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When a slipping or mismatched gear brings your build to a halt, you need a replacement you can trust. Whether you're a robotics hobbyist, a CNC builder, or a mechanical engineer prototyping a drive system, finding a spur gear with the right bore and keyslot combination shouldn't be a compromise. This Mod 1.5 steel spur gear with 24 teeth is designed for builders who need precision, strength, and a secure shaft fit — right out of the box.
This spur gear is machined from carbon steel, offering a solid balance of hardness and machinability. The gear follows the Mod 1.5 (Module 1.5) standard, with 24 teeth and an outer diameter of approximately 39 mm (≈1.54 in). Bore sizes range from 10 mm to 15 mm (0.39 in – 0.59 in), and keyslot options of 4×1.8 mm or 5×2.3 mm allow for a positive, non-slip shaft connection.
Typical use cases include DC motor output shafts in robotics and automation rigs, gearbox reduction stages in CNC router builds, and custom transmission assemblies in go-karts, electric bikes, or maker projects requiring a compact Mod 1.5 pinion gear with keyway.
| Module (Mod) | 1.5 |
|---|---|
| Number of Teeth | 24 |
| Outer Diameter (OD) | Approx. 39 mm (≈1.54 in) |
| Bore Diameter | 10 mm / 12 mm / 12.7 mm / 14 mm / 15 mm — See variant options |
| Keyslot Dimensions | 4×1.8 mm or 5×2.3 mm — See variant options |
| Material | Carbon Steel |
| Finish | See variant options |
| Face Width | See variant options |
| Pressure Angle | 20° |
| Gear Type | Spur Gear (Pinion) |
| Tooth Profile | Involute |
| Weight | See variant options |
Measure your motor or drive shaft diameter with a caliper. Select the bore size that matches exactly — available options are 10 mm, 12 mm, 12.7 mm (1/2 in), 14 mm, and 15 mm. A bore that is too large will cause shaft slippage even with a keyslot; a bore that is too small cannot be fitted without machining.
The keyslot size must match the key and keyway already cut into your shaft. The 4×1.8 mm keyslot is typically paired with smaller bore shafts (10–12 mm), while the 5×2.3 mm keyslot suits larger bore shafts (12.7–15 mm). Check your shaft specification or motor datasheet to confirm the correct key size before ordering.
Yes — any gear following the Module 1.5 (M1.5) standard with a matching pressure angle of 20° will mesh correctly with this spur gear. Confirm that your mating gear is also M1.5 and not a similar-looking but incompatible pitch (such as 16 DP or 18 DP imperial pitch gears).
This gear is machined from carbon steel, which provides good tensile strength and wear resistance for mechanical drive applications. It is suitable for moderate-to-high torque robotics, CNC, and automation builds. For extreme shock-load or very high-speed applications, consider whether a heat-treated or alloy steel variant better suits your requirements. Contact us to confirm if you have specific load data.
Carbon steel has limited inherent corrosion resistance. For outdoor, humid, or wet environments, we recommend applying a light machine oil or grease coating during installation and periodically during service. If your application requires inherent corrosion resistance, consider a stainless steel or plastic gear alternative.
For a Mod 1.5 gear with 24 teeth, the theoretical outer diameter (tip diameter) is approximately 39 mm (≈1.54 in), calculated as (teeth + 2) × module = 26 × 1.5. Face width follows standard Mod 1.5 proportions; please contact us or refer to the product images for the exact face width of the specific variant you need.
Yes. This 24-tooth Mod 1.5 spur gear is well-suited as a pinion (driving gear) in a reduction gearbox. Pair it with a larger Mod 1.5 spur gear to achieve your desired gear ratio. For example, pairing with a 48-tooth gear gives a 2:1 reduction. Ensure center distance between shafts is calculated correctly for the module and tooth counts used.
