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When your machine demands consistent torque transfer and minimal backlash, a poorly matched gear becomes the weakest link in the entire drivetrain. Engineers, machinists, and serious hobbyists working on CNC routers, automation rigs, and custom gearboxes need a cylindrical spur gear that holds tight tolerances without compromise. This 2M 82-tooth spur gear is designed for exactly those applications.
This spur gear is machined from 45# medium-carbon steel, offering a strong balance of hardness and machinability. It features a Module 2 tooth profile with 82 teeth, a circular pitch of 6.28mm (approximately 0.247 in), and a face width (thickness) of 20mm (approximately 0.787 in). The outer diameter measures approximately 168mm (6.61 in), and the bore diameter is available in multiple sizes — see variant options for your required bore.
Typical use cases include CNC router axis drives requiring a 2M gear rack pairing, rotary indexing tables in light industrial automation, and custom gearbox builds for robotics and maker projects where a large-tooth-count spur gear reduces speed while multiplying torque.
| Module | 2 (M2) |
|---|---|
| Number of Teeth | 82T |
| Circular Pitch | 6.28mm (0.247 in) |
| Outer Diameter | Approx. 168mm (6.61 in) |
| Face Width (Thickness) | 20mm (0.787 in) |
| Bore Diameter | See variant options |
| Keyway | See variant options |
| Material | 45# Medium-Carbon Steel |
| Finish | Natural / Lightly Oiled |
| Pressure Angle | 20° |
| Gear Type | Cylindrical Spur Gear |
| Tooth Profile Standard | Module (ISO) |
Measure your shaft's outer diameter with a caliper. Select the bore size from the variant options that matches your shaft OD. If you need a keyway or set-screw hole, check the variant description or contact us to confirm availability for your required bore size.
The 45# steel construction and 20mm face width make this gear suitable for moderate continuous loads typical of CNC drives, light automation, and robotics. For heavy-duty or high-shock applications, consider a hardened or alloy steel variant. Exact load ratings depend on operating speed, lubrication, and mounting precision.
45# carbon steel offers good mechanical strength but moderate corrosion resistance. For outdoor or humid environments, apply a light machine oil or grease coating during installation and maintain regular lubrication. For highly corrosive environments, consider stainless steel alternatives.
Yes — any gear or rack with a Module 2 (M2) tooth profile and a 20° pressure angle will mesh correctly with this gear. Confirm that your mating component uses the ISO Module standard (not DP/diametral pitch) before ordering.
Divide the tooth counts: pairing with a 10T pinion gives an 8.2:1 ratio; a 20T pinion gives 4.1:1; a 41T pinion gives 2:1. The 82-tooth count offers flexible ratio options for speed reduction applications.
Yes. Apply a suitable gear grease or machine oil to the tooth flanks during installation and re-lubricate at regular service intervals. Proper lubrication reduces wear, lowers operating temperature, and significantly extends gear life.
Yes, cylindrical spur gears operate in any orientation. In vertical installations, ensure adequate lubrication retention — a grease-type lubricant is preferred over oil to prevent drip-off from the tooth faces.
