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When a right-angle drive fails mid-project — whether in a DIY gearbox, a CNC axis, or a custom automation rig — the culprit is almost always an undersized or poorly finished gear. This Mod 1.5 bevel gear is engineered for makers, machinists, and engineers who need a dependable 1:1.25 ratio right-angle transmission component without sourcing from industrial distributors.
Each gear is machined from C45 medium-carbon steel and treated with a hardened black oxide finish for improved surface hardness and corrosion resistance. The module is 1.5, with tooth counts of 20 (driver) or 25 (driven) to achieve the 1:1.25 speed reduction ratio. Bore sizes range from 8mm to 16mm (approximately 0.31" to 0.63"), accommodating a wide range of shaft diameters. Tooth face width is typically 12–18mm depending on the tooth count variant.
Typical use cases include DIY differential drives and steering mechanisms, small-scale CNC machine axis conversions requiring a 90° power turn, and custom robotics or automation builds where a compact bevel gear pair replaces a worm drive for higher efficiency.
| Module | 1.5 |
|---|---|
| Tooth Count (Driver) | 20 Tooth |
| Tooth Count (Driven) | 25 Tooth |
| Ratio | 1:1.25 |
| Material | C45 Medium-Carbon Steel |
| Surface Treatment | Hardened Black Oxide |
| Bore Size | 8 / 10 / 12 / 14 / 15 / 16mm (See variant options) |
| Bore Type | Plain round (no keyway) |
| Pressure Angle | 20° |
| Shaft Angle | 90° |
| Tooth Face Width | Typically 12–18mm (varies by tooth count) |
| Pack Quantity | See variant options (1 / 2 / 3 / 4 / 5 / 10 pcs) |
| Weight (per piece) | See variant options |
Yes — for a functional 1:1.25 bevel gear pair, you need one 20-tooth (driver) and one 25-tooth (driven) gear. They share the same Module 1.5 tooth geometry and mesh at a 90° shaft angle. If you only need a replacement for one side, you can order a single piece of the required tooth count.
Measure your shaft diameter with a caliper. The bore must match your shaft exactly — a loose bore will cause slippage under load. Available sizes are 8, 10, 12, 14, 15, and 16mm. If your shaft is imperial (e.g., 3/8" = 9.5mm), choose the nearest metric bore and use a sleeve bushing or have the bore lightly reamed to fit.
The bore is supplied as a plain round hole with no keyway. If your application requires a keyed connection, a local machine shop can broach or mill a keyway into the bore after purchase. The C45 steel is machinable with standard tooling.
The hardened black oxide finish improves surface hardness and provides mild corrosion resistance suitable for dry indoor environments and light workshop conditions. It is not recommended for continuous outdoor exposure, high-humidity environments, or direct contact with water without additional lubrication or sealing. For outdoor applications, apply a light coat of grease or anti-rust oil to the gear teeth and bore.
Exact torque and RPM ratings depend on the specific bore size, shaft fit, lubrication, and operating conditions. As a conservative guideline for Mod 1.5 C45 steel bevel gears, continuous torque capacity is typically in the range of 5–15 N·m per gear depending on tooth count and load distribution. For high-speed or high-torque applications, contact us to confirm suitability before ordering.
Each listing variant represents a single gear type (either 20-tooth or 25-tooth) in your chosen bore size and quantity. To build a complete bevel gear pair, add one 20-tooth variant and one 25-tooth variant to your cart, both with matching bore sizes. Multi-piece quantities (2, 3, 4, 5, 10 pcs) refer to multiples of the same gear, not pairs.
In principle, yes — Module 1.5 is a standardized metric tooth profile, so gears from different manufacturers with the same module and pressure angle (20°) should mesh correctly. However, minor manufacturing tolerances can affect backlash and noise. For critical applications, we recommend using matched pairs from the same production batch for optimal meshing performance.
