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When a standard straight-cut bevel gear introduces too much noise, vibration, or shock load into your drive system, it is time to step up to a spiral bevel gear. Engineers designing precision CNC axes, robotics integrators building articulated joints, and industrial automation specialists assembling right-angle gearboxes all rely on spiral bevel gears to deliver smoother, quieter, and stronger torque transfer than their straight-tooth counterparts.
Each spiral bevel gear in this range is machined from 45# medium-carbon steel — a material known for its balanced combination of tensile strength, machinability, and wear resistance. Available in eight module sizes from 1 Mod through 6 Mod, with tooth counts from 15 to 30 teeth (single gears) or matched reduction pairs (e.g. 15T+30T, 20T+40T), and bore diameters from 6 mm (0.24 in) up to 25 mm (0.98 in). The helical tooth geometry engages at a 90-degree shaft angle, distributing load across multiple teeth simultaneously for reduced contact stress and extended service life.
Typical applications include right-angle gearbox assemblies in desktop CNC routers and milling machines, spiral bevel gear pairs for robotic wrist and elbow joints requiring low-noise articulation, and custom reduction drives in conveyor systems, packaging machinery, and automation rigs where a specific gear ratio and compact 90-degree layout are essential.
Machined from 45# steel for a strong balance of hardness, tensile strength, and machinability — suitable for continuous-duty drives in CNC, robotics, and light industrial equipment.
The curved tooth geometry ensures gradual, multi-tooth engagement at 90°, dramatically reducing impact noise and vibration compared to straight-cut bevel gears under the same load.
Choose from 1, 1.5, 2, 2.5, 3, 4, 5, or 6 module to match your pitch diameter requirements, torque capacity, and housing geometry across a wide range of drive applications.
Available as individual gears (same-tooth-count 1:1 pairs) or as pre-matched reduction sets (e.g. 15T+30T for 1:2, 20T+40T for 1:2, 20T+60T for 1:3) — saving you the effort of sourcing and matching separately.
Bore options from 6 mm to 25 mm accommodate a broad range of shaft diameters, from small servo shafts in robotics to larger drive shafts in industrial gearboxes.
Metric module dimensions ensure compatibility with standard gear design calculations and interchangeability with other metric-module spiral bevel gears of the same module and tooth count.
| Gear Type | Spiral (Helical) Bevel Gear |
|---|---|
| Module Range | 1 / 1.5 / 2 / 2.5 / 3 / 4 / 5 / 6 |
| Number of Teeth | 15 – 30 (single); matched pairs available (e.g. 15T+30T, 20T+40T) |
| Shaft Angle | 90° |
| Material | 45# medium-carbon steel |
| Bore Diameter | 6 / 8 / 10 / 12 / 15 / 18 / 25 mm (see variant options) |
| Pitch Diameter (1 Mod, 20T) | 20 mm (0.79 in) |
| Pitch Diameter (3 Mod, 20T) | 60 mm (2.36 in) |
| Pitch Diameter (6 Mod, 20T) | 120 mm (4.72 in) |
| Pressure Angle | 20° (standard metric) |
| Tooth Profile | Spiral / helical |
| Surface Finish | See variant options |
| Quantity per Order | 1 Set (single gear or matched pair — see variant options) |
A spiral bevel gear has curved, helical teeth that engage gradually across multiple tooth faces simultaneously. This produces smoother, quieter operation and distributes load more evenly compared to straight bevel gears, which engage abruptly along the full tooth width. Spiral bevel gears are preferred for higher-speed, lower-noise, and higher-torque applications.
The module determines tooth size and pitch diameter (PD = Module × Teeth). Larger modules produce larger, stronger teeth capable of handling higher torque. For light-duty robotics or small mechanisms, 1–2 Mod is typically sufficient. For moderate industrial drives, 2.5–4 Mod is common. For heavy-duty gearboxes, 5–6 Mod provides the tooth strength needed. Always match the module between the two mating gears.
Yes. Variants listed as "X Teeth + Y Teeth" include both gears as a matched set (1 Set). The smaller gear is the pinion and the larger is the wheel. The gear ratio equals the larger tooth count divided by the smaller (e.g. 20T + 40T = 1:2 ratio). Single-tooth-count variants (e.g. "20 Teeth") are individual gears for 1:1 pairing.
Select the bore diameter that matches your shaft diameter. Available bores range from 6 mm to 25 mm depending on the module and tooth count. If your shaft is slightly smaller than the bore, a keyway and set screw or a shaft collar can be used to secure the gear. If your shaft is larger than the available bore, contact us to confirm options before ordering.
These 45# steel spiral bevel gears are designed for light to moderate continuous-duty applications including CNC machine axes, robotic joints, and automation drives. For heavy industrial gearboxes operating at sustained high torque and speed, please contact us to confirm suitability for your specific load and duty cycle requirements.
45# carbon steel has moderate corrosion resistance. For environments with moisture, humidity, or mild chemical exposure, we recommend applying a gear lubricant or grease to the tooth surfaces and bore. For highly corrosive environments, consider a protective coating after installation.
No. Bevel gears must be matched by module. A 2 Mod gear will only mesh correctly with another 2 Mod gear. Mixing modules results in incorrect tooth engagement geometry, accelerated wear, excessive noise, and potential gear failure. Always select the same module for both the pinion and the wheel in a mating pair.
