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When your build demands consistent torque transfer and dimensional accuracy, undersized or poorly finished gears become the weakest link in the drivetrain. Whether you are a robotics engineer, a CNC hobbyist, or a maker assembling a custom gearbox, these Modul 1.5 spur gears give you the precision and durability your project requires — available in a wide range of tooth counts and bore sizes so you can match the gear exactly to your shaft.
Each gear is machined to a Module 1.5 standard, covering 12 to 50 teeth and bore diameters from 5 mm (0.197 in) to 25 mm (0.984 in). The gear body is hardened steel, finished with a smooth tooth profile for low-noise meshing. A radial set screw is included with every gear to secure it firmly to the shaft without additional hardware.
These modul 1.5 pinion gears are well suited for small-to-medium DC motor gearboxes, 3D printer extruder drives, automated sliding door mechanisms, and DIY robotic arm joints — anywhere a compact, hardened spur gear with a standard metric module is needed for long-term, repeatable motion.
| Module | 1.5 |
|---|---|
| Tooth Count Options | 12, 15, 20, 25, 30, 35, 40, 50 Teeth |
| Bore Diameter Options | 5, 6, 6.35, 7, 8, 10, 12, 14, 15, 16, 17, 20, 25 mm |
| Pressure Angle | 20° |
| Material | Hardened Steel |
| Finish | See variant options |
| Pitch Diameter | 18 mm – 75 mm (varies by tooth count) |
| Hub Fastening | Radial Set Screw (included) |
| Shaft Compatibility | 5–25 mm metric / 6.35 mm (1/4 in) imperial |
| Quantity per Order | 1 Pcs (per variant selected) |
| Weight | See variant options |
The gear ratio between two meshing gears equals the ratio of their tooth counts. For example, pairing a 12-tooth pinion with a 24-tooth gear gives a 2:1 reduction. Choose a lower tooth count (12–20) for higher speed output and a higher tooth count (30–50) when you need more torque at lower RPM. Match the module (1.5) on both gears to ensure correct meshing.
Measure your shaft diameter with a caliper and select the matching bore. Common sizes: 5 mm and 6 mm for small DC motors, 6.35 mm (1/4 in) for North American standard shafts, 8 mm and 10 mm for NEMA 23/34 stepper motors, and 12–25 mm for larger servo or gearbox output shafts. The included set screw locks the gear securely once positioned.
Yes. The gears are made from hardened steel, which significantly increases surface hardness and fatigue resistance compared to unhardened mild steel. They are suitable for continuous-duty light-to-medium industrial and maker applications. For very high shock loads or extreme RPM, consult the torque rating of your specific tooth count and bore combination.
Yes — any gear or rack manufactured to the Module 1.5 standard with a 20° pressure angle will mesh correctly with these gears. Module (pitch) must match between mating components; mixing Module 1.0 or Module 2.0 parts with these gears will result in incorrect meshing and accelerated wear.
No keyway is required. Each gear includes a radial set screw that clamps directly onto the shaft. For higher-torque applications, you can apply a small amount of thread-locking compound to the set screw or use a shaft with a flat (D-cut) to improve grip. If your application demands a keyed connection, Contact us to confirm availability of keyed-bore variants.
Hardened steel gears are not inherently corrosion-resistant. For outdoor or high-humidity environments, apply a light machine oil or grease to the tooth faces and bore after installation. If long-term corrosion resistance is critical, consider stainless steel or plastic gear alternatives for your application.
With Module 1.5, the pitch diameter equals the tooth count multiplied by the module. The 12-tooth gear has a pitch diameter of 18 mm (~0.71 in), while the 50-tooth gear has a pitch diameter of 75 mm (~2.95 in). Choose based on the available space in your gearbox housing and the center distance between your shafts.
