0.5M 18T Motor Pinion MG318T/0.5M for 3.175mm Motor Shafts by GPM [MG318T/0.5M]

Q: Will changing the pinion tooth count affect drive ratio?

Yes â increasing or decreasing the pinion teeth changes the gear ratio, which alters motor RPM and torque at the wheels; pick tooth counts that suit your motor and application.

40Cr Steel Motor Gear 18T ( Module:0.5mm, Motor Tooth Diameter:3.175mm) - GPM MG318T/0.5M

Price:

AUD$11.31

Brand:

GPM

Model:

MG318T/0.5M

GTIN:

4894538411423

Condition:

Brand New

Color Available:

Quantity:

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Description
FAQ

18T motor pinion — installation notes

The MG318T/0.5M motor gear is an 18-tooth pinion designed for motors that use a 0.5mm module and a 3.175mm motor tooth diameter. Manufactured from hardened 40Cr steel, it delivers improved wear resistance over typical stock gears and keeps consistent tooth form for predictable drivetrain behavior.

The pinion has 18 teeth and a round-shaped bore sized to fit a 3.175mm motor tooth diameter; it is secured by two 3x3 set screws to hold position on the motor shaft. Verify your motor shaft diameter, module, and desired tooth count prior to purchase to ensure proper fitment.

When fitting the pinion, check spur engagement, avoid adding excessive preload, and tighten the set screws enough to secure the gear without deforming the shaft; proper meshing limits premature wear and helps maintain efficiency during tuning changes.

Will changing the pinion tooth count affect drive ratio?

Yes — increasing or decreasing the pinion teeth changes the gear ratio, which alters motor RPM and torque at the wheels; pick tooth counts that suit your motor and application.

What should I check when meshing with the spur gear?

Ensure even contact across tooth faces, avoid heavy preload, and confirm the set screws secure the pinion without distorting the shaft to reduce wear.