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When your motion system demands tight tolerances and corrosion resistance, standard carbon steel gears fall short. Engineers, robotics builders, and CNC hobbyists working in humid, food-adjacent, or chemically exposed environments need a gear that holds its geometry under load without rusting out. These stainless steel spur gears with integrated hub are machined to DIN/ISO standards and available across four module sizes — Module 0.5, 1, 1.5, and 2 — covering tooth counts from 12 to 60 teeth.
Each gear is machined from 304 stainless steel, offering a tensile strength typically in the range of 515–620 MPa with good surface hardness after machining. The integrated hub design provides a secure shaft-mounting platform with a precision-bored center hole ranging from 4 mm (0.16 in) to 25 mm (0.98 in), with optional keyway configurations (4 mm, 5 mm, 6 mm, and 8 mm keyways) available on larger bore sizes. Outer diameters scale with module and tooth count — from approximately 11 mm (0.43 in) for a Mod 0.5 / 20T gear up to approximately 64 mm (2.52 in) for a Mod 2 / 30T gear.
Typical use cases include precision spur gear drives for desktop CNC router Z-axis assemblies, small robotic arm joint actuators requiring corrosion-resistant gear trains, and laboratory automation equipment where stainless steel spur gears with hub are required for cleanroom or washdown compatibility. The module-standardized tooth profile ensures direct meshing with any same-module rack, pinion, or mating gear in your drivetrain.
| Material | 304 Stainless Steel |
|---|---|
| Module Range | 0.5 / 1 / 1.5 / 2 |
| Tooth Count Range | 12 – 60 Teeth (varies by module) |
| Bore Diameter Range | 4 mm – 25 mm (see variant options) |
| Keyway Options | 4 mm, 5 mm, 6 mm, 8 mm (available on select bore sizes) |
| Tooth Profile | Standard Involute (20° pressure angle) |
| Outer Diameter | See variant options |
| Hub Style | Integrated hub with through-bore |
| Surface Finish | Machined (as-machined stainless) |
| Quantity per Order | 1 piece |
| Weight | See variant options |
Module size determines the tooth size and pitch diameter of the gear. Module 0.5 gears have smaller, finer teeth suited for low-torque, high-speed precision drives (e.g., camera sliders, small robots). Module 1 is a general-purpose size for light-duty CNC and automation. Module 1.5 and 2 have larger teeth that handle higher torque loads at lower speeds. Match the module of your gear to the module of any mating rack, pinion, or gear — mismatched modules will not mesh correctly.
Measure your shaft diameter precisely with calipers. Select the bore size that matches your shaft — a bore that is too large will cause runout and vibration. For applications with significant torque, choose a bore variant with a keyway (e.g., 12 mm + 4 mm Keyway) and use a matching key stock to prevent the gear from spinning on the shaft. For light-duty or positioning applications, a plain bore with a set screw is typically sufficient.
304 stainless steel has a typical tensile strength of 515–620 MPa and yield strength of approximately 205–310 MPa. These gears are suitable for light-to-medium duty power transmission. For heavy industrial loads or continuous high-torque applications, consider hardened steel or alloy steel gears. The integrated hub improves shaft engagement and reduces bending stress at the bore, which extends service life compared to hubless designs under the same load conditions.
Yes. 304 stainless steel provides good resistance to oxidation, moisture, and mild chemical exposure, making these gears suitable for food processing equipment, laboratory instruments, marine-adjacent environments, and outdoor automation systems. They are not recommended for prolonged exposure to chloride-rich environments (e.g., saltwater immersion) without additional protective measures, where 316 stainless steel would be more appropriate.
Yes, provided the mating component shares the same module number and uses a standard 20° pressure angle involute tooth profile — which is the global industry standard. A Module 1 gear will mesh with any Module 1 rack or pinion regardless of material or manufacturer. Do not attempt to mesh gears of different module sizes, as the tooth geometry is incompatible and will result in binding or rapid wear.
Your gear ratio is determined by the tooth count ratio between the driver and driven gear, not the module. For example, a 20-tooth driver meshing with a 40-tooth driven gear gives a 2:1 reduction regardless of module. Choose the module based on the torque and speed requirements of your application — larger modules handle more torque. Once the module is selected, choose tooth counts to achieve your target ratio. Use the available tooth count range (12–60 teeth across modules) to find combinations that fit your center distance constraints.
Yes. Each variant (module + tooth count + bore size combination) is listed separately. You can add multiple variants to your cart to configure a complete gear train — for example, a driver gear and a driven gear of the same module but different tooth counts. Each variant is sold as 1 piece per unit ordered; increase the quantity in your cart if you need multiples of the same variant.
