Extra Hard Steel Pinion Gear 5mm Bore Mod0.8 20T (RRP8720)

An extra-hard steel pinion gear designed for brushless RC motors, this 20-tooth gear has a 5mm bore and a 0.8 module for durable, precise drive in high-performance setups.

Made from high-carbon steel, it is precision-machined and stamped with the tooth count for easy identification. A 4mm set screw is included, and a 2mm Allen wrench (not included) is required to tighten it. It fits motors with a 5mm shaft; for 1/8" shaft motors, a 5mm-to-1/8" reducer sleeve is required. Note that 32-pitch gears and 0.8-module pinions can be used together without adverse effects, though 0.8-module gears have a slightly larger outside diameter per tooth (about 0.00027 inches).