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When your build demands a reliable right-angle drive that won't slip under load, a mismatched or keyway-free bevel gear becomes the weakest link in the entire drivetrain. Engineers, robotics builders, and machine designers who need a repeatable 1:1.5 speed ratio at a true 90° mesh angle will find these bevel gears a direct solution — available in both 2 modulus and 2.5 modulus, with 20-tooth or 30-tooth configurations to suit a wide range of torque and speed requirements.
Each gear is machined from 45# carbon steel, offering a balance of toughness and machinability suited to mechanical power transmission. The bore diameter ranges from 12 mm (0.47 in) to 30 mm (1.18 in) depending on the variant selected, and each gear ships with a precision-cut keyway — sized 4×2 mm, 5×2.5 mm, 6×3 mm, or 8×3.5 mm — to lock the gear firmly onto the shaft and eliminate rotational slip. Gears are sold individually (1 pc per order).
Typical use cases include DIY CNC router axis drives requiring a compact right-angle gearbox, small electric motor output stages in conveyor or automation rigs, and robotics joint assemblies where a fixed 1:1.5 reduction ratio is needed between perpendicular shafts. Long-tail applications such as "90 degree bevel gear set with keyway" and "metric modulus bevel gear motor coupling" are well served by this range.
Engineered for perpendicular shaft arrangements, delivering clean right-angle power transfer without axial thrust imbalance common in mismatched bevel pairs.
The 20-tooth / 30-tooth pairing produces a consistent 1:1.5 reduction ratio, useful for motor output stages where moderate speed reduction is needed without a full gearbox.
Each gear includes a machined keyway (4×2 mm up to 8×3.5 mm depending on bore size), ensuring positive shaft engagement and eliminating rotational play under reversing loads.
Choose between 2 modulus and 2.5 modulus to match your existing gear train. Larger modulus gears carry higher torque loads; smaller modulus suits compact, higher-speed applications.
Bore diameters span 12 mm to 30 mm (0.47–1.18 in), covering common motor shaft sizes from small stepper motors up to mid-frame servo and induction motors.
Machined from 45# carbon steel for reliable strength and wear resistance in continuous-duty mechanical drives, without the brittleness of cast alternatives.
| Modulus | 2 / 2.5 (see variant options) |
|---|---|
| Tooth Count | 20T (pinion) / 30T (gear) — 1:1.5 ratio pair |
| Mesh Angle | 90° |
| Speed Ratio | 1:1.5 |
| Bore Diameter | 12–30 mm (see variant options) |
| Keyway Size | 4×2 mm / 5×2.5 mm / 6×3 mm / 8×3.5 mm (see variant options) |
| Material | 45# Carbon Steel |
| Finish | See variant options |
| Quantity per Order | 1 pc |
| Pressure Angle | Contact us to confirm |
| Face Width | See variant options |
Yes. Each listing is for one individual gear (1 pc). To form a working 90° bevel gear pair, you need to purchase both the 20-tooth pinion and the 30-tooth gear in the same modulus. Make sure both gears share the same modulus — mixing moduli will result in incorrect mesh and premature wear.
Modulus determines tooth size and load capacity. A 2.5 modulus gear has larger, stronger teeth and handles higher torque, making it better for heavier-duty drives. A 2 modulus gear is more compact and suits higher-speed, lower-torque applications such as small CNC axes or lightweight robotics joints. Match the modulus to your existing gear train or calculate based on your torque requirements.
Measure your shaft diameter precisely with a caliper. Select the bore that matches your shaft — a bore that is too large will cause runout even with a key fitted. The keyway size is automatically paired with the bore in the variant options. If your shaft has a pre-cut keyway, confirm the key dimensions match before ordering.
These gears are machined from 45# carbon steel, which provides solid tensile strength and wear resistance for continuous-duty mechanical drives at moderate speeds and loads. They are suitable for small-to-mid-frame motor output stages, conveyor drives, and robotics joints. For very high-speed or shock-load applications, consider whether heat treatment or a higher-alloy steel would be more appropriate for your specific duty cycle.
The standard pressure angle for this type of metric bevel gear is typically 20°, which is the most common for industrial and DIY mechanical drives. If your application requires specific pressure angle confirmation, please contact us before ordering to verify compatibility with your existing gear set.
45# carbon steel is not inherently corrosion-resistant. For outdoor, humid, or washdown environments, apply a suitable gear lubricant or grease and consider a protective coating. Contact us if corrosion resistance is a primary requirement to confirm whether alternative options are available.
The 1:1.5 ratio is fixed by the 20-tooth / 30-tooth pairing. To achieve a different ratio, you would need a different tooth count combination. Browse our other bevel gear listings or contact us for assistance selecting the right gear pair.
