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When a slipping or noisy gear derails your build, the root cause is almost always a mismatch between gear geometry and shaft fit. Machinists, robotics engineers, and DIY drive-train builders who need a compact 15-tooth helical pinion with a precise bore-and-keyway fit will find this 45# steel helical gear engineered to eliminate that frustration from the start.
Each gear is machined from 45# medium-carbon steel and finished with a blackening treatment for corrosion resistance and a clean, professional appearance. The module 2 (2 Mod) tooth profile delivers smooth, low-noise meshing. Bore diameters range from 12 mm (0.47 in) to 22 mm (0.87 in) with matching keyways from 4 mm to 6 mm, covering the most common shaft sizes used in light-to-medium power transmission applications.
Typical use cases include CNC router axis drives, robotic arm joint transmissions, conveyor reduction stages, and custom gearbox builds where a helical pinion gear with keyway bore is required for positive torque transfer without set-screw slip.
Machined from 45# steel for a balance of toughness, machinability, and wear resistance suited to moderate-load transmission applications.
Oxide blackening provides a uniform dark finish that resists surface rust and reduces light reflection in precision assemblies.
15-tooth, 2 Mod helical profile ensures smooth, quiet meshing and gradual load engagement compared to equivalent spur gears.
Nine bore-and-keyway combinations (Bore 12–22 mm / Keyway 4–6 mm) let you match the gear directly to your shaft without custom machining.
Available in Pack of 1 for single-axis builds or Pack of 2 for paired-drive or spare-on-hand configurations, priced accordingly.
Standard Mod 2 tooth form is interchangeable with other Mod 2 helical pinions, making this a reliable drop-in replacement for worn drive gears in existing assemblies.
| Module | 2 (Mod 2) |
|---|---|
| Number of Teeth | 15T |
| Material | 45# Medium-Carbon Steel |
| Surface Finish | Blackened (Oxide Treatment) |
| Bore Diameter | 12 / 14 / 15 / 16 / 17 / 18 / 19 / 20 / 22 mm — See variant options |
| Keyway Width | 4 mm (Bore 12 mm) / 5 mm (Bore 14–17 mm) / 6 mm (Bore 18–22 mm) — See variant options |
| Pitch Circle Diameter | 30 mm (0.47 in) — calculated: Module × Teeth |
| Gear Type | Helical Pinion |
| Pack Quantity | 1 or 2 — See variant options |
| Helix Angle | Contact us to confirm |
| Face Width | Contact us to confirm |
Measure your shaft diameter with a caliper. Select the bore option that matches your shaft exactly — for example, a 16 mm shaft requires the "Bore 16 Keyway 5mm" variant. The keyway must also align with the key stock on your shaft. If your shaft is between listed sizes, contact us to confirm the closest fit.
45# steel offers a tensile strength of approximately 600–800 MPa depending on heat treatment. For light-to-medium duty applications such as CNC axis drives, robotic joints, and small conveyor stages, this gear is well suited. For heavy industrial loads or continuous high-torque applications, please contact us to confirm suitability.
The blackened oxide finish provides basic surface corrosion resistance suitable for indoor and dry environments. For outdoor, wet, or chemically exposed applications, additional lubrication or a protective coating is recommended. The finish is not equivalent to stainless steel or hot-dip galvanizing.
This is a helical gear. It will mesh correctly with other Module 2 helical gears of the same helix angle and direction. Meshing a helical gear with a standard spur gear of the same module is generally not recommended for load-bearing applications as it produces axial thrust and uneven contact. Contact us to confirm compatibility with your specific mating gear.
Pack of 1 contains a single gear — ideal when you need one pinion for a single drive axis. Pack of 2 contains two identical gears at a reduced per-unit cost, useful for paired-drive configurations, dual-axis builds, or keeping a spare on hand for maintenance.
All variants include a machined keyway. While you can technically use the bore without a key (relying on friction or a set screw in the keyway slot), this is not recommended for torque-transmitting applications as it risks shaft damage and gear slip. For best results, use a matching key stock to fill the keyway.
The helix angle determines the direction and degree of tooth engagement. Please contact us with your mating gear specifications and we will confirm whether this pinion is compatible with your assembly before you order.
