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When a loose or mismatched pinion gear causes slippage, backlash, or premature wear in your drive train, the entire motion system suffers. Engineers, CNC builders, and robotics makers who need a reliable 1 Module 22-tooth spur gear with a secure set-screw retention system will find this motor pinion gear a direct, dependable solution.
Each gear is machined from steel with a black oxide finish for corrosion resistance and reduced surface friction. The 1 Module (Mod 1) tooth profile delivers a pitch diameter of 22 mm (approximately 0.87 in). Bore options span from 5 mm (0.197 in) up to 12 mm (0.472 in) in round bore, D-bore, and keyway configurations, covering the most common motor shaft standards. Overall gear width is typically 10–15 mm (0.39–0.59 in); confirm your specific variant for exact dimensions.
Typical use cases include DC motor pinion drives in CNC router Z-axis assemblies, stepper motor output shafts in 3D printer extruder gearboxes, and servo-driven actuator stages in robotic arm joints — all applications where a compact 22-tooth Mod 1 spur gear with set screw locking is required for repeatable positioning.
Integrated set screw(s) lock the gear firmly onto the motor shaft, preventing rotational slip under load without requiring adhesives or press-fit tooling.
The black oxide surface treatment adds a layer of corrosion resistance and reduces light reflection — ideal for enclosed drive housings and industrial environments.
Available in round bore (5–12 mm), D-bore (flat-sided shaft), and keyway bore variants, covering the widest range of motor shaft standards in a single product line.
The standardized Mod 1 pitch ensures direct interchangeability with Mod 1 racks, idler gears, and mating pinions — no custom machining required for system integration.
22 teeth provide a practical intermediate ratio suitable for speed-reduction or speed-increase stages in CNC, robotics, and automation drive trains.
Order as 1 pc, 2 pcs, 3 pcs, or 5 pcs to match your project build quantity or spare-parts inventory needs without overstocking.
| Module | 1 (Mod 1) |
|---|---|
| Number of Teeth | 22 |
| Pitch Diameter | 22 mm (0.87 in) |
| Pressure Angle | 20° |
| Bore Type | Round bore / D-bore / Keyway (see variant options) |
| Bore Diameter | 5 mm – 12 mm (see variant options) |
| Gear Face Width | Typically 10–15 mm (0.39–0.59 in) |
| Material | Steel |
| Surface Finish | Black Oxide |
| Retention Method | Set screw(s) |
| Pack Quantity | 1 pcs / 2 pcs / 3 pcs / 5 pcs (see variant options) |
| Gear Type | Spur Gear (external) |
Measure your motor shaft diameter with a caliper. Select the matching round bore variant (e.g., Bore 8 mm for an 8 mm shaft). If your shaft has a flat cut, choose the corresponding D-bore option. If your shaft has a keyway slot, select the keyway bore variant that matches both the shaft diameter and keyway dimensions (e.g., Bore 8 mm Keyway 3×1.4 mm).
A round bore is a plain cylindrical hole secured by set screw pressure alone. A D-bore has one flat side that matches a D-shaped shaft, providing positive rotational engagement in addition to the set screw. A keyway bore includes a rectangular slot that accepts a key inserted between the shaft and gear, offering the highest torque transmission of the three options.
Yes. Any gear or rack with a 1 Module (Mod 1) tooth profile and a 20° pressure angle will mesh correctly with this pinion. Confirm that your mating component is also Mod 1 — mixing modules (e.g., Mod 1 with Mod 0.8) will result in incorrect meshing and accelerated wear.
Black oxide provides mild corrosion resistance suitable for indoor, low-humidity environments. It is not equivalent to stainless steel or zinc plating for outdoor or high-moisture applications. For best results, apply a light machine oil to the gear surface periodically, especially in environments with temperature cycling or occasional moisture exposure.
A hex (Allen) key is required to tighten the set screw. The exact hex key size depends on the set screw used in your specific bore variant. Common sizes are M3 (1.5 mm hex) or M4 (2 mm hex). We recommend applying a small amount of thread-locking compound to the set screw for vibration-prone applications.
This spur gear is suitable for moderate-speed motor pinion applications typical of CNC drives, 3D printer extruders, and light robotic actuators. For very high-speed or high-torque applications, verify that the bore fit is within tolerance and that the set screw is properly torqued. Contact us to confirm suitability if your application exceeds 3,000 RPM or involves significant shock loading.
Yes — the 1 Mod 19T variant listed in the Amount options also uses the Mod 1 tooth profile and will mesh with the same Mod 1 racks and gears. The difference is the tooth count (19T vs. 22T), which changes the gear ratio when paired with a mating gear. Choose 19T for a slightly higher speed ratio or 22T for a slightly higher torque ratio in the same Mod 1 system.
