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When a stripped or undersized pinion gear stalls your RC car, CNC router, or robotics project, every minute of downtime costs you. This 1 Module 17-Tooth steel spur motor pinion gear is engineered for hobbyists, makers, and engineers who need a dependable, drop-in replacement or upgrade gear that holds up under repeated load cycles.
Machined from carbon steel with a hardened finish, this pinion gear features a 19mm outer diameter and a 17-tooth involute profile at 1M (1 Module) pitch. The bore is available in 4mm, 5mm, 6mm, 6.35mm (1/4"), 7mm, 8mm, and 10mm to match a wide range of motor shaft diameters — from approximately 0.16" to 0.39". Overall gear width is typically 10–15mm depending on bore variant.
Typical use cases include motor pinion replacement on 1/10 and 1/8 scale RC vehicles, drive gear upgrades on desktop CNC machines and laser cutters, and torque transmission components in DIY robotics arms and automated mechanisms. Long-tail search terms this product covers: 1 mod 17 tooth steel pinion gear, RC motor pinion gear 19mm OD, 6.35mm bore spur gear replacement.
| Module | 1M (1 Module) |
|---|---|
| Number of Teeth | 17T |
| Outer Diameter | 19mm (0.748") |
| Bore Diameter | 4 / 5 / 6 / 6.35 / 7 / 8 / 10mm (see variant options) |
| Gear Width | See variant options |
| Tooth Profile | Involute |
| Pressure Angle | 20° |
| Material | Carbon Steel |
| Finish | Hardened / Oxide |
| Quantity per Pack | 1 piece |
| Compatible Pitch | 1 Module (1M) |
Measure your motor shaft diameter with a caliper. Select the bore size that matches exactly — for example, most 540-size RC motors use a 3.175mm (1/8") or 5mm shaft, while larger brushless motors often use 6.35mm (1/4") or 8mm shafts. If your shaft is imperial, the 6.35mm bore equals exactly 1/4".
Module is the metric standard for gear tooth size. A 1M gear has a tooth pitch of 3.14mm (π × 1mm). It will mesh correctly with any other 1M spur gear, rack, or pinion — regardless of tooth count — as long as the pressure angle also matches (standard 20°). Do not mix with 0.8M or 32DP gears as they are not compatible.
This gear is machined from carbon steel, which offers significantly higher shear strength than plastic or aluminum pinions. It is suitable for moderate-to-high torque applications such as 1/10 and 1/8 scale RC drivetrains, small CNC axis drives, and robotic arm joints. For extreme shock-load environments, consider using a set screw or keyway to secure the gear to the shaft.
This pinion gear is designed to be secured with a set screw (grub screw) tightened against the motor shaft. Ensure the bore matches your shaft diameter for a snug fit before tightening. For shafts with a flat (D-cut), align the set screw to the flat for maximum holding force. If your shaft is round, consider applying thread-lock compound to the set screw.
The hardened oxide finish provides a degree of corrosion resistance for typical indoor workshop and occasional outdoor use. For prolonged outdoor or wet environments, apply a light coat of gear grease or anti-corrosion spray to the tooth surface and bore. This will extend service life and maintain smooth meshing performance.
Yes. The 1M 17T profile is commonly used on desktop CNC routers, laser engravers, and 3D printer extruder drives. Verify that your existing rack or mating gear is also 1M pitch and that the bore matches your stepper or servo motor shaft. The 19mm OD and standard involute profile make it a direct replacement for most 1M pinion gears in these machines.
Each order includes 1 piece (x1Pcs). If you need multiple gears for a multi-axis machine or want to keep spares on hand, simply increase the quantity in your cart before checkout.
