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When a slipping or mismatched gear disrupts your motion-control build, every project stalls. Makers, robotics engineers, and CNC hobbyists who need a reliable, drop-in pinion gear for stepper or servo motor shafts will find this 1 Mod spur gear series a dependable solution across a wide range of drive configurations.
Each gear is machined from 45# carbon steel and features a Module 1 (1M) tooth profile. The tooth count ranges from 15T to 40T, with bore diameters spanning 5 mm to 14 mm (approximately 0.20 in to 0.55 in). A stepped hub design accommodates set-screw or press-fit shaft retention depending on your assembly method.
Typical use cases include stepper motor pinion drives in desktop CNC routers, rack-and-pinion linear actuators for 3D printer gantries, and gear-reduction stages in small robotic arms or conveyor systems requiring a 1 Mod pitch-compatible mating gear.
Machined from 45# medium-carbon steel for a balance of machinability and load-bearing strength suited to light-to-medium duty drive applications.
Standard 1M pitch ensures direct interchangeability with any Module 1 rack or mating gear, simplifying sourcing and replacement in existing drive trains.
Eight tooth counts (15T – 40T) combined with up to six bore sizes (5–14 mm) give you precise gear-ratio and shaft-fit flexibility without custom machining.
The integrated step hub provides a positive axial reference surface and additional material for set-screw engagement, reducing shaft slip under dynamic loads.
Available in 1, 5, 10, or 20-piece packs — order single units for prototyping or multi-packs for production runs and spare-parts inventory.
Suitable for CNC routers, 3D printer gantries, rack-and-pinion actuators, robotic joints, and conveyor reduction stages using standard 1 Mod pitch components.
| Module | 1M (Module 1) |
|---|---|
| Tooth Count | 15T / 16T / 18T / 20T / 25T / 30T / 35T / 40T |
| Bore Diameter | 5 mm / 6 mm / 8 mm / 10 mm / 12 mm / 14 mm |
| Material | 45# Carbon Steel |
| Finish | See variant options |
| Pressure Angle | 20° (standard) |
| Hub Style | Stepped hub with set-screw flat |
| Pitch Diameter (15T) | 15 mm (0.59 in) |
| Pitch Diameter (40T) | 40 mm (1.57 in) |
| Face Width | See variant options |
| Weight (per piece) | See variant options |
| Packing Quantity | 1 / 5 / 10 / 20 pcs |
Select the tooth count based on your desired gear ratio. Pair this pinion with a larger mating gear to reduce speed and increase torque, or use a similar tooth count for a 1:1 drive. For example, a 15T pinion meshing with a 30T gear gives a 2:1 reduction. Refer to your drive-train design for the target ratio before selecting.
Standard NEMA 17 stepper motors typically have a 5 mm output shaft. Select the 5 mm bore variant for a direct fit. If your motor has a 6.35 mm (1/4 in) shaft, the 6 mm bore may require light reaming — contact us to confirm before ordering.
Yes. All gears in this series use a standard Module 1 (1M) tooth profile with a 20° pressure angle, making them directly compatible with any 1M rack, pinion, or mating gear that follows the same standard.
45# carbon steel (equivalent to AISI 1045) offers a tensile strength of approximately 600–700 MPa in its normalized state. It is well-suited for light-to-medium duty drives such as CNC routers, 3D printers, and small robotic actuators. For heavy-duty or high-cycle industrial applications, consider hardened or alloy steel alternatives.
45# carbon steel has moderate corrosion resistance. For environments with moisture or chemical exposure, we recommend applying a light machine oil coating after installation, or selecting a zinc-plated or stainless-steel alternative if available. Indoor, dry environments are the ideal operating condition for this gear series.
Yes. These 1M spur gears are commonly used as the pinion in rack-and-pinion linear motion systems for CNC gantries, laser cutters, and similar machines. Ensure the mating rack also uses Module 1 pitch and a matching 20° pressure angle for correct mesh geometry.
For prototyping or single-machine builds, the 1-piece option is ideal. For small production runs or spare-parts kits, the 5-piece or 10-piece packs offer better per-unit value. The 20-piece pack is suited for larger batch builds or inventory stocking. Select your quantity in the variant options above.
