Yokomo RD-631 aluminum top shaft replacement for RD SD MD series  [RD-631]

Yokomo RD-631 jp
Price:
USD$15.50
Brand:
Yokomo
Model:
RD-631
GTIN:
639342231065
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Aluminum top shaft for RD/SD/MD series

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.

What does the RD-631 replace and is it cross-compatible with the stock shaft?

The RD-631 is an aluminum replacement top shaft compatible with the conventional Y2-631 top shaft form factor and can be used as a direct substitute where that shaft is specified.

Will this shaft accept lightweight spur gear hubs?

Yes, the D-cut section is widened to accept lightweight spur gear hubs including RD-630BK, RD-630BL, RD-630P, and RD-630R.

What material is the RD-631 made from?

The part is machined from aluminum to provide a balance between strength and weight for RC drivetrain use.

Which chassis models are supported by this shaft?

Refer to the Compatible Models list above, which includes MDR, RDR, SDR series entries and DP-RS13SP and DP-FCBN among supported models.

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