GPM Racing 40CR Steel Motor Gear 20T (Module:0.5mm,motor Tooth Diameter:3.175mm) (MG320T/0.5M)

20T pinion for 0.5mm module motors

This 40Cr steel motor gear serves as a replacement pinion for motors that accept a 0.5mm module and a 3.175mm motor bore. The 20-tooth pinion features a round motor hole and is retained with two 3x3 set screws for a secure fit.

Material and finish: manufactured from 40Cr steel with a hardened black treatment to improve wear resistance and transmission longevity versus softer pinions.

Compatibility advice: check that the motor specification lists a 0.5mm module and a 3.175mm tooth diameter before purchase; mismatched motors may require modification.

Installation steps: position the pinion so the round hole seats on the shaft, tighten both 3x3 set screws, and verify gear mesh and backlash with the spur gear prior to full use.

Tuning note: this pinion is a reliable steel option for replacement or modest gearing adjustments where extra durability is needed in scale drivetrains.

What specification confirms compatibility with a motor?

Compatibility is confirmed when the motor is specified for a 0.5mm module and has a 3.175mm motor bore.

How is the pinion fixed to the shaft?

The pinion is fixed by inserting it onto the shaft so the round hole seats, then tightening the two 3x3 set screws to secure it.

What does the black hardening provide?

The hardened black treatment increases surface hardness and wear resistance, improving transmission durability over untreated pinions. Write Product Review Please sign in your account before you can write any review. Sign In Close

Made to order: GPM Racing parts are shipped to us from GPM's factory, so please allow around 14 days for dispatch.