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When a slipping or undersized gear throws off your entire motion system, the downstream damage — missed steps, stripped teeth, misaligned shafts — costs far more than the part itself. Whether you're a robotics builder, CNC hobbyist, or automation engineer, you need a spur gear that holds tolerance under load and fits your shaft without shimming or adapters.
This 1.5 Mod spur gear is machined from 45# medium-carbon steel, offering a reliable balance of hardness and machinability. It features 35 teeth (35T) with a tooth width of 12 mm or 15 mm depending on variant (approximately 0.47–0.59 in), and bore diameters ranging from 6 mm to 25 mm (approximately 0.24–0.98 in). Step bore variants include a precision-machined keyway step for positive shaft engagement. Outer diameter is approximately 55.5 mm (≈2.19 in) based on standard 1.5 Mod 35T geometry.
Typical use cases include stepper motor pinion drives in 3D printers and CNC routers, servo gear trains in robotic arms and RC platforms, and reduction stage gearing in conveyor and actuator assemblies — anywhere a compact 1.5 module spur gear with a reliable bore fit is required.
Machined from 45# carbon steel for a strong combination of wear resistance and toughness — holds up under continuous cyclic loading without brittle fracture.
Standard 1.5 Mod tooth geometry ensures accurate meshing with any compatible 1.5 Mod rack or mating gear, minimizing backlash in precision drive applications.
Available in bore sizes from 6 mm to 25 mm to fit a broad range of motor and shaft diameters — select the exact bore that matches your shaft without custom machining.
Select variants include a precision-machined keyway step (e.g., 4×1.8 mm, 5×2.3 mm, 6×2.8 mm, 8×3.3 mm) for positive rotational engagement and zero-slip torque transfer.
Choose 12 mm tooth width for compact assemblies or 15 mm for higher torque capacity — both share the same 35T 1.5 Mod profile for interchangeability.
Bore tolerances are machined to suit standard motor shaft diameters, making this a direct replacement or upgrade pinion gear for NEMA-frame stepper and servo motor applications.
| Module | 1.5 |
|---|---|
| Number of Teeth | 35T |
| Pitch Diameter | 52.5 mm (≈2.07 in) |
| Outer Diameter | ≈55.5 mm (≈2.19 in) |
| Tooth Width | 12 mm or 15 mm (see variant options) |
| Bore Diameter | 6 mm – 25 mm (see variant options) |
| Keyway | See variant options (step bore variants only) |
| Material | 45# Medium-Carbon Steel |
| Pressure Angle | 20° |
| Finish | See variant options |
| Gear Type | Spur Gear (Pinion) |
Measure your motor shaft diameter with a caliper. Select the bore size that matches — for example, a 6.35 mm (1/4 in) shaft suits the 6 mm bore with a light press fit, while an 8 mm shaft suits the 8 mm bore. For keyway shafts, choose a step bore variant whose keyway dimensions match your shaft's key.
Both share the same 1.5 Mod 35T tooth profile and bore range. The 15 mm tooth width provides a larger contact area, which increases torque capacity and load distribution — useful in higher-load or higher-speed applications. The 12 mm variant is more compact and suited to space-constrained assemblies.
A step bore includes a precision-machined keyway slot (e.g., 4×1.8 mm, 5×2.3 mm) that accepts a matching key on the motor shaft. This prevents the gear from rotating independently of the shaft under torque. If your motor shaft has a flat key or keyway, choose a step bore variant. If your shaft is smooth and you plan to use a set screw, choose a standard bore variant.
Yes — any gear or rack with a 1.5 Module and 20° pressure angle will mesh correctly with this spur gear. Verify both the module and pressure angle of your existing components before ordering. The 35-tooth count determines the gear ratio when paired with a mating pinion.
45# medium-carbon steel offers a tensile strength typically in the range of 600–800 MPa, making it suitable for moderate-to-high load gear applications including CNC drives, robotic joints, and conveyor systems. For extreme shock loads or corrosive environments, consider whether a hardened or stainless variant better suits your needs.
45# carbon steel has moderate corrosion resistance. For indoor or dry environments it performs well. In humid, wet, or chemically exposed environments, we recommend applying a light machine oil or grease coating, or selecting a stainless steel gear variant if available. Contact us to confirm finish options.
This 1.5 Mod 35T pinion gear is widely used in 3D printer extruder and axis drives, CNC router motor mounts, robotic arm joint actuators, RC vehicle gear trains, and small conveyor or linear actuator reduction stages. Its bore range covers most NEMA 17 and NEMA 23 stepper motor shaft sizes.
