2303 Series Steel, MOD 0.8 Pinion Gear (4mm Round Bore, 15 Tooth)

This 15 tooth, 32 pitch pinion gear is a slip-fit on a 4mm shaft. The M4 x 0.7mm set-screw fixes the gear onto the shaft and holds it from spinning or moving axially. While this gear can mesh with any MOD 0.8 gear, it’s most commonly used with a 105 tooth hub gear. This combo creates a 7:1 ratio--either underdrive or overdrive depending on your preference for speed or for torque.