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When a drive system demands a reliable 90-degree direction change, a poorly matched bevel gear becomes the weakest link — causing vibration, premature wear, and costly downtime. Engineers, machinists, and serious DIY builders who need a dependable intersecting-axis solution will find this bevel gear set engineered to deliver consistent mesh accuracy across a wide range of torque loads.
Each gear is machined from 45# medium-carbon steel, offering a balanced combination of tensile strength and machinability. Available in three module sizes — Mod 4, Mod 5, and Mod 6 — with tooth counts ranging from 15 to 30 teeth and bore diameters spanning 12 mm (0.47 in) to 35 mm (1.38 in), including keyway variants (6 mm, 8 mm, and 10 mm keyways) for positive shaft locking. The 90° bevel angle enables direct perpendicular shaft coupling without additional gearbox housings.
Typical applications include right-angle power transmission in conveyor drives, CNC router axis changes, agricultural equipment gearboxes, custom robotics joint assemblies, and DIY lathe or mill cross-slide drives — anywhere a compact 90° gear mesh is required.
Mod 4, Mod 5, and Mod 6 available in a single listing — select the module that matches your mating gear for correct tooth mesh and load rating.
15 to 30 teeth across variants, allowing gear ratio flexibility from approximately 1:1 to 2:1 when paired with a matching bevel gear of different tooth count.
Plain bore (12–22 mm) and keyway bore variants (20 mm/6 mm key, 22 mm/6 mm key, 25 mm/8 mm key, 35 mm/10 mm key) for positive, slip-free shaft engagement under reversing loads.
Machined from 45# steel (equivalent to C45/1045 grade), delivering tensile strength typically in the 600–800 MPa range — suited for moderate-to-heavy industrial and workshop duty cycles.
Standard 90-degree pitch cone angle enables direct perpendicular shaft coupling, eliminating the need for worm gear reducers or complex housing adapters in right-angle drive layouts.
Each variant ships as 1 PCS — order the exact quantity needed for your build without overstocking. Mix module and tooth count variants in a single order for complete drive assemblies.
| Product Type | Bevel Gear (Straight Tooth) |
|---|---|
| Material | 45# Medium-Carbon Steel (C45 / 1045 equivalent) |
| Module (Mod) | 4 / 5 / 6 — see variant options |
| Tooth Count | 15 / 16 / 17 / 18 / 19 / 20 / 21 / 22 / 23 / 24 / 25 / 26 / 28 / 30 — see variant options |
| Shaft Angle | 90° |
| Bore Diameter | 12 mm – 35 mm (0.47 in – 1.38 in) — see variant options |
| Keyway Options | 6 mm / 8 mm / 10 mm keyway (select variants); plain bore also available |
| Pressure Angle | See variant options |
| Surface Finish | See variant options |
| Quantity per Order | 1 PCS |
| Weight | See variant options |
The module must match your mating bevel gear exactly — a Mod 4 gear will only mesh correctly with another Mod 4 gear. As a general rule, higher module numbers indicate larger, stronger teeth suited for heavier torque loads. Mod 4 is common in light-to-medium machinery and robotics; Mod 5 and Mod 6 are used in heavier industrial drives. Check your existing gear's module marking or measure tooth pitch to confirm before ordering.
No. Gears of different modules are not interchangeable and will not mesh correctly. Mixing modules causes tooth interference, rapid wear, and potential gear failure. Always pair gears of the same module number.
45# steel (equivalent to C45 or AISI 1045 medium-carbon steel) typically achieves tensile strength in the 600–800 MPa range in the normalized or quenched-and-tempered condition. It is well-suited for moderate-to-heavy duty mechanical drives, conveyor systems, and workshop machinery. For very high-speed or shock-load applications, consider whether additional heat treatment or a higher-alloy steel would be appropriate for your specific torque and RPM requirements.
45# carbon steel has limited inherent corrosion resistance compared to stainless steel. For indoor, dry, or lightly oiled environments these gears perform reliably. For humid, wet, or chemically exposed environments, apply a suitable lubricant or protective coating, or contact us to confirm whether a coated variant is available for your use case.
Measure your shaft's outer diameter precisely with calipers. Select the bore variant that matches your shaft diameter. If your shaft has a keyway slot, choose the corresponding keyway bore option (e.g., 20 mm bore with 6 mm keyway). Plain bore variants are suitable for press-fit, set-screw, or adhesive retention methods. Keyway variants provide positive torque transmission and are recommended for reversing or high-torque loads.
The gear ratio is determined by the tooth count of the two mating gears. For example, pairing a 15-tooth gear with a 30-tooth gear gives a 2:1 reduction ratio. A 20-tooth paired with a 20-tooth gives a 1:1 ratio (speed and torque unchanged, direction changed 90°). Select your driver and driven gear tooth counts based on the speed reduction or increase your application requires.
Each variant ships as 1 PCS (one gear). A functional 90° bevel gear drive requires at least two mating gears — a driver and a driven gear. If you need a matched pair, add two variants to your cart, ensuring both share the same module number. Mix tooth counts to achieve your desired gear ratio.
