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When a noisy, imprecise gear train is holding back your project — whether it's a robotic arm, a motorized camera slider, or a compact automation mechanism — the right pinion gear makes all the difference. This carbon steel helical pinion gear is designed for makers, engineers, and hobbyists who need reliable torque transfer in tight spaces without the rattle and backlash of lower-grade components.
Each gear is machined from carbon steel and features a helical tooth profile at 0.5 module (M0.5) with 14 teeth and a 2.9mm (approximately 0.114 in) bore diameter. The overall gear width is typically 5–8mm (0.20–0.31 in), making it well-suited for compact drive trains. Available in packs of 1, 5, or 10 pieces to match your project scale.
Typical applications include DIY robotics and servo-driven mechanisms, RC vehicle gearboxes requiring low-noise helical mesh, compact stepper motor drive stages, and small-scale automation or 3D printer extruder assemblies — all scenarios where a helical gear's gradual tooth engagement reduces vibration and extends component life compared to straight-cut spur gears.
| Module | 0.5M |
|---|---|
| Number of Teeth | 14T |
| Bore Diameter | 2.9mm (~0.114 in) |
| Gear Width | Typically 5–8mm (0.20–0.31 in) |
| Pitch Diameter | 7mm (0.5M × 14T) |
| Tooth Profile | Helical |
| Material | Carbon Steel |
| Finish | See variant options |
| Packing Quantity | 1pcs / 5pcs / 10pcs (see variant options) |
| Compatible Module | M0.5 gear systems |
| Pressure Angle | Contact us to confirm |
Module (M) is the standardized unit that defines gear tooth size. M0.5 means the pitch diameter divided by the number of teeth equals 0.5mm. For two gears to mesh correctly, they must share the same module. Check the module specification on your existing gear or motor pinion — if it reads M0.5 or 0.5M, this gear will mesh with it.
Helical gears have teeth cut at an angle to the gear axis, so multiple teeth engage simultaneously rather than one at a time. This distributes load more evenly, reduces impact noise, and produces smoother rotation — especially at higher speeds. If your application is noise-sensitive (e.g., a camera slider or indoor robot), helical gears are a meaningful upgrade over spur gears of the same module.
The bore is 2.9mm, which fits shafts with an outer diameter of approximately 2.9mm. Many small DC motors, micro gear motors, and stepper motor output shafts in the 3mm class may require light fitting or a set screw for secure attachment. Measure your shaft OD with calipers before ordering. If your shaft is slightly larger (e.g., 3.0mm), a light press fit or reaming may be needed.
Carbon steel offers good mechanical strength but has limited corrosion resistance compared to stainless steel. For outdoor or high-humidity applications, we recommend applying a light machine oil or grease to the gear teeth and bore after installation. For fully corrosion-resistant builds, consider stainless steel alternatives. For indoor robotics, automation, and RC applications, carbon steel performs reliably with minimal maintenance.
If you're building a single mechanism or replacing one worn gear, the 1-piece pack is sufficient. For projects with multiple gear stages or if you want spares on hand, the 5-piece pack offers better value per unit. The 10-piece pack is ideal for batch builds, classroom projects, or production prototypes where you need consistent parts across multiple assemblies.
Gear ratio is calculated as the number of teeth on the driven gear divided by the number of teeth on the driving pinion. With this 14-tooth pinion driving a 28-tooth gear, you get a 2:1 reduction (half the speed, double the torque). Pairing with a 42-tooth gear gives 3:1, and so on. All mating gears must be M0.5 module to mesh correctly.
Yes — M0.5 helical pinion gears are commonly used in compact extruder drive mechanisms and small CNC axis drives. Verify that your existing gear train uses M0.5 module components and that the 2.9mm bore matches your motor shaft. For high-cycle or high-torque CNC applications, ensure adequate lubrication to extend service life.
