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When a motion system demands a precise 90° direction change without slipping or backlash creep, the wrong gear ruins the whole build. Hobbyists assembling CNC routers, engineers prototyping robotic joints, and makers building custom drive trains all need a bevel gear they can trust to mesh cleanly and hold up under repeated load cycles.
These bevel gears are machined from C45 medium-carbon steel and surface-hardened with a black oxide finish for corrosion resistance and reduced light reflection. Available in three modules (Mod 1, Mod 1.5, Mod 2) and two tooth counts (20T and 25T), with bore sizes ranging from 6 mm (0.24 in) to 20 mm (0.79 in). Keyway options (4 mm or 5 mm or 6 mm depending on bore) are available on Mod 2 variants for positive shaft locking.
Typical use cases include right-angle gearbox assemblies in CNC router Z-axis drives, bevel gear pairs for robotic arm wrist joints, and custom differential gear sets in RC vehicle and automation projects requiring compact 1:1.25 ratio power transfer.
Machined from C45 steel for a balance of machinability and tensile strength, suitable for moderate-to-high torque right-angle drives.
The hardened black finish reduces surface friction, provides mild corrosion resistance, and minimises glare in exposed drive assemblies.
Select the module that matches your existing gear train. Larger modules carry higher loads; smaller modules suit compact, low-torque mechanisms.
Mod 2 variants offer keyway bores (4 mm, 5 mm, or 6 mm keyway) to prevent rotational slip under shock loads — critical for servo and motor shafts.
Bore sizes from 6 mm (0.24 in) to 20 mm (0.79 in) cover the most common motor and shaft diameters used in DIY robotics and CNC builds.
The 20-tooth and 25-tooth pairing delivers a 1:1.25 speed reduction ratio, useful for modest torque multiplication in compact right-angle drives.
| Material | C45 Medium-Carbon Steel |
|---|---|
| Surface Treatment | Black Oxide (Hardened) |
| Available Modules | Mod 1 / Mod 1.5 / Mod 2 |
| Tooth Count Options | 20 Tooth / 25 Tooth |
| Gear Ratio | 1 : 1.25 (20T : 25T pair) |
| Bore Diameter Range | 6 mm – 20 mm (0.24 in – 0.79 in) |
| Keyway Options | 4 mm / 5 mm / 6 mm (Mod 2 variants only) |
| Pressure Angle | See variant options |
| Pitch Cone Angle | See variant options |
| Face Width | See variant options |
| Weight | See variant options |
| Quantity per Order | 1 pc |
The module must match between meshing gears. Mod 1 suits light-load, compact mechanisms (e.g., small robotics). Mod 1.5 is a mid-range choice for moderate torque. Mod 2 handles higher loads and is common in CNC and industrial-style DIY builds. Check your existing gear train or motor pinion module before selecting.
Yes — two gears of the same module and tooth count will mesh at a 1:1 ratio. However, this product is designed and sold as a 1:1.25 ratio pair (20T driving 25T or vice versa). If you need a 1:1 ratio, order two 20-tooth gears of the same module.
Keyway bores are only available on Mod 2 variants. A keyway is recommended when the shaft transmits shock loads or reversing torque, as it prevents the gear from spinning on the shaft. Match the keyway width to your shaft's existing keyway slot: 4 mm keyway for 12 mm bore, 5 mm keyway for 14–16 mm bore, and 6 mm keyway for 18–20 mm bore.
C45 steel has a tensile strength of approximately 600–800 MPa in its normalised state, rising after surface hardening. It is well-suited for moderate-torque right-angle drives in robotics, CNC, and automation. For very high-torque or continuous industrial duty, consider alloy steel gears (e.g., 40Cr). Contact us if you need load calculations for your specific application.
Black oxide provides mild corrosion resistance suitable for indoor, dry environments. It is not a substitute for stainless steel or zinc plating in humid or outdoor conditions. For added protection, apply a light machine oil or grease to the gear surface after installation.
Measure your motor or drive shaft diameter precisely with a calliper. Select the bore size that matches — a bore that is too large will cause runout and vibration. If your shaft has a keyway, choose the corresponding keyway bore variant (Mod 2 only). For plain shafts, a standard bore with a set-screw or locking collar is typical.
These gears can operate with light grease or oil lubrication, which is recommended for extended service life. Avoid submerging in water or exposing to corrosive fluids, as the black oxide finish offers only mild protection. For wet environments, consider stainless steel alternatives.
