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When your mechanical build demands reliable right-angle power transfer, a mismatched or undersized bevel gear can bring the whole project to a halt. Whether you're a mechanical engineer, a robotics hobbyist, or a workshop machinist, these 45# steel bevel gears are engineered to deliver consistent 1:1 ratio torque transmission across a wide range of shaft sizes and module configurations.
Each gear is machined from 45# medium carbon steel, offering a solid balance of strength and machinability. Available in Module 2, 2.5, 3, and 4, with tooth counts of 20T or 30T, and bore diameters ranging from 10 mm (0.39 in) to 50 mm (1.97 in). Every variant includes a precision-cut keyway and a set-screw tapped hole (M5 or M6 or M8 depending on size) for secure shaft locking.
Typical use cases include DIY CNC machine axis drives requiring a compact 90° gear change, custom conveyor or actuator systems needing a 1:1 bevel gear pair for right-angle drive, and robotics or automation builds where a keyed bevel gear set ensures zero-slip shaft coupling.
| Material | 45# Medium Carbon Steel |
|---|---|
| Module (Mod) | 2 / 2.5 / 3 / 4 |
| Tooth Count | 20T or 30T (per module) |
| Gear Ratio | 1:1 |
| Pressure Angle | 20° |
| Shaft Angle | 90° |
| Bore Diameter Range | 10 mm – 50 mm (0.39 in – 1.97 in) |
| Keyway | Included (standard DIN keyway per bore size) |
| Set Screw Thread | M5 / M6 / M8 (see variant options) |
| Finish | See variant options |
| Weight | See variant options |
| Sold As | Single gear (order 2 for a matched pair) |
The module (Mod) determines the gear tooth size and pitch — a higher module means larger, stronger teeth suited for higher torque. For light-duty or compact builds, Mod 2 or 2.5 is typical; for heavier loads, Mod 3 or 4 is recommended. The tooth count (20T or 30T) affects the outer diameter of the gear. Both gears in a 1:1 pair must share the same module and tooth count.
Select the bore diameter that matches your shaft's outer diameter exactly. The variant name shows the bore in millimeters (e.g., "Bore 20" = 20 mm bore). If your shaft is imperial, convert to mm first (e.g., 3/4 in ≈ 19 mm — choose Bore 19 if available). The keyway width follows standard DIN sizing for each bore.
These gears are machined from 45# medium carbon steel, which provides good tensile strength and surface hardness for general mechanical drive use. They are suitable for moderate-duty applications such as CNC machines, conveyors, and robotics. For very high-speed or heavy industrial loads, consider whether a heat-treated or hardened gear grade is required for your specific torque and RPM conditions.
45# steel has moderate corrosion resistance. For outdoor or humid environments, we recommend applying a light machine oil or grease coating during installation and periodically during service. If corrosion resistance is a primary requirement, consider stainless steel bevel gears instead.
Yes. Each listing is for a single bevel gear. To create a complete 1:1 right-angle drive, you need two gears of the same module and tooth count — one for each shaft. Simply add two units of the same size variant to your cart, or order one for each shaft bore size if your two shafts differ in diameter.
The set screw tapped hole allows you to lock the gear onto the shaft using a grub screw (not included), preventing axial movement and rotation slip. The thread size (M5, M6, or M8) depends on the bore size — it is listed in the variant name (e.g., "M6" at the end of the size string). Use a matching metric grub screw of the appropriate length for your hub depth.
These gears are designed for metric shafts. If you have an imperial shaft, you can use a metric-to-imperial shaft adapter or sleeve, or select the closest metric bore size and machine a custom key. For example, a 1-inch shaft (25.4 mm) would pair with a Bore 25 variant with minor clearance, or a Bore 25 with a custom adapter.
