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When a stripped or undersized gear brings your build to a halt, every minute of downtime costs you. Whether you are a robotics engineer, a CNC hobbyist, or a small-batch automation builder, finding a dimensionally accurate, corrosion-resistant spur gear in the exact tooth count you need should not be a project in itself. These Module 1 stainless steel spur gears are stocked across a wide range of tooth counts and bore sizes so you can source the right pinion without compromise.
Each gear is machined from stainless steel to Module 1 (1 mm/tooth pitch) specification. The tooth range spans 12 to 120 teeth, covering pitch diameters from approximately 12 mm (0.47 in) up to 120 mm (4.72 in). Bore options run from 6 mm plain bore through to 18 mm with a 6 mm keyway, with intermediate keyway sizes at 8, 10, 12, 14, 15, 16, and 17 mm, giving you a secure shaft fit without custom machining.
Typical use cases include motor pinion drives in desktop CNC routers, rack-and-pinion linear actuators for 3D printer gantries, and gear-reduction stages in small conveyor or pick-and-place automation. The stainless steel construction also suits food-adjacent or humid-environment applications where mild steel would corrode.
Covers small motor pinions up to large driven gears in a single product family, reducing the number of suppliers you need to manage.
Plain 6 mm bore for small shafts; keyed bores from 8 mm to 18 mm for positive torque transmission without set-screw slip.
Resists oxidation in humid, washdown, or lightly corrosive environments where carbon steel gears would degrade over time.
Machined to Module 1 (1 mm circular pitch per tooth), ensuring accurate mesh with any standard M1 rack or mating gear.
Spur (flat) tooth geometry transmits power efficiently in parallel-shaft arrangements, keeping your drivetrain compact and predictable.
Available in 1 pc increments so you can replace a single failed gear or prototype a new drive stage without committing to bulk quantities.
| Module | 1 (1 mm/tooth) |
|---|---|
| Tooth Count Range | 12 – 120 teeth |
| Pitch Diameter Range | 12 mm – 120 mm (0.47 in – 4.72 in) |
| Pressure Angle | 20° (standard) |
| Material | Stainless Steel |
| Bore Size Options | 6 mm plain; 8, 10, 12, 14, 15, 16, 17, 18 mm with keyway |
| Keyway Dimensions | See variant options |
| Face Width | See variant options |
| Surface Finish | See variant options |
| Gear Type | External Spur Gear (Flat / Pinion) |
| Application | CNC, robotics, automation, 3D printers, conveyor drives |
| Quantity per Order | 1 pc |
The tooth count determines the pitch diameter (Tooth Count × Module = Pitch Diameter in mm). For a motor pinion, choose a smaller tooth count (12–20T) to achieve speed reduction when paired with a larger driven gear. For direct-drive or low-reduction stages, a higher tooth count (30T+) reduces tooth load and noise. Match the gear ratio to your required output speed and torque.
Measure your motor or shaft diameter precisely with calipers. Select the bore that matches your shaft OD. If your shaft has a keyway, choose the corresponding keyed bore option (e.g., 8 mm + 3 mm Keyway for an 8 mm keyed shaft). A plain 6 mm bore is suitable for smooth shafts secured with a set screw or adhesive.
Stainless steel Module 1 spur gears are well-suited for light-to-medium duty applications typical of CNC routers, 3D printers, and small automation systems. For heavy industrial loads or shock loading, consult a gear strength calculation (Lewis equation) using the specific face width and material yield strength. Contact us to confirm specifications if you have a demanding application.
Stainless steel offers significantly better corrosion resistance than carbon steel or mild steel gears. These gears are suitable for humid workshops, light washdown environments, and food-adjacent machinery where occasional moisture exposure is expected. For continuous immersion or aggressive chemical exposure, additional sealing or a different alloy may be required.
Yes. Any Module 1 gear or rack with a matching pressure angle (standard 20°) will mesh correctly with these gears regardless of material or brand. Confirm the pressure angle of your existing components before ordering if you are unsure.
A plain bore relies on a set screw or interference fit to transmit torque — suitable for low-torque or prototype applications. A keyed bore includes a machined slot (keyway) that accepts a key inserted into a matching slot on the shaft, providing a positive mechanical connection that prevents rotational slip under higher torque loads. For motor-driven applications, a keyed bore is generally recommended.
These gears are available in single-piece (1 pc) quantities. This makes them ideal for prototyping, replacement of a single worn gear, or small-batch builds where you only need one or a few pieces of a specific tooth count and bore combination.
