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When a slipping or mismatched gear brings your CNC router, 3D printer, or automation rig to a halt, you need a replacement you can trust to mesh cleanly and hold torque without play. These Module 1.5 pinion spur gears are engineered for makers, machine builders, and small-batch manufacturers who demand consistent, repeatable motion from every drivetrain component.
Each gear is machined from #45 carbon steel — a medium-carbon alloy known for its balanced hardness and toughness — and features a no-step (flush-hub) profile that simplifies shaft mounting. The module 1.5 pitch standard means tooth geometry is uniform across the full range: outer diameters scale predictably from approximately 21 mm (0.83 in) at 12T up to approximately 123 mm (4.84 in) at 80T, with a consistent 1.5 mm pitch and standard 20° pressure angle throughout.
Typical use cases include CNC rack-and-pinion linear drives for router gantries, gear-reduction stages in robotic joint actuators, and motor-output pinions in conveyor or indexing systems — anywhere a reliable module 1.5 metal spur gear is required for no-step transmission.
| Module | 1.5 |
|---|---|
| Pressure Angle | 20° |
| Material | #45 Carbon Steel |
| Tooth Count Range | 12T – 80T (see variant options) |
| Outer Diameter (OD) | See variant options |
| Bore Diameter | See variant options |
| Hub Style | No-step (flush hub) |
| Tooth Profile | Involute spur |
| Pitch | 1.5 mm module |
| Surface Finish | See variant options |
| Packing Quantity | 1 Pcs per order |
Select your tooth count based on the gear ratio you need. Divide the driven gear's tooth count by the driving pinion's tooth count to get the reduction ratio. For CNC rack-and-pinion drives, also factor in the rack pitch to calculate linear travel per motor revolution. Use a smaller tooth count (e.g., 12T–20T) for higher speed, and a larger count (e.g., 60T–80T) for higher torque output.
For Module 1.5 gears, the pitch diameter equals the tooth count multiplied by the module (T × 1.5 mm), and the outer diameter (addendum circle) is approximately (T + 2) × 1.5 mm. For example, a 40T gear has an OD of approximately 63 mm (2.48 in). Please confirm exact dimensions from the variant detail page or contact us before designing your housing.
Yes. These gears follow the standard Module 1.5 involute tooth profile with a 20° pressure angle, making them directly compatible with any Module 1.5 rack or mating spur gear that uses the same standard. Always verify the pressure angle matches (20°) before pairing with third-party components.
#45 carbon steel (roughly equivalent to AISI 1045) has a tensile strength of approximately 600–800 MPa in its normalized state, making it suitable for moderate-to-heavy duty mechanical drives. For high-cycle or high-shock applications, consider whether additional heat treatment or a higher-alloy steel would be appropriate for your specific load conditions.
#45 carbon steel is not inherently corrosion-resistant. For environments with moisture, coolant exposure, or outdoor use, we recommend applying a light machine oil coating during storage and operation, or selecting a stainless-steel or surface-treated alternative. Contact us to confirm available finish options for your variant.
Yes. #45 carbon steel is machinable, so the bore can be enlarged or keyway-cut by a machine shop to match your shaft diameter. Ensure the remaining wall thickness after boring is sufficient for your torque load. Contact us to confirm the standard bore diameter for your selected tooth count before planning any machining.
These gears are well-suited for CNC router rack-and-pinion gantry drives, robotic joint reduction stages, 3D printer extruder or axis drives, conveyor indexing systems, and general-purpose no-step transmission assemblies where a standard metric module 1.5 spur gear is specified.
