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When a stripped or undersized pinion gear stalls your project, every minute of downtime costs you. Whether you're a robotics engineer dialing in a drive train, an RC hobbyist pushing lap times, or a maker building a custom CNC axis, you need a pinion gear that holds its mesh under load without slipping or wearing prematurely. This 10-tooth Mod1 steel pinion gear is engineered for exactly those demands.
Each gear is machined from carbon steel with a straight-tooth (spur) profile and a Module 1 (Mod1) pitch standard. The bore options — 4 mm (~0.157 in) and 5 mm (~0.197 in) — are secured by an included set screw, allowing firm shaft engagement without adhesives. Gear outer diameter is approximately 12 mm (~0.47 in), with a face width typically in the 10–12 mm range depending on variant.
Typical use cases include: RC car and truck motor pinion replacement, small robotic joint actuators requiring a compact 10T drive gear, and DIY CNC or 3D-printer extruder motor coupling where a Mod1 spur gear standard is specified.
Includes a grub/set screw for positive shaft locking — no adhesive required, easy to reposition or swap.
Standard Module 1 pitch ensures accurate mesh with any Mod1 rack, spur, or helical mating gear in your drivetrain.
Machined from carbon steel for solid load-bearing capacity and resistance to deformation under repeated torque cycles.
Available in 4 mm and 5 mm bore diameters to match the most common small motor shaft sizes without adapters.
Order 1, 2, 5, 10, or 20 pieces — stock up for prototyping runs or keep spares on hand for field repairs.
10-tooth count delivers a high gear ratio when paired with larger driven gears, ideal for torque multiplication in tight spaces.
| Number of Teeth | 10T |
|---|---|
| Module (Pitch) | Mod1 (Module 1) |
| Tooth Profile | Straight-tooth spur |
| Material | Carbon steel |
| Bore Diameter | 4 mm or 5 mm (see variant options) |
| Outer Diameter (approx.) | ~12 mm (~0.47 in) |
| Face Width (approx.) | Typically 10–12 mm |
| Shaft Retention | Set screw (included) |
| Finish | See variant options |
| Pack Quantity | 1 / 2 / 5 / 10 / 20 PCS (see variant options) |
| Pressure Angle | 20° (standard Mod1) |
Measure your motor output shaft diameter with a caliper. If it measures 4 mm, select the 4 mm bore variant; if it measures 5 mm, select the 5 mm bore variant. The included set screw clamps the gear firmly onto the shaft, so an exact bore-to-shaft match is important for concentricity and minimal runout.
"Mod1" refers to Module 1, a metric gear pitch standard where the tooth size is defined by a 1 mm module. This gear will mesh correctly with any other Mod1 spur gear, rack, or compatible helical gear. It will NOT mesh with Mod0.5, Mod0.8, or imperial diametral-pitch gears — always confirm your mating gear's module before ordering.
Yes. The carbon steel construction provides solid shear strength for typical RC motor pinion loads and light robotic joint applications. For high-shock or continuous heavy-load industrial use, consider a hardened steel or alloy steel variant. For most hobby RC and robotics builds, this gear handles the torque demands reliably.
Carbon steel has moderate corrosion resistance. For indoor or dry-environment use (RC cars, robotics, CNC), it performs well without additional treatment. If used in humid or outdoor environments, applying a light machine oil or anti-corrosion spray after installation is recommended to extend service life.
Yes, provided your brushless motor shaft is 4 mm or 5 mm in diameter and your drivetrain uses Mod1 gearing. Confirm the motor shaft diameter and the module of your spur/ring gear before purchasing. The set screw secures the pinion at your desired mesh position.
Pinion gears are wear items — especially in high-RPM RC and robotics applications. Having 2, 5, or 10 spares on hand means you can swap a worn gear in minutes rather than waiting for a reorder. Multi-pack pricing also reduces the per-unit cost significantly compared to buying singles repeatedly.
You'll need a hex key (Allen wrench) sized for the set screw — typically 1.5 mm or 2 mm. Slide the gear onto the motor shaft, position it at the correct mesh depth, then tighten the set screw firmly. No press-fit tools or adhesives are required.
