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When your motion-control build demands a reliable 90° power turn without backlash-prone spur gears, finding a spiral bevel gear that fits your shaft, matches your module, and ships ready to install is a real challenge. Makers, automation engineers, and machine builders who work with compact gearboxes, CNC axes, or custom drive trains need a helical bevel gear that delivers smooth, low-noise engagement from the first revolution.
These helical spiral bevel gears are machined from 45# medium-carbon steel and are available in three module sizes — 1M, 1.5M, and 2M — with tooth counts ranging from 13 to 30T. Bore options span 6 mm (0.24 in) up to 25 mm (0.98 in), with keyway variants available from 10 mm bore and up, covering the most common shaft standards. All gears are cut in the left-hand (45°) spiral direction.
Typical use cases include right-angle gearbox assemblies for CNC router Z-axes, DIY lathe cross-slide drives, robotic joint actuators requiring helical bevel gear sets, and industrial conveyor corner drives where a spiral bevel gear pair reduces vibration and noise compared to straight-cut alternatives.
Machined from 45# carbon steel for a balance of machinability, toughness, and wear resistance suited to moderate-to-heavy drive loads.
Helical tooth geometry reduces impact noise and distributes load across multiple teeth simultaneously, enabling smoother torque transfer than straight bevel gears.
Select the module that matches your mating gear. Larger modules handle higher torque; smaller modules suit compact, high-speed applications.
Plain bores from 6–16 mm and keyed bores from 10–25 mm (with standard DIN keyways) cover the most common metric shaft sizes used in DIY and light-industrial builds.
Order a single gear for prototyping, a pair for a complete bevel set, or a pack of five for production runs or spares inventory — all at tiered pricing.
Combine different tooth counts to achieve your target gear ratio in a right-angle drive without adding a separate reduction stage.
| Material | 45# Medium-Carbon Steel |
|---|---|
| Gear Type | Helical Spiral Bevel Gear |
| Spiral Direction | Left-Hand (45°) |
| Module | 1M / 1.5M / 2M (see variant options) |
| Tooth Count | 13T / 15T / 20T / 26T / 30T (see variant options) |
| Bore Diameter | 6 mm – 25 mm (see variant options) |
| Keyway | Available on bores ≥10 mm; DIN standard keyway dimensions (see variant options) |
| Pressure Angle | See variant options |
| Surface Finish | See variant options |
| Pitch Cone Angle | See variant options |
| Pack Quantity | 1 pc / 2 pcs / 5 pcs (see variant options) |
| Application | Right-angle power transmission, CNC drives, gearboxes, robotics |
The module must match your mating bevel gear exactly. Module 1M suits compact, lighter-load applications; 1.5M is a versatile mid-range choice; 2M handles higher torque and larger shaft diameters. If you are replacing an existing gear, measure the tooth pitch or check the original gear's markings to confirm the module before ordering.
The gear ratio of a bevel pair equals the tooth count of the driven gear divided by the tooth count of the driving gear. For example, pairing a 13T pinion with a 26T gear gives a 2:1 reduction. Choose tooth counts from the available range (13T, 15T, 20T, 26T, 30T) to build your desired ratio. Both gears in the pair must share the same module.
Plain bore variants (6–16 mm) rely on a set screw or interference fit to secure the gear to the shaft. Keyway bore variants (10–25 mm) include a machined keyway slot that accepts a standard DIN key, providing a positive mechanical lock for higher torque transmission and preventing rotational slip under load. For driven applications with significant torque, keyway bores are recommended.
No. Helical spiral bevel gears must be paired with a matching helical bevel gear of the same module, same spiral angle, and opposite hand (left-hand pairs with right-hand). They are not interchangeable with straight-cut bevel gears even if the module and tooth count match, because the tooth geometry and contact pattern differ.
These gears are machined from 45# carbon steel, which has a tensile strength of approximately 600–800 MPa in the normalized condition. Actual load capacity depends on module size, tooth count, operating speed, lubrication, and mounting accuracy. For precise load ratings, contact us with your application details (RPM, torque, duty cycle) and we can advise on suitability.
Yes, lubrication is recommended for continuous-duty applications — a gear oil or grease rated for bevel gears will extend service life significantly. The base material is 45# carbon steel without a corrosion-resistant coating, so these gears are best suited for enclosed, lubricated gearboxes or indoor environments. For outdoor or high-humidity use, consider applying a protective grease or housing the gear set in a sealed enclosure.
This listing covers the left-hand helical bevel gear. To complete a bevel pair, you will also need the matching right-hand gear of the same module and tooth count. Search our store for the corresponding right-hand spiral bevel gear, or contact us and we can confirm the correct pairing for your build.
