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When a right-angle drive application demands smooth engagement and reduced noise, standard straight bevel gears fall short. Engineers, machine builders, and serious DIYers working on gearboxes, conveyors, printing equipment, or agricultural machinery need a spiral bevel gear that delivers consistent tooth contact and long service life. This Module 1.5 spiral bevel gear set is designed for exactly those demanding scenarios.
Each gear is machined from C45 medium-carbon steel and surface-hardened for wear resistance, finished with a black oxide coating. The module is 1.5 with a 1:2 gear ratio, available in 15/30 tooth and 18/36 tooth pairings. Bore sizes range from 8 mm (0.31 in) to 16 mm (0.63 in), with plain bore and keyway options (4 mm or 5 mm keyway) to suit different shaft configurations. Tooth count and bore size are selectable via variants.
Typical use cases include right-angle gearbox assemblies for CNC router axis drives, spiral bevel gear replacement for agricultural feed augers, and 90-degree power transmission in compact industrial automation rigs — all applications where a module 1.5 hardened bevel gear with keyway bore delivers reliable torque transfer.
| Material | C45 Medium-Carbon Steel |
|---|---|
| Surface Treatment | Hardened + Black Oxide |
| Module | 1.5 |
| Gear Ratio | 1:2 |
| Tooth Count (Pinion / Wheel) | 15/30 or 18/36 — See variant options |
| Pressure Angle | Typically 20° |
| Spiral Angle | Typically 35° |
| Bore Diameter | 8 mm / 10 mm / 12 mm / 14 mm / 15 mm / 16 mm — See variant options |
| Keyway | 4 mm or 5 mm (on applicable bore sizes) — See variant options |
| Spiral Direction | Left-hand or Right-hand — See variant options |
| Quantity per Order | 1 pc / 2 pcs / 3 pcs — See variant options |
| Finish Color | Black |
| Weight | See variant options |
Both pairings deliver a 1:2 speed reduction ratio. The 15/30 tooth set has a smaller pitch diameter, making it more compact and suited to tighter spaces. The 18/36 tooth set has a larger contact area, which can handle slightly higher torque loads and runs with lower tooth stress. Choose based on your available envelope size and torque requirement.
Each variant listing represents a single gear (pinion or wheel) at the selected tooth count. To build a complete 1:2 ratio drive, you need one 15-tooth gear paired with one 30-tooth gear, or one 18-tooth gear paired with one 36-tooth gear. Select the correct bore size for each shaft independently. Use the quantity option (1/2/3 pcs) if you need multiples of the same gear.
Spiral direction determines the axial thrust direction during operation. A left-hand pinion meshed with a right-hand wheel (or vice versa) is the standard pairing for a 90° drive. If you are replacing an existing gear, match the spiral hand of the original. If designing a new system, consult your gearbox layout to determine which combination produces the desired thrust direction.
These gears are machined from C45 steel with surface hardening, giving them good fatigue strength for moderate-duty applications. Exact torque capacity depends on operating speed, lubrication, and mounting rigidity. For precise load calculations, apply standard bevel gear rating methods (e.g., AGMA or ISO 10300) using the module, tooth count, face width, and material hardness. Contact us if you need application-specific guidance.
The black oxide finish provides mild corrosion resistance suitable for dry or lightly oiled indoor environments. For outdoor, humid, or washdown applications, additional protection such as grease packing, sealed housings, or periodic re-lubrication is recommended. If long-term corrosion resistance is critical, consider stainless steel alternatives.
Measure your shaft diameter precisely with calipers. Select the bore size that matches your shaft — plain bores (8 mm, 10 mm, 12 mm) suit standard shafts, while keyway bores (12 mm+4 mm key, 14 mm+5 mm key, 15 mm+5 mm key, 16 mm+5 mm key) are for keyed shafts requiring positive torque transmission without slipping. Ensure your shaft has a matching keyway cut if ordering a keyway bore variant.
Spiral bevel gears perform best with a gear oil or EP (extreme pressure) grease applied to the tooth flanks. For enclosed gearboxes, an ISO VG 220 or VG 320 gear oil is typical. For open drives or low-speed applications, a lithium-based EP grease works well. Ensure adequate lubrication at initial run-in and check periodically during service.
