39T Mod1 Safe-D8 Pinion Gear (ARA311127)

This tough steel 39T Mod1 Safe-D8 pinion gear is built for rugged RC driving, delivering dependable power transfer from the motor to the drivetrain. It comes with the 39T pinion, plus a M4 x 4mm set screw and a 6mm E-clip to secure it on an 8mm motor shaft.

Designed for reliability, the gear features a wide, precision-tooth profile for smooth engagement and a D-shaped bore that matches the motor shaft so drive and braking aren’t lost if the set screw backs out. It fits 8mm shafts, has a threaded set-screw hole, and includes an E-clip for secure retention.