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When a slipping or undersized gear brings your CNC router, robotic arm, or conveyor drive to a halt, you need a replacement that fits right the first time. These 1.5 module spur gears are engineered for makers, machine builders, and automation integrators who demand dimensional accuracy and consistent torque transmission across a wide range of tooth counts.
Each gear is machined from 45# medium-carbon steel, delivering a solid balance of strength and machinability. The 1.5 module (Mod 1.5) tooth profile covers tooth counts from 12T to 100T, with corresponding outer diameters ranging from approximately 21 mm (0.83 in) to 153 mm (6.02 in). Bore diameter and keyway dimensions vary by tooth count — see variant options for exact bore specs.
Typical applications include CNC rack-and-pinion linear drives, stepper and servo motor output shafts in 3D printers and laser cutters, gearbox reduction stages in robotics platforms, and light industrial conveyor or indexing mechanisms requiring reliable 1.5 mod gear mesh.
Medium-carbon 45# steel provides reliable tensile strength and wear resistance for continuous-duty gear mesh in CNC and automation applications.
58 size variants from 12 to 100 teeth let you dial in the exact gear ratio and pitch diameter your drive system requires without custom machining.
Conforms to the ISO/DIN Module 1.5 standard with a 20° pressure angle, ensuring drop-in mesh compatibility with off-the-shelf Mod 1.5 racks and mating gears.
Hobbed tooth flanks deliver smooth, low-noise engagement and consistent pitch accuracy across the full face width — critical for servo-driven positioning systems.
Each gear ships with a finished center bore sized to the tooth count. Bore diameter and hub dimensions are listed per variant — select your size above to confirm fit.
Available individually so you can replace a single worn pinion or prototype a new gear stage without committing to bulk quantities.
| Module (Mod) | 1.5 |
|---|---|
| Pressure Angle | 20° |
| Tooth Count Range | 12T – 100T (58 variants) |
| Outer Diameter Range | 21 mm – 153 mm (0.83 in – 6.02 in) |
| Material | 45# Medium-Carbon Steel |
| Tooth Form | Involute, hobbed |
| Bore Diameter | See variant options |
| Hub / Face Width | See variant options |
| Surface Finish | See variant options |
| Quantity per Order | 1 piece |
Select the tooth count based on your required gear ratio and available center distance. For a given ratio, divide the driven gear teeth by the driver gear teeth. The outer diameter of a Mod 1.5 gear is approximately (Teeth + 2) × 1.5 mm, so you can calculate center distance as (Driver OD + Driven OD) / 2 before ordering.
45# medium-carbon steel typically has a tensile strength of approximately 600–800 MPa in the normalized condition. This is suitable for light-to-medium duty CNC, robotics, and automation drives. For high-shock or heavy-load applications, consider heat-treated or alloy steel gears.
45# steel is not inherently corrosion-resistant. For humid or outdoor environments, we recommend applying a light machine oil or grease coating during operation, or selecting a stainless steel or surface-treated gear if long-term corrosion resistance is required.
Yes — as long as your existing rack or mating gear is also Mod 1.5 with a 20° pressure angle, these gears will mesh correctly. Module and pressure angle must match between mating gears. These gears are not compatible with Mod 1.0, Mod 2.0, or imperial diametral pitch (DP) systems.
Bore diameter varies by tooth count. Please check the specific variant listing or contact us to confirm the bore size for your selected tooth count before ordering. If the standard bore is too small, the gear can typically be re-bored by a local machine shop to your required shaft diameter.
Yes. Mod 1.5 spur gears are commonly used in stepper and servo motor drive stages for 3D printers, laser cutters, and CNC routers. Verify that your existing drive components use Mod 1.5 / 20° pressure angle, then select the tooth count that matches your current gear or desired ratio.
A light gear oil (ISO VG 68–150) or lithium-based grease is suitable for most applications. For high-speed or precision positioning systems, use a low-viscosity synthetic gear oil to minimize heat buildup and maintain tooth surface accuracy.
