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When your mechanical project demands a reliable 90-degree power transmission without backlash headaches, finding the right bevel gear set can be a real challenge. Whether you're a robotics hobbyist, a CNC builder, or a mechanical engineering student, these 45# steel bevel gears deliver the dimensional accuracy and load capacity your drivetrain needs — available in multiple modules and tooth counts to match your exact design requirements.
Each gear is machined from 45# medium-carbon steel, offering a solid balance of hardness and toughness. The range covers Module 1 (Mod 1), Module 1.5 (Mod 1.5), and Module 2 (Mod 2), with tooth counts from 15 to 20 teeth per gear. Outer diameters span approximately 16.2 mm (0.64 in) to 42.5 mm (1.67 in) depending on the selected module and tooth count. All variants are designed for a 1:1 ratio at a 90° meshing angle.
Typical use cases include DIY robotic arm joints requiring a 90-degree bevel gear drive, CNC router axis change-of-direction assemblies, small automation equipment with right-angle power transmission, and educational mechanical engineering models needing a 45 steel bevel gear pair.
| Material | 45# Medium-Carbon Steel |
|---|---|
| Module Options | 1M, 1.5M, 2M |
| Tooth Count Options | 15, 16, 18, 19, 20 Teeth |
| Meshing Angle | 90° |
| Drive Ratio | 1:1 |
| Outer Diameter Range | 16.2 mm – 42.5 mm (0.64" – 1.67") |
| Shaft Bore Diameter | See variant options |
| Surface Finish | See variant options |
| Quantity per Pack | 1 Pcs / 2 Pcs / 5 Pcs |
| Application | Robotics, CNC, Automation, DIY Mechanical Builds |
The module must match between the two mating bevel gears. Module 1 (1M) is suited for lighter loads and compact builds; Module 1.5 (1.5M) handles moderate torque; Module 2 (2M) is appropriate for heavier-duty applications. Check your existing gear or design spec for the module value before ordering.
These gears are designed for a 1:1 ratio, meaning both gears in a meshing pair should have the same tooth count and the same module. Pairing different tooth counts of the same module will alter the pitch cone geometry and is not recommended for this product series.
45# steel (equivalent to C45 / SAE 1045) typically achieves a tensile strength of approximately 600–800 MPa in the normalized condition, with surface hardness that can be further improved by heat treatment. It provides a good balance of machinability, toughness, and wear resistance for gear applications under moderate loads.
45# carbon steel has limited inherent corrosion resistance. For environments with moisture or mild chemicals, we recommend applying a light machine oil coating during storage and use. If corrosion resistance is a primary requirement, consider stainless steel alternatives or apply an appropriate surface treatment.
Shaft bore diameter varies by module and tooth count. Please refer to the variant options on this page or contact us to confirm the bore size for your selected variant before ordering, especially if you need to match a specific shaft diameter.
Yes. A functional 90° bevel gear drive requires two mating gears of the same module and tooth count. The 2 Pcs quantity option is the most convenient choice for a complete pair. The 1 Pcs option is ideal if you need a replacement for an existing gear, and the 5 Pcs pack suits workshop stock or multi-axis builds.
The outer diameter (OD) is determined by the module and tooth count: OD = (Teeth + 2) × Module. For example, a 1M 15-tooth gear has an OD of (15+2)×1 = 17mm at the pitch reference, with the actual tip diameter listed in the variant options. Always verify the OD against your housing or mounting clearance before ordering.
