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When your project demands a reliable 90-degree power transfer — whether you're building a CNC axis, a robotic arm joint, or a custom motor gearbox — a poorly matched bevel gear can introduce backlash, noise, and premature wear. These 4M and 5M module bevel gears are engineered for makers, engineers, and hobbyists who need accurate, repeatable torque transmission at right angles without compromise.
Each bevel gear is machined from carbon steel and features a 90° mating angle with a 1:1 ratio, meaning both the drive and driven gears share the same tooth count and module. Available in 4M (4mm module) and 5M (5mm module) configurations, with tooth counts ranging from 15T to 35T (approximately 60mm–175mm pitch diameter depending on module and tooth count). The bore and keyway dimensions vary by variant — see variant options for exact bore sizing.
Typical use cases include DIY CNC router Z-axis drives, small-scale conveyor corner drives, robotics joint assemblies requiring 90° redirection, and custom motor transmission builds where a compact right-angle gear pair is needed. Long-tail search terms like "4 mod bevel gear pair", "5M 90 degree steel gear", and "right angle bevel gear for motor" describe exactly what this product delivers.
Machined from carbon steel for solid load-bearing capacity, wear resistance, and dimensional stability under continuous rotational stress.
Engineered to a precise 90-degree shaft angle, enabling clean right-angle power transfer with minimal vibration and backlash in matched pairs.
Drive and driven gears share identical tooth counts and module, delivering a direct 1:1 speed and torque ratio — ideal for direction-change applications without speed reduction.
Available in 15T through 35T configurations across both 4M and 5M modules, giving you flexibility to match pitch diameter and torque capacity to your specific drivetrain geometry.
Choose 4M for compact, lighter-duty builds or 5M for heavier torque loads. Both modules follow standard metric gear geometry for straightforward integration with off-the-shelf shafts and housings.
Bore and keyway dimensions are sized for common motor shaft diameters. Suitable for direct coupling to DC motors, stepper motors, and servo outputs in custom transmission assemblies.
| Module | 4M / 5M (see variant options) |
|---|---|
| Tooth Count | 15T – 35T (see variant options) |
| Shaft Angle | 90° |
| Transmission Ratio | 1:1 |
| Material | Carbon Steel |
| Pitch Diameter | See variant options |
| Bore Diameter | See variant options |
| Keyway | See variant options |
| Surface Finish | Natural / Uncoated |
| Pressure Angle | 20° (standard metric) |
| Application | Motor transmission, robotics, CNC, DIY drivetrain |
| Sold As | Single gear (one piece per order) |
Module size determines the tooth size and load capacity. 4M gears have smaller teeth and suit lighter-duty or more compact builds, while 5M gears have larger teeth and handle higher torque loads. Match the module to your existing gear system — mixing modules will result in incompatible meshing.
Yes. Each listing sells a single bevel gear. For a 1:1 right-angle drive, you need two identical gears (same module and same tooth count) — one for the drive shaft and one for the driven shaft. Add two units to your cart to complete the pair.
Since the ratio is always 1:1, tooth count primarily affects pitch diameter and the physical size of the gear. Higher tooth counts (e.g., 25T–35T) produce larger pitch diameters and can transmit more torque at lower surface stress. Lower tooth counts (15T–20T) keep the assembly compact. Select based on your available space and shaft center distance.
These gears are machined from carbon steel with a natural uncoated finish, which provides good mechanical strength but limited corrosion resistance in wet or high-humidity environments. For outdoor or washdown applications, consider applying a light machine oil or grease coating, or contact us to confirm suitability for your environment.
Bore diameter and keyway dimensions vary by variant. Please check the specific bore size listed for your chosen module and tooth count against your motor shaft diameter before ordering. If your shaft requires a custom bore, the gear can typically be re-bored by a local machine shop.
Yes. These bevel gears are well-suited for CNC router axis drives, 3D printer extruder gearboxes, and similar precision motion applications where a 90° direction change is needed. Ensure your frame and bearing supports are aligned to the 90° shaft angle for smooth, low-backlash operation.
These gears follow standard metric gear geometry with a 20° pressure angle, which is the most common standard for industrial and hobbyist metric gears. This ensures compatibility with other standard 20° metric bevel gear counterparts of the same module.
