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When your project demands a reliable right-angle drive — whether you're building a CNC axis, a robotic joint, or a custom gearbox — mismatched or imprecise bevel gears cause backlash, noise, and premature wear. These 45# steel bevel gears are machined to consistent tolerances, giving engineers, makers, and hobbyists a dependable solution for 90° shaft-to-shaft power transmission.
Each gear is manufactured from 45# medium-carbon steel, offering a solid balance of hardness and machinability. Available in three modulus options — Mod 1, Mod 1.5, and Mod 2 — with tooth counts ranging from 16T to 30T. Bore diameters span 5 mm (0.20 in) to 30 mm (1.18 in), with many variants offering a precision keyway slot (3 mm, 4 mm, 5 mm, 6 mm, or 8 mm) for positive shaft engagement without slippage.
Typical use cases include DIY differential drives for wheeled robots, right-angle gearbox assemblies in small machinery, CNC router Z-axis bevel drive conversions, and custom power-transmission rigs in maker workshops. Long-tail applications such as "Mod 2 bevel gear with keyway for stepper motor" or "90-degree steel gear pair for CNC" are fully covered across the variant range.
Medium-carbon 45# steel delivers the hardness needed for load-bearing drives while remaining machinable for custom bore finishing if required.
Choose Mod 1, Mod 1.5, or Mod 2 to match your existing gear train. Tooth pitch scales proportionally, ensuring correct mesh with paired gears of the same modulus.
Precision-cut 45° bevel tooth geometry produces a true 90° intersecting shaft angle, essential for right-angle gearboxes and differential assemblies.
Bore diameters from 5 mm to 30 mm (0.20–1.18 in). Many variants include a machined keyway (3–8 mm) for positive, slip-free shaft coupling.
Four tooth-count options (16T, 20T, 25T, 30T) let you tune your gear ratio. Pair two gears of different tooth counts to achieve the ratio your application needs.
Each gear is machined to repeatable dimensional standards, reducing the need for shimming or custom fitting when used in standard bevel-gear housings.
| Material | 45# Medium-Carbon Steel |
|---|---|
| Modulus (Mod) | 1 / 1.5 / 2 (see variant options) |
| Number of Teeth | 16T / 20T / 25T / 30T (see variant options) |
| Shaft Angle | 90° |
| Tooth Angle (Bevel) | 45° |
| Bore Diameter | 5 mm – 30 mm / 0.20 in – 1.18 in (see variant options) |
| Keyway Width | 3 mm / 4 mm / 5 mm / 6 mm / 8 mm (keyway variants only) |
| Pressure Angle | 20° (standard) |
| Surface Finish | Machined, natural steel |
| Weight | See variant options |
The Modulus (Mod) defines the tooth size and pitch. You must pair two gears of the same Modulus — a Mod 1 gear will only mesh correctly with another Mod 1 gear. Choose based on the load and space available: Mod 1 suits light-duty, compact drives; Mod 1.5 is a versatile mid-range option; Mod 2 handles heavier loads and larger shaft diameters.
Yes. Pairing gears of different tooth counts within the same Modulus gives you a gear ratio. For example, a 20T driving a 30T produces a 1:1.5 reduction ratio. Both gears must be the same Modulus for correct mesh.
A plain bore is a smooth cylindrical hole — the gear is typically secured with a set screw or press fit. A keyway bore has a rectangular slot machined into the bore wall; a matching key inserted between the shaft and gear prevents rotational slippage under torque. For power-transmission applications with significant torque, a keyway variant is recommended.
45# steel is a medium-carbon structural steel with a tensile strength typically in the range of 600–800 MPa after standard heat treatment. These gears are suited for moderate continuous loads in robotics, light machinery, and DIY drives. For very high-torque or high-speed industrial applications, consider gears made from alloy steel or with surface hardening.
45# steel has limited inherent corrosion resistance. For indoor or dry environments, the machined surface is adequate. If used in humid, outdoor, or washdown environments, apply a light machine oil or consider a protective coating after installation to prevent surface rust.
Measure your shaft diameter with a vernier caliper. Select the bore option that matches your shaft diameter exactly. If you need a keyway, also confirm the keyway width matches your shaft key. For shafts between standard sizes, choose the next larger bore and use a set screw or custom key to secure the gear.
Yes, bevel gears work in meshing pairs. You need two gears of the same Modulus oriented at 90° to each other. You can choose the same or different tooth counts depending on whether you want a 1:1 ratio or a speed/torque reduction. Each listing sells individual gears, so add two to your cart — one for each shaft.
