Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When your motor shaft needs a dependable meshing partner, a mismatched or undersized gear becomes the weakest link in your entire drivetrain. Whether you are building a robot, a CNC axis, or a custom automation rig, these 1 module spur gears give hobbyists and engineers alike a ready-to-mount solution without the wait of custom machining.
Each gear is machined from 45# medium-carbon steel and features a stepped hub design for secure shaft retention. The module is 1 (metric), with tooth counts ranging from 12T to 52T and bore diameters from 5 mm (0.20 in) to 16 mm (0.63 in). Outer diameter scales with tooth count — from approximately 14 mm (0.55 in) on the 12T up to approximately 54 mm (2.13 in) on the 52T.
Typical use cases include DC motor pinion drives in wheeled robots, stepper-motor lead-screw couplings in desktop CNC machines, and gear-reduction stages in DIY conveyor or winch systems — all applications where a standard 1 mod pitch line keeps interchangeability simple.
Offers a solid balance of machinability and wear resistance, suitable for moderate-load power transmission in motors and drive systems.
The integrated step on the hub provides a positive axial stop against the motor face or bearing housing, reducing assembly time and improving concentricity.
Covers a broad gear-ratio spectrum in a single product family, letting you dial in the exact speed-torque trade-off your application needs.
Ten bore sizes accommodate the most common motor shaft diameters, from small hobby motors up to NEMA 23 stepper shafts.
Order a single gear for prototyping or a 3-pack for production builds and spares — both options ship from the same SKU family.
Meshes directly with any other Mod 1 spur gear, rack, or pinion, making it easy to source mating components from multiple suppliers.
| Module | 1 (Metric) |
|---|---|
| Material | 45# Medium-Carbon Steel |
| Tooth Count Range | 12T – 52T (see variant options) |
| Bore Diameter Range | 5 mm – 16 mm (see variant options) |
| Outer Diameter | See variant options |
| Hub Style | Stepped hub |
| Pressure Angle | 20° |
| Surface Finish | See variant options |
| Packing Quantity | 1 Pcs or 3 Pcs (see variant options) |
The gear ratio is determined by dividing the driven gear tooth count by the driving gear tooth count. For example, pairing a 12T pinion with a 36T gear gives a 3:1 reduction — tripling torque while cutting speed to one-third. Choose a smaller tooth count (12T–20T) for high-speed, lower-torque output, and a larger tooth count (40T–52T) when you need more torque at lower RPM.
Measure your motor or shaft diameter with a caliper and select the matching bore. Common motor shaft sizes: small DC hobby motors typically use 3–6 mm shafts; NEMA 17 steppers use 5 mm; NEMA 23 steppers use 6.35 mm or 8 mm. If your shaft is between sizes, choose the next bore up and use a set screw or keyway adapter to secure the gear.
45# steel provides good tensile strength (typically 600–800 MPa depending on heat treatment) and is widely used in moderate-load mechanical drives. For light-to-medium duty applications — hobby robots, desktop CNC, small conveyors — these gears are well suited. For heavy industrial loads or continuous high-speed operation, consider hardened or alloy-steel gears.
Yes. All gears in this listing follow the standard Mod 1 (1 mm module) metric pitch. They will mesh correctly with any other Mod 1 spur gear, helical gear (same helix angle), or rack from any manufacturer, as long as the pressure angle is also 20°.
For best longevity, apply a light machine grease or gear oil to the tooth faces before first use and re-lubricate periodically depending on load and duty cycle. In low-speed, light-load applications (e.g., slow-moving robots), dry running is possible for short periods, but lubrication significantly extends service life.
Both options ship the identical gear — the only difference is quantity. The 1-piece option is ideal for prototyping or replacing a single worn gear. The 3-piece pack offers a lower per-unit cost and is practical when building multiple identical assemblies or keeping spares on hand for maintenance.
The stepped hub design is intended to work with a set screw (not included) threaded radially into the hub. Drill and tap a set-screw hole in the hub if one is not pre-drilled, or use a shaft collar alongside the gear for a tool-free retention method. Always ensure the flat on the shaft aligns with the set screw for maximum holding force.
