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When your drive system needs to change direction without losing torque, a mismatched or worn bevel gear becomes the weakest link in the chain. Engineers, robotics builders, CNC hobbyists, and mechanical DIYers rely on accurately cut bevel gears to keep their 90° transmission stages running smoothly and quietly under load.
These bevel gears are machined from 45# medium-carbon steel, offering a reliable balance of hardness and toughness for demanding drive applications. The range covers Module 0.5 through Module 6 and tooth counts from 15T to 40T (select variants extend to 30T or 40T depending on module), with outer diameters spanning approximately 7.5 mm (0.30 in) for the smallest 0.5 Mod 30T up to 240 mm (9.45 in) for the largest 6 Mod options. Bore sizes vary by variant — see variant options for exact bore dimensions.
Typical use cases include 90° gearbox assemblies in desktop CNC routers, differential drive stages in wheeled robots, right-angle power take-off units in custom automation rigs, and bevel gear pairs for DIY lathe or milling attachments where a compact direction change is needed.
| Material | 45# Medium-Carbon Steel |
|---|---|
| Module Range | 0.5 / 1 / 1.5 / 2 / 2.5 / 3 / 4 / 5 / 6 |
| Tooth Count Range | 15T – 40T (varies by module) |
| Transmission Angle | 90° |
| Outer Diameter | See variant options |
| Bore Diameter | See variant options |
| Face Width | See variant options |
| Surface Finish | Machined (natural steel) |
| Tooth Profile | Standard straight bevel |
| Quantity per Order | 1 piece |
Module (Mod) defines the tooth size — a higher module means larger, stronger teeth suited for higher torque. Tooth count (T) determines the gear ratio when paired with a driven gear. For a 1:1 ratio, select the same tooth count on both driver and driven gears. For a speed reduction, choose a smaller tooth count on the driver and a larger count on the driven gear. Always match modules between meshing gears.
No. Bevel gears must be the same module to mesh correctly. Mixing modules results in incorrect tooth engagement, accelerated wear, and potential gear failure. Always select the same module for both the driver and driven gear in your 90° transmission pair.
These gears are machined from 45# medium-carbon steel, which provides a tensile strength typically in the range of 600–800 MPa depending on heat treatment. They are suitable for moderate-to-high torque applications in robotics, CNC, and automation. For very high shock loads or continuous heavy-duty industrial use, consider whether additional surface hardening is required for your specific application.
45# steel has moderate corrosion resistance. For environments with moisture, chemicals, or outdoor exposure, we recommend applying a light machine oil or grease coating during installation and periodically during service. For highly corrosive environments, consider stainless steel alternatives.
Bore diameter varies by module and tooth count. Some variants (e.g., 1 Mod 20T) are available with 6 mm or 8 mm bore options as indicated in the size selector. For other variants, please refer to the variant name or contact us to confirm the bore size before ordering to ensure compatibility with your shaft.
Each order is for one individual bevel gear. To complete a 90° transmission stage, you need two gears of the same module. Add two items to your cart — one for the driver shaft and one for the driven shaft — selecting the appropriate tooth counts for your desired gear ratio.
These gears are well suited for desktop CNC router axis drives, wheeled robot differential assemblies, right-angle power take-off stages in custom automation equipment, DIY lathe and milling attachments, educational mechanical engineering projects, and general-purpose 90° gearbox builds where a compact direction change is required.
