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When your robotics project, CNC build, or motorized mechanism demands exact gear meshing and consistent torque transfer, mismatched or soft gears become an immediate bottleneck. These 1.5 Module spur gears are engineered for makers, hobbyists, and engineers who need a dependable pinion gear that holds up under real load — available in a wide tooth count range from 12T to 89T to match virtually any drive ratio requirement.
Each gear is machined from #45 carbon steel, offering a solid balance of hardness and machinability. The module is 1.5 (Mod 1.5), with a uniform face width (thickness) of 15mm (~0.59 in). Outer diameter scales with tooth count — ranging from approximately 21mm (~0.83 in) for the 12T up to approximately 136.5mm (~5.37 in) for the 89T. Bore diameter varies by variant; please refer to variant options for exact bore specifications.
Typical use cases include DC motor pinion drives in robotics and automation systems, lead screw and rack-and-pinion assemblies in DIY CNC routers, and gear reduction stages in custom electric vehicles, winches, and conveyor mechanisms. The 1.5 module pitch makes these gears compatible with any standard Mod 1.5 mating gear or rack.
Machined from #45 carbon steel for a reliable combination of tensile strength and wear resistance — suitable for moderate-to-high load drive applications.
Module 1.5 is a widely adopted metric gear standard, ensuring direct interchangeability with any Mod 1.5 rack, pinion, or mating spur gear in your drivetrain.
76 tooth count variants in a single product listing — dial in your exact gear ratio without sourcing from multiple suppliers or compromising on tooth count.
Uniform 15mm (0.59 in) gear thickness across all variants ensures predictable load distribution and straightforward alignment in multi-gear assemblies.
Designed as a motor pinion gear for direct mounting to motor output shafts in robotics, automation, and DIY electric drive systems. Bore size varies by variant — see options above.
Standard involute spur gear tooth geometry delivers consistent contact ratio, low noise operation, and efficient power transfer across the full tooth count range.
| Module (Mod) | 1.5 |
|---|---|
| Tooth Count Range | 12T – 89T (76 variants) |
| Face Width (Thickness) | 15mm (0.59 in) |
| Material | #45 Carbon Steel |
| Pressure Angle | 20° (standard involute) |
| Outer Diameter | See variant options (scales with tooth count) |
| Bore Diameter | See variant options |
| Pitch Diameter Formula | Mod × Tooth Count (e.g., 1.5 × 20T = 30mm PD) |
| Gear Type | Spur Gear (straight tooth) |
| Surface Finish | See variant options |
| Weight | See variant options |
Your gear ratio is determined by dividing the driven gear tooth count by the driving (pinion) gear tooth count. For example, pairing a 12T motor pinion with a 60T driven gear gives a 5:1 reduction. Select a tooth count that achieves your target ratio while keeping the center distance between shafts practical for your build. Use the pitch diameter formula (Mod × Teeth = PD in mm) to calculate center distance: (PD1 + PD2) ÷ 2.
Module (Mod) is the metric standard for gear tooth size — it equals the pitch diameter divided by the number of teeth. Mod 1.5 gears will only mesh correctly with other Mod 1.5 gears or racks with the same pressure angle (20°). They are not interchangeable with Mod 1.0, Mod 2.0, or imperial Diametral Pitch (DP) gears. Check your existing gear's module marking before ordering.
#45 carbon steel has a tensile strength of approximately 600–800 MPa, making these gears suitable for moderate-to-high torque applications in robotics, automation, and DIY electric drives. For very high shock loads or continuous heavy-duty industrial use, consider whether a heat-treated or alloy steel gear would better suit your requirements. Contact us to confirm load ratings for your specific application.
#45 carbon steel is not inherently corrosion resistant. For outdoor or humid environments, we recommend applying a light machine oil or grease coating during operation, and storing the gears in a dry location when not in use. If your application requires corrosion resistance, consider stainless steel or plastic gears instead, or apply a protective surface treatment after installation.
Bore diameter varies by tooth count variant. Select your desired tooth count from the variant dropdown above, then check the variant description or contact us to confirm the exact bore diameter. Measure your motor shaft diameter with a caliper before ordering. If the bore is slightly larger than your shaft, a shaft collar, set screw, or keyway adapter can be used to secure the gear.
Spur gears (like these) have straight teeth parallel to the gear axis. They are simpler to install, generate no axial thrust, and are ideal for most DIY and light-to-medium industrial applications. Helical gears have angled teeth that engage more gradually, resulting in quieter operation and higher load capacity, but they introduce axial forces that require thrust bearings. For most robotics, CNC, and maker projects, spur gears are the practical and cost-effective choice.
Yes — any of these Mod 1.5 spur gears will mesh with a standard Mod 1.5 gear rack to convert rotary motor motion into linear movement. This is a common setup for CNC router axes, linear actuators, and sliding door mechanisms. Ensure the rack is also rated Mod 1.5 with a 20° pressure angle for proper meshing. The pinion tooth count you select will affect your linear speed and force output.
