HRNSG3225 - 25t Steel 32p Pinion Gear 5mm Bore

This 25‑tooth 32 pitch pinion gear is precision CNC machined from hardened steel for robust engagement in RC drivetrains using 32 DP spur gears. The 5 mm bore fits directly onto standard 5 mm motor shafts found on many 1/10 and 1/8 scale electric cars, trucks, and buggies, allowing secure attachment with the included set screw. Heat treatment and nitriding of the steel improve surface hardness and corrosion resistance, which increases wear life under the high torque demands of brushless power systems. The gear’s tooth profile and pitch are engineered for smooth, consistent power transfer while minimizing drivetrain lash and noise. Face width and overall length are designed to clear motor housings and maintain proper mesh without interfering with adjacent components. Installation only requires aligning with the spur gear, seating on the shaft, and tightening the set screw with a hex wrench, with optional thread locker for added security. This pinion is suitable for tuning gear ratios to balance acceleration, top speed, and motor load in competitive or recreational setups.

• 25 tooth 32 pitch gear matched to standard 32 DP spur systems
• CNC machined hardened steel for durability and wear resistance
• nitrided finish increases surface hardness and corrosion resistance
• 5 mm bore fits directly on most electric motor shafts
• included M4x4 mm set screw for secure mounting
• optimized face width for smooth mesh and minimal interference
• suitable for tuning performance and replacing worn gears