MG320T/0.5M 20T 40Cr Steel Motor Gear (0.5mm Module, 3.175mm Bore) by GPM  [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.