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When a standard spur gear introduces too much noise or vibration into your drive train, engineers and makers reach for helical gears. This 1 Module Helical Gear with 45° spiral angle delivers smoother tooth engagement and quieter operation, making it the go-to choice for hobbyists, robotics builders, and small-machine designers who need dependable rotational power transfer without the clatter of straight-cut gears.
Each gear is machined from engineering-grade steel and features a 45° helix angle available in both left-hand (Left Spiral) and right-hand (Right Spiral) configurations. The tooth count spans from 26 to 80 teeth, with bore diameters ranging from 8 mm (0.31 in) to 25 mm (0.98 in). Keyway variants are available with standard DIN keyway dimensions — 3×1.4 mm, 4×1.8 mm, 5×2.3 mm, and 6×2.8 mm — to suit a wide range of shaft sizes. The stepped hub design provides axial location and simplifies assembly onto motor shafts.
Typical use cases include DC motor output stages in CNC router Z-axis drives, servo-driven conveyor reduction stages, and compact gearbox assemblies in 3D printer extruder mechanisms. The 1-module pitch makes these gears directly interchangeable with other Module 1 components, enabling straightforward gear-ratio selection for custom motor transmission gear projects.
The 45° spiral angle maximises tooth overlap ratio, distributing load across multiple teeth simultaneously for smoother, quieter operation compared to straight-cut spur gears.
Available in both left-hand and right-hand spiral configurations. Helical gears of opposite hand mesh together on parallel shafts, giving you full flexibility in drive layout design.
26 to 80 teeth and bore diameters from 8 mm to 25 mm (0.31–0.98 in) cover a broad range of gear ratios and shaft sizes in a single product family.
Select from plain bore or keyway-bored versions (3×1.4 mm, 4×1.8 mm, 5×2.3 mm, 6×2.8 mm) to match standard DIN shaft keyways and eliminate rotational slip under load.
The integrated step on the hub provides a positive axial shoulder for easy shaft positioning and reduces the need for additional spacers during assembly.
Conforms to the Module 1 pitch standard, allowing direct substitution or pairing with other Mod 1 gears, racks, and pinions for scalable motor transmission gear systems.
| Module | 1 |
|---|---|
| Helix Angle | 45° |
| Spiral Direction | Left Spiral / Right Spiral (see variant options) |
| Tooth Count | 26 / 28 / 30 / 36 / 40 / 45 / 50 / 60 / 72 / 80 teeth |
| Bore Diameter | 8 – 25 mm (0.31 – 0.98 in) — see variant options |
| Keyway | Plain bore or keyway (3×1.4 / 4×1.8 / 5×2.3 / 6×2.8 mm) — see variant options |
| Hub Style | Stepped hub |
| Material | Engineering-grade steel |
| Pitch Standard | Module 1 (metric) |
| Pressure Angle | See variant options |
| Surface Finish | See variant options |
| Weight | See variant options |
First determine your required gear ratio: divide the driven gear tooth count by the driving gear tooth count. Then match the bore diameter to your motor or shaft diameter. If your shaft has a keyway, select the corresponding keyway variant (e.g., 5×2.3 mm for a 14–17 mm shaft). Use the variant selector above to filter by Teeth & Bore.
Yes. On parallel shafts, a left-hand helical gear meshes with a right-hand helical gear of the same module and helix angle. If you need two gears on the same shaft driving a single output, both driving gears must be the same hand. Confirm your drive layout before ordering both spiral directions.
The helix angle is the angle between the tooth trace and the gear axis — 45° in this case. A higher helix angle increases the tooth overlap ratio, meaning more teeth share the load at any instant. This results in smoother, quieter operation and higher load capacity per tooth compared to spur gears, at the cost of introducing an axial thrust force that must be managed by thrust bearings.
These gears share the Module 1 pitch but have a 45° helix angle. They will not mesh correctly with straight-cut (0° helix) Module 1 spur gears or standard Module 1 racks. They must be paired with other Module 1 helical gears of the same helix angle and opposite hand for parallel-shaft applications.
The gears are machined from engineering-grade steel. Steel helical gears offer good strength and wear resistance for dry or lightly lubricated environments. For applications exposed to moisture or corrosive media, consider applying a light machine oil or grease coating, or contact us to confirm material options for your specific environment.
Yes, helical gears are well-suited to higher-speed applications due to their gradual tooth engagement. Ensure the bore fits your shaft with an appropriate tolerance (typically H7/h6 for a sliding fit), use a keyway variant if torque is high, and apply adequate lubrication. For very high-speed or high-load applications, consult a mechanical engineer to verify dynamic load ratings.
Plain bore variants have a smooth cylindrical bore and rely on a set screw or interference fit to transmit torque. Keyway bore variants include a machined slot that accepts a standard key, providing a positive mechanical connection between the gear and shaft. Keyway variants are recommended for applications with reversing loads or where precise angular positioning is required.
