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When a slipping or undersized gear throws off your entire build, the cost is not just the part — it is the downtime. Hobbyists, robotics engineers, and small-scale machine builders who need dimensionally consistent, hard-tooth pinion gears will find this module 1 spur gear a dependable foundation for any gear-driven mechanism.
Each gear is machined from 45 carbon steel with a hardened tooth surface, available in tooth counts from 31T to 120T and bore diameters of 6 mm (0.24 in), 8 mm (0.31 in), 10 mm (0.39 in), 12 mm (0.47 in), 14 mm (0.55 in), and 15 mm (0.59 in). The module 1 pitch standard ensures direct interchangeability with any other module 1 component in your drivetrain.
Typical use cases include compact robotic arm joints requiring a module 1 spur gear with 6 mm bore, CNC router axis drives using a 40T-60T steel pinion gear, and DIY automation projects that need a hard-tooth module 1 gear set with matched bore-to-shaft fit.
Machined from 45 steel for a balance of toughness and machinability, suitable for moderate-to-high load drive applications.
Tooth flanks are surface-hardened to resist wear and pitting, extending service life in continuous-duty or high-cycle mechanisms.
Module 1 pitch is one of the most common metric gear standards, making these pinions directly compatible with a broad range of off-the-shelf gears and racks.
Eighteen tooth-count options let you dial in the exact gear ratio your application requires without custom machining.
Six bore options — 6, 8, 10, 12, 14, and 15 mm — cover the most common shaft diameters used in hobby motors, stepper motors, and servo shafts.
Each variant ships as a single gear, so you can mix tooth counts and bores to build exactly the gear train you need without paying for extras.
| Gear Standard (Module) | Module 1 (m1) |
|---|---|
| Material | 45 Carbon Steel |
| Tooth Profile | Hard Tooth (surface-hardened) |
| Pressure Angle | 20° |
| Tooth Count Options | 31T, 32T, 34T, 35T, 36T, 37T, 38T, 39T, 40T, 42T, 45T, 50T, 55T, 60T, 70T, 80T, 100T, 120T |
| Bore Diameter Options | 6 mm / 8 mm / 10 mm / 12 mm / 14 mm / 15 mm |
| Pitch Diameter | See variant options |
| Outside Diameter | See variant options |
| Face Width | See variant options |
| Hub Diameter | See variant options |
| Keyway | See variant options |
| Finish | Natural steel / lightly oiled |
| Quantity per Order | 1 piece |
Gear ratio = driven teeth divided by driving teeth. Pairing a 31T pinion with a 62T gear gives a 2:1 reduction. The module 1 standard means any two module 1 gears will mesh correctly regardless of tooth count.
Measure your shaft diameter with calipers before ordering. Common stepper motor shafts are 5 mm or 8 mm; hobby DC motors often use 3-6 mm shafts. Contact us to confirm if you are unsure.
Hard-tooth gears have their tooth flanks surface-hardened after machining, creating a wear-resistant outer layer while keeping the core tough. This resists pitting and surface fatigue under repeated load cycles.
45 carbon steel has a tensile strength of approximately 600-800 MPa in normalized condition, suitable for moderate-to-high load gear applications including robotics, CNC, and general automation at hobby-to-light-industrial torque levels.
45 carbon steel is not inherently corrosion-resistant. The gears are finished with a light oil coating. For humid or wet environments, apply a gear lubricant or grease during installation and re-apply periodically.
Yes. Any module 1 spur gear from this listing will mesh correctly with a module 1 rack at 20 degree pressure angle. Suitable for CNC machines, camera sliders, and linear motion builds.
Center distance = (Teeth A + Teeth B) x Module divided by 2. For a 40T and 60T module 1 pair: (40 + 60) x 1 / 2 = 50 mm center distance.
