluminum top shaft with expanded D-cut compatibility is required for fitting lightweight spur hubs during drivetrain refinement and chassis setup.
Remark :
Due to limited stock availability, please notice that some Yokomo 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.

Is the RD-631 a direct swap for the stock shaft used in RD series cars?

Yes. The RD-631 matches the conventional Y2-631 shaft form and can replace the stock top shaft where that specification is called out.

Can I fit lightweight spur hubs to this shaft without modification?

Yes. The D-cut has been widened specifically to accept lightweight hubs such as RD-630BK, RD-630BL, RD-630P, and RD-630R without additional machining.

What are the material benefits of choosing aluminum for the top shaft?

Aluminum offers a good balance of strength and minimal added mass, helping maintain drivetrain durability while keeping rotating weight low.

Where can I confirm my chassis is supported by this part?

Check the Compatible Models list above for supported MDR, RDR and SDR entries plus DP-RS13SP and DP-FCBN to confirm fitment.

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