Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When your motor shaft needs a reliable, slip-resistant gear interface, a loose-fitting or undersized pinion creates backlash, vibration, and premature wear. These Mod 1.5 spur gear motor pinion gears with step hub are engineered for hobbyists, robotics builders, CNC enthusiasts, and small-machine designers who demand dimensional accuracy and repeatable performance from every drive component.
Each pinion is machined from steel and features a stepped hub design that provides a positive axial stop for secure shaft positioning. The module (Mod) is 1.5, with tooth counts ranging from 12T to 50T and bore diameters spanning 5 mm to 25 mm (approximately 0.197 in to 0.984 in). Gear outer diameters range from approximately 21 mm (12T) to 78 mm (50T), with a face width typically 10–15 mm depending on the model selected.
Typical use cases include DC motor pinion replacement in tabletop CNC routers, servo drive stages in robotic arms, and reduction gear trains in automated dispensing or conveyor systems — all applications where a compact Mod 1.5 spur gear pinion with step hub delivers consistent mesh quality and long service life.
The integrated step hub provides a positive axial reference surface, keeping the gear precisely located on the motor shaft and reducing axial float during operation.
Eight tooth-count options (12T, 15T, 20T, 25T, 30T, 35T, 40T, 50T) let you dial in the exact gear ratio your drive system requires without custom machining.
Bore options from 5 mm to 25 mm (including 6 mm, 6.35 mm, 7 mm, 8 mm, 10 mm, 12 mm, 14 mm, 15 mm, 16 mm, 17 mm, 20 mm, and 25 mm) cover the most common DC and stepper motor shaft diameters.
Conforms to the ISO/DIN Mod 1.5 involute tooth standard, ensuring correct mesh with any off-the-shelf Mod 1.5 mating gear or rack without profile modification.
Available in packs of 1, 2, 3, or 5 pieces per order, so you can stock spares or equip multiple axes without over-ordering.
The standard "No quenching" treatment retains machinability, making it straightforward to add a keyway, set-screw flat, or custom bore enlargement in a lathe or mill.
| Module (Mod) | 1.5 |
|---|---|
| Tooth Count Options | 12T, 15T, 20T, 25T, 30T, 35T, 40T, 50T |
| Bore Diameter Options | 5, 6, 6.35, 7, 8, 10, 12, 14, 15, 16, 17, 20, 25 mm |
| Pressure Angle | 20° (standard involute) |
| Outer Diameter (approx.) | 21 mm (12T) – 78 mm (50T) |
| Face Width | See variant options |
| Hub Style | Stepped hub |
| Material | Steel |
| Surface Treatment | No quenching (as-machined) |
| Pack Quantity | 1 / 2 / 3 / 5 pcs (select above) |
| Weight (per piece) | See variant options |
The tooth count determines your gear ratio when paired with a mating gear. Divide the driven gear's tooth count by the pinion's tooth count to get the reduction ratio. For example, a 12T pinion driving a 60T gear gives a 5:1 reduction. Lower tooth counts (12T–20T) suit high-reduction, high-torque stages; higher counts (30T–50T) are used for lower-ratio or near-1:1 drives.
Measure your motor shaft diameter with a caliper and select the matching bore. Common DC motor shafts are 5 mm, 6 mm, or 8 mm; stepper motors often use 5 mm or 6.35 mm (1/4 in); servo and larger gear motors may use 8 mm, 10 mm, or 12 mm. If your shaft is between listed sizes, choose the next size up and plan to bore or ream to final dimension.
These steel Mod 1.5 pinions are suitable for moderate-torque, intermittent-to-continuous duty in hobbyist and light industrial applications. For very high torque or shock-load environments, consider adding a set-screw or keyway to the bore, and verify that the mating gear material and face width are matched to your load requirements.
The standard no-quenching steel finish offers basic corrosion resistance suitable for indoor, dry environments. For humid or outdoor use, apply a light machine oil or grease to the gear teeth and bore after installation. If corrosion resistance is critical, consider stainless steel or plastic alternatives for your application.
Yes — as long as your mating gear or rack is also Mod 1.5 with a 20° pressure angle (the international standard), these pinions will mesh correctly. Confirm the module and pressure angle of your existing components before ordering. Mod 1.5 is not interchangeable with Mod 1, Mod 2, or DP (diametral pitch) gears.
"No quenching" means the gear is supplied in an as-machined, un-hardened state. This makes the material easier to machine — you can drill, ream, or mill a keyway without special tooling. Hardened gears offer higher surface hardness and wear resistance but are more difficult to modify. For most hobbyist and light-duty applications, no-quenching steel provides adequate strength and long service life.
Absolutely. Each variant is available in a pack of 1 piece, so you can verify fit, mesh quality, and dimensional accuracy before committing to larger quantities. Multi-pack options (2, 3, or 5 pcs) are available for the same model and bore combination at a lower per-piece cost.
