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When your drivetrain demands a reliable right-angle power transfer, finding a bevel gear that meshes cleanly without backlash or premature wear is a real challenge. These 2 Module bevel gears are engineered for makers, robotics builders, CNC hobbyists, and mechanical engineers who need a consistent 90° 1:1 transmission ratio across a wide tooth range.
Each gear is machined from 45# medium-carbon steel, offering a solid balance of hardness and toughness. The 2 Module (Mod 2) pitch standard means a tooth pitch of 6.28 mm, with outer diameters spanning 32.5 mm (15T) to 82.5 mm (40T) — approximately 1.28 in to 3.25 in. Tooth counts available: 15T, 16T, 17T, 18T, 19T, 20T, 21T, 22T, 23T, 24T, 25T, 26T, 27T, 28T, 29T, 30T, 31T, 32T, 33T, 34T, 35T, 36T, 38T, and 40T.
Typical use cases include DIY gearbox builds requiring 90-degree shaft redirection, small-scale CNC axis drives needing a compact bevel gear pair, and robotics joint mechanisms where a 1:1 bevel gear set keeps torque transfer symmetrical. The 45# steel construction also suits light industrial automation fixtures and educational mechanical engineering models.
Machined from 45# steel for a reliable combination of surface hardness and core toughness, reducing tooth fatigue under cyclic loading in continuous-duty applications.
Standardized Mod 2 pitch (6.28 mm tooth pitch) ensures interchangeability with other Mod 2 components and predictable mesh geometry across the full 15T–40T range.
Engineered for perpendicular shaft arrangements with a 1:1 speed and torque ratio — ideal for symmetric drive systems where input and output RPM must remain equal.
Twenty-four tooth count options from 15T to 40T let you match the gear to your shaft spacing and torque requirements without custom machining.
Outer diameters range from 32.5 mm to 82.5 mm in predictable 2 mm increments per tooth, making layout and housing design straightforward for mechanical designers.
Available in single-piece, 2-piece, or 5-piece packs — order a matched pair for a single axis or stock up for multi-axis builds and prototyping runs.
| Module (Mod) | 2 |
|---|---|
| Tooth Count Range | 15T – 40T (24 options) |
| Outer Diameter Range | 32.5 mm – 82.5 mm (1.28 in – 3.25 in) |
| Mesh Angle | 90° |
| Gear Ratio | 1:1 |
| Tooth Pitch | 6.28 mm (Mod 2 standard) |
| Material | 45# Medium-Carbon Steel |
| Bore Diameter | See variant options |
| Hub Length | See variant options |
| Face Width | See variant options |
| Surface Finish | See variant options |
| Pack Quantity | 1 / 2 / 5 PCS (select above) |
For a 1:1 ratio drive, select the same tooth count for both the driving and driven gear. The tooth count affects the outer diameter and the center distance between shafts — higher tooth counts produce larger ODs and require more shaft spacing. Use the OD values (32.5 mm for 15T up to 82.5 mm for 40T) to calculate your housing dimensions before ordering.
These gears are designed and listed as a 1:1 ratio set. Pairing two gears with different tooth counts of the same module is mechanically possible in bevel gear theory, but the mesh geometry and contact pattern may not be optimized for ratios other than 1:1. For non-1:1 ratios, we recommend sourcing a matched bevel gear set designed for your target ratio.
45# medium-carbon steel (equivalent to AISI 1045) has a typical tensile strength of approximately 600–800 MPa in the normalized condition. These gears are suited for light-to-medium duty applications such as robotics, educational models, and small CNC machines. For heavy industrial loads or high-cycle fatigue environments, consider heat-treated or alloy steel alternatives.
45# carbon steel has limited inherent corrosion resistance. For indoor, dry environments these gears perform well with standard lubrication. If your application involves moisture, chemicals, or outdoor exposure, apply a rust-preventive grease or consider stainless steel alternatives. Periodic re-lubrication is recommended for long-term service life.
Yes — bevel gears must be used in matched pairs (same module, same tooth count for 1:1 ratio). The 2-piece pack is the most convenient option for a single axis. Choose the 5-piece pack if you are building multiple axes or want spares for prototyping. Single-piece packs are available if you need a replacement for an existing matched gear.
Bore diameter varies by tooth count variant — please refer to the variant options or contact us to confirm the bore size for your selected tooth count. The 45# steel construction is machinable, so bore enlargement or keyway cutting by a qualified machinist is feasible if the standard bore does not match your shaft diameter.
Module 2 is an internationally standardized gear pitch, so these gears are dimensionally compatible with other Mod 2 bevel gears of the same tooth count and pressure angle. However, mesh quality depends on manufacturing tolerances and pressure angle consistency. We recommend verifying the pressure angle (typically 20°) with your existing components before mixing brands in a precision application.
