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When your build demands a reliable right-angle drive — whether you're assembling a CNC axis, a conveyor corner, or a custom robotics joint — a loose-tolerance or undersized gear becomes the weakest link in the chain. These Module 1.5 bevel gears are engineered for makers, mechanical engineers, and workshop builders who need repeatable, low-backlash 90° power transfer without sourcing from industrial distributors.
Each gear is machined from C45 medium-carbon steel and finished with a hard black oxide coating for corrosion resistance and reduced surface friction. The module is 1.5 (metric), with a 1:2 gear ratio pairing (pinion to wheel). Tooth counts span 15, 18, 20, 30, 36, and 40 teeth. Bore sizes range from 6 mm (0.24 in) up to 20 mm (0.79 in), with keyway options (4 mm or 5 mm or 6 mm keyway) available on larger bores for positive shaft locking. Pitch diameter ranges from approximately 22.5 mm (0.89 in) for the 15T gear up to 60 mm (2.36 in) for the 40T gear.
Typical use cases include: right-angle gearbox assemblies for CNC router Z-axis drives, differential steering mechanisms in wheeled robots, and compact 90° torque redirection in automated conveyor systems — all applications where a module 1.5 bevel gear set with a fixed 1:2 ratio and hardened black finish delivers consistent mesh geometry and long service life.
Machined from C45 medium-carbon steel for a balance of machinability, toughness, and wear resistance — suited for moderate-to-high load mechanical drives.
The 90° hard black surface treatment reduces bare-metal corrosion and lowers sliding friction at the tooth contact zone, extending service intervals in workshop environments.
Bevel geometry is cut to a 90° shaft angle, enabling direct right-angle power transmission without additional brackets or universal joints.
The 1:2 ratio pairing (e.g., 15T pinion × 30T wheel, 20T × 40T) delivers a 2× speed reduction or 2× torque multiplication depending on which shaft is driven.
Larger bore variants include a precision-cut keyway (4 mm, 5 mm, or 6 mm) for positive shaft engagement — eliminating set-screw slip under reversing or shock loads.
Available in 1, 2, or 3-piece quantities per order — convenient for prototype builds, replacement sourcing, or stocking a matched gear pair in a single transaction.
| Module | 1.5 (metric) |
|---|---|
| Gear Ratio | 1:2 |
| Tooth Count Options | 15T, 18T, 20T, 30T, 36T, 40T |
| Shaft Angle | 90° |
| Material | C45 Medium-Carbon Steel |
| Surface Finish | Hard Black Oxide |
| Bore Diameter Options | 6 mm, 8 mm, 10 mm, 12 mm, 14 mm, 15 mm, 16 mm, 18 mm, 20 mm |
| Keyway Options | 4 mm (12 mm bore), 5 mm (14–16 mm bore), 6 mm (18–20 mm bore) |
| Pitch Diameter Range | Approx. 22.5 mm – 60 mm (0.89 in – 2.36 in) |
| Pressure Angle | See variant options |
| Face Width | See variant options |
| Hub Diameter | See variant options |
| Weight (per piece) | See variant options |
| Available Quantities | 1 pcs, 2 pcs, 3 pcs |
The 1:2 ratio is fixed, so you select a matched pair: 15T pinion with 30T wheel, 18T with 36T, or 20T with 40T. Choose the tooth count based on the pitch diameter that fits your housing envelope. Larger tooth counts give a larger pitch diameter and generally handle higher torque loads.
Measure your shaft diameter precisely with a caliper. Select the bore that matches your shaft — for example, an 8 mm bore for an 8 mm shaft. For shafts 12 mm and above, consider a keyway bore variant for positive locking under reversing or shock loads. Confirm the keyway width matches your shaft key.
Plain bores (6–12 mm) are suitable for light-to-moderate unidirectional loads where a set screw provides adequate retention. Keyway bores are recommended for applications with reversing loads, high torque, or vibration — the key prevents rotational slip that set screws alone cannot reliably resist over time.
Black oxide provides mild corrosion resistance suitable for indoor workshop and light industrial environments. It is not equivalent to zinc plating or stainless steel for outdoor or high-humidity exposure. For demanding environments, apply a light machine oil or grease to the gear teeth and bore after installation.
C45 steel bevel gears at Module 1.5 are designed for moderate mechanical drives — typical applications include robotics joints, small conveyor corners, and CNC axis drives. Exact torque ratings depend on operating speed, lubrication, and mounting rigidity. Contact us to confirm suitability for high-cycle or heavy-load industrial applications.
Module 1.5 is a standardized metric gear module, so these gears will mesh with any correctly manufactured Module 1.5 bevel gear of the same pressure angle and shaft angle (90°). Verify the pressure angle (typically 20°) with your existing gear before mixing suppliers, as minor manufacturing tolerances can affect backlash.
Each variant listing is for a single gear (pinion or wheel) at the specified tooth count. To build a complete 1:2 ratio drive, you need to order both the pinion (e.g., 15T or 20T) and the corresponding wheel (30T or 40T) separately. The quantity option (1, 2, or 3 pcs) refers to the number of identical gears per order.
