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When your project demands a reliable 90-degree power transfer without slop or chatter, finding a bevel gear that fits your shaft and holds up under load is the real challenge. These C45 steel bevel gears are engineered for makers, robotics builders, CNC hobbyists, and mechanical engineers who need a drop-in drivetrain component that performs consistently across repeated cycles.
Each gear is machined from C45 medium-carbon steel and finished with a hardened black surface treatment for wear resistance. Available in three module sizes — Module 1, Module 1.5, and Module 2 — with either 15-tooth (pinion) or 45-tooth (wheel) configurations, forming a fixed 1:3 gear ratio pair. Bore sizes range from 6 mm (0.24 in) to 25 mm (0.98 in), with keyway options available on larger bores for positive shaft engagement.
Typical use cases include right-angle gearbox assemblies for DIY CNC machines, custom conveyor drives requiring a 3:1 speed reduction, robotic arm joints needing compact 90-degree torque transmission, and small-scale industrial automation prototypes where a hardened bevel gear set reduces backlash and extends service life.
Machined from C45 steel for a balance of machinability and mechanical strength, delivering reliable torque transmission in both light-duty and moderate-load applications.
The blackening treatment increases surface hardness and corrosion resistance, extending gear life in environments with occasional moisture or debris exposure.
Available in Module 1, 1.5, and 2 to suit different torque and speed requirements. Each module pairs a 15-tooth pinion with a 45-tooth wheel for a fixed 3:1 reduction ratio.
Larger bore variants include a precision-cut keyway (4 mm, 5 mm, 6 mm, or 8 mm depending on bore size) to prevent shaft slippage under torque — critical for high-cycle or reversing-load applications.
Bore options span 6 mm through 25 mm (0.24–0.98 in), covering the most common metric shaft sizes used in hobby CNC, robotics, and small automation builds.
Bevel gear geometry enables smooth right-angle torque transfer, making these gears ideal for changing drive direction in compact mechanical assemblies without additional shafting.
| Gear Type | Straight Bevel Gear |
|---|---|
| Material | C45 Medium-Carbon Steel |
| Surface Treatment | Hardened Black (Blackening) |
| Module Options | Module 1 / Module 1.5 / Module 2 |
| Tooth Count (Pinion) | 15 Tooth |
| Tooth Count (Wheel) | 45 Tooth |
| Gear Ratio | 1:3 |
| Pressure Angle | See variant options |
| Bore Diameter Range | 6 mm – 25 mm (0.24 – 0.98 in) |
| Keyway Options | 4 mm / 5 mm / 6 mm / 8 mm (bore-dependent) |
| Outer Diameter | See variant options |
| Face Width | See variant options |
| Quantity per Order | 1 pc (single gear) |
Module size determines the physical tooth size and the overall gear diameter. Module 1 gears are the smallest and suit light-load, high-speed applications. Module 1.5 is a mid-range option for moderate torque. Module 2 gears are larger and handle heavier loads. Match the module to your torque requirement and the space available in your assembly — gears of different modules cannot mesh together.
Yes. The 1:3 gear ratio is achieved by pairing the 15-tooth pinion with the 45-tooth wheel. Both gears must be the same module size to mesh correctly. You can order each separately and select the matching module and bore size for each shaft in your assembly.
Select the bore size that matches your shaft diameter. For light-duty or low-torque applications, a plain bore with a set screw is often sufficient. If your application involves high torque, reversing loads, or frequent start-stop cycles, choose a keyway bore variant — the keyway provides a positive mechanical lock between the gear and shaft, preventing rotational slippage.
C45 steel offers higher tensile strength and toughness than cast iron, making it more resistant to impact and shock loads. Compared to stainless steel, C45 has similar or higher hardness after heat treatment but lower corrosion resistance in wet environments. The hardened black finish on these gears adds a layer of surface protection suitable for most indoor and semi-protected outdoor applications.
The blackening (hardened black) surface treatment provides moderate corrosion resistance — sufficient for dry indoor use and occasional moisture exposure. For continuously wet, submerged, or chemically aggressive environments, additional lubrication or a protective coating is recommended. These gears are not rated for marine or food-grade applications without further treatment.
Yes. These gears are well-suited for DIY CNC right-angle drives, robotic arm joints, and custom automation builds. Select the module size that matches your torque and speed requirements, choose a bore that fits your motor or drive shaft, and use a keyway variant for any axis that experiences reversing loads or high duty cycles.
A light gear grease or lithium-based grease applied to the tooth faces is recommended for most applications. For high-speed, low-load setups, a light machine oil can also be used. Re-lubricate periodically based on your duty cycle — more frequent lubrication is needed in dusty or high-temperature environments to maintain smooth meshing and extend gear life.
