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When a stripped or undersized gear brings your motor drive, conveyor, or robotics project to a halt, you need a replacement that fits exactly right the first time. These Module 2 stainless steel spur gears are engineered for makers, mechanical engineers, and DIY builders who demand dimensional accuracy and corrosion resistance in a single, ready-to-install component.
Each gear is machined from stainless steel to Module 2 (2mm/tooth pitch) specification, with tooth counts ranging from 15 to 30 teeth and bore sizes from 8mm (0.31 in) to 25mm (0.98 in), all supplied with a precision-cut keyway for positive shaft engagement. Outer diameters scale from approximately 34mm (1.34 in) for the 15-tooth variant up to approximately 64mm (2.52 in) for the 30-tooth variant.
Typical applications include DC motor pinion drives in robotics and automation, CNC axis drive trains requiring a module 2 stainless steel pinion gear, and general-purpose power transmission in food-processing or wet environments where a corrosion-resistant spur gear is essential.
| Module | 2 (m = 2) |
|---|---|
| Tooth Count | 15 / 16 / 18 / 20 / 22 / 24 / 25 / 28 / 30 Teeth |
| Material | Stainless Steel |
| Bore Size | 8mm – 25mm (see variant options) |
| Keyway Width | 3mm – 8mm (matched to bore; see variant options) |
| Outer Diameter (approx.) | ~34mm – ~64mm (scales with tooth count) |
| Tooth Profile | Involute, 20° Pressure Angle |
| Gear Face Width | See variant options |
| Finish | Natural stainless (uncoated) |
| Quantity per Order | 1 pcs (single gear) |
The tooth count determines your gear ratio. Divide the driven gear's tooth count by the driving gear's tooth count to get the ratio. For example, pairing a 15-tooth pinion with a 30-tooth gear gives a 2:1 reduction. Choose a tooth count that achieves your target speed or torque ratio while keeping the outer diameter within your housing clearance.
Measure your motor or gearbox output shaft diameter with a caliper. Select the bore size that matches your shaft exactly — for example, a 12mm shaft requires the "12mm + 4mm Keyway" option. The keyway width is pre-matched to each bore size, so no additional machining is needed if your shaft has a standard keyway.
Stainless steel offers good tensile strength suitable for moderate-to-high torque applications in Module 2 drives. For very high shock-load or heavy industrial duty cycles, verify the calculated tangential load against the gear's face width and material yield strength. These gears are well-suited for robotics, CNC, and light-to-medium industrial drives.
Yes. Stainless steel provides inherent corrosion resistance without additional coatings, making these gears suitable for food-processing equipment, marine-adjacent environments, and outdoor machinery where moisture exposure is a concern. For highly aggressive chemical environments, confirm compatibility with your specific media.
These gears will mesh correctly with any Module 2 spur rack or mating spur gear. They are not designed to mesh with worm gears, bevel gears, or gears of a different module. Always confirm the mating component is also Module 2 before ordering.
For a Module 2 gear, the pitch diameter equals 2 × tooth count (in mm). A 15-tooth gear has a ~30mm pitch diameter; a 30-tooth gear has a ~60mm pitch diameter. The outer (tip) diameter adds approximately 4mm (one module on each side), so the 15T gear is roughly 34mm OD and the 30T gear is roughly 64mm OD. Choose based on your housing space and the gear ratio you need.
The gear is supplied with a precision-machined keyway bore, but the key (the small rectangular metal piece that fits the keyway) is not included. Standard metric keys matching each keyway width are widely available at hardware and engineering suppliers. Refer to the bore option name for the keyway width (e.g., "12mm + 4mm Keyway" uses a 4mm-wide key).
