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When your CNC router, robotic arm, or motorized drive system demands consistent torque transfer and tight mesh accuracy, undersized or mismatched gears become an immediate bottleneck. Engineers, makers, and automation integrators working with Mod 1.5 gear trains need a reliable pinion gear that holds dimensional tolerances across repeated load cycles — without slop, wobble, or premature wear.
These Mod 1.5 pinion spur gears are machined from steel and cover a tooth range of 12T to 90T (skipping 79T), with corresponding outer diameters from approximately 21 mm (0.83 in) up to 138 mm (5.43 in). The flat gear profile follows standard Module 1.5 geometry, ensuring direct compatibility with any Mod 1.5 mating gear or rack in your drivetrain.
Typical applications include CNC spindle and axis drive systems requiring Mod 1.5 steel pinion gears, DC and stepper motor output shaft gearing for robotics and automation platforms, and DIY gearbox builds where a wide tooth-count selection is needed to achieve a specific gear ratio for motor flat gear assemblies.
Machined from steel for durability under continuous load, resisting deformation in high-torque motor drive and CNC axis applications.
Conforms to Module 1.5 gear geometry for direct mesh with any Mod 1.5 mating gear, rack, or pinion — no custom adaptation required.
78 tooth-count options (12T to 90T) let you dial in the exact gear ratio needed for your motor output shaft or intermediate drive stage.
Outer diameters scale predictably with tooth count, from compact 21 mm pinions for tight motor mounts up to 138 mm gears for large-format drive systems.
Straight-tooth spur gear profile delivers efficient parallel-axis power transmission with minimal axial thrust — ideal for motor-to-shaft and stage-drive configurations.
Suited for CNC routers, 3D printer extruder drives, robotic joints, conveyor systems, and custom gearbox builds requiring a Mod 1.5 steel pinion gear.
| Module (Mod) | 1.5 |
|---|---|
| Tooth Count Range | 12T – 90T (78 options; 79T not available) |
| Outer Diameter Range | 21 mm – 138 mm (0.83 in – 5.43 in) |
| Gear Type | Spur Gear (Flat / Straight Tooth) |
| Material | Steel |
| Pressure Angle | 20° (standard Mod 1.5) |
| Bore Diameter | See variant options |
| Hub / Face Width | See variant options |
| Finish / Treatment | See variant options |
| Shaft Fit | Contact us to confirm |
Determine your required gear ratio first: divide the driver tooth count by the driven tooth count. For example, a 20T pinion meshing with a 60T gear gives a 3:1 reduction. Select a tooth count from our 12T–90T range that achieves your target ratio while fitting within your available center-distance and OD envelope.
Module (Mod) is the standardized metric gear sizing system. Mod 1.5 means the pitch diameter equals 1.5 × tooth count in millimeters. These gears will mesh correctly with any other Mod 1.5 spur gear or rack, regardless of brand, as long as the pressure angle is also 20°.
Yes. Steel construction provides the tensile and shear strength needed for CNC router axis drives, stepper and servo motor pinions, and robotic joint gearing under continuous cyclic loads. For very high-speed or shock-load applications, confirm the specific steel grade meets your torque requirements.
Standard steel gears offer moderate corrosion resistance. For outdoor, humid, or washdown environments, consider applying a light machine oil or grease coating after installation. If your application requires stainless steel or a corrosion-resistant coating, please contact us to confirm availability for your tooth count.
Bore diameter varies by tooth count and is listed in the variant details. Measure your motor output shaft diameter (common sizes: 5 mm, 6 mm, 8 mm, 10 mm, 12 mm) and compare against the bore spec for your selected tooth count. If you need a custom bore or keyway, contact us before ordering.
Yes. Because all variants share the same Mod 1.5 profile, you can combine multiple tooth counts from this range to build multi-stage gear trains. Calculate the center distance for each mesh pair using: Center Distance = (T1 + T2) × 1.5 / 2, where T1 and T2 are the tooth counts of the meshing pair.
The 79T variant is not currently stocked in this Mod 1.5 steel spur gear series. The available range runs from 12T to 90T with 79T excluded. If you specifically require 79T, please contact us — we may be able to source it or suggest an alternative tooth count that achieves a similar gear ratio.
