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When your drivetrain needs to change direction without losing torque, a mismatched or low-tolerance bevel gear set becomes the weakest link in your build. These 90° steel bevel gear pairs are engineered for makers, robotics builders, CNC hobbyists, and mechanical engineering students who need reliable right-angle power transmission in a compact, repeatable package.
Each set consists of a matched pinion and wheel gear pair machined from 45# carbon steel, hardened for wear resistance. Available in modulus values of 1.5 Mod, 2 Mod, 2.5 Mod, and 3 Mod, with tooth count combinations ranging from 15T+30T up to 18T+54T (1:2 gear ratio throughout). Bore diameters and face widths vary by modulus — see variant options for exact dimensional data.
Typical use cases include right-angle gearbox assemblies for DIY CNC router Z-axis drives, custom robotic arm joints requiring a 2:1 speed reduction, and educational mechanical engineering demonstration rigs where a precise 90° mesh angle is required.
| Product Type | 90° Bevel Gear Pair (Pinion + Wheel) |
|---|---|
| Gear Ratio | 1:2 |
| Shaft Angle | 90° |
| Material | 45# Carbon Steel |
| Available Modulus | 1.5 Mod / 2 Mod / 2.5 Mod / 3 Mod |
| Tooth Count (Pinion + Wheel) | 15T+30T / 16T+32T / 18T+36T / 20T+40T / 15T+45T / 16T+48T / 18T+54T |
| Bore Diameter | See variant options |
| Face Width | See variant options |
| Pressure Angle | 20° (standard metric) |
| Surface Finish | Machined, natural steel |
| Packing Quantity | 1 Pair (2 Pcs — 1 pinion + 1 wheel) |
| Application | Right-angle power transmission, robotics, CNC, DIY gearboxes |
Modulus (Mod) defines the tooth size and pitch diameter of the gear. A higher modulus means larger, stronger teeth capable of transmitting more torque, but also a physically larger gear. Match the modulus to your existing gear train — if you already have 2 Mod gears on your shaft, select 2 Mod here. If you are designing from scratch, choose based on your load requirements and available housing space.
All variants in this listing maintain a fixed 1:2 gear ratio — the pinion (smaller gear) has half the teeth of the wheel (larger gear). This means for every two rotations of the pinion, the wheel completes one rotation. The result is a 2× torque increase on the output shaft with a corresponding 2× reduction in output speed. This is useful for applications where you need more turning force at lower RPM.
These gears are machined from 45# carbon steel, which offers good tensile strength and surface hardness for moderate-load applications such as robotics joints, light CNC axes, and educational rigs. For heavy industrial loads or continuous high-torque operation, we recommend consulting a mechanical engineer to verify the gear's rated load capacity against your specific torque and speed requirements.
The gears are machined from carbon steel with a natural steel finish and do not include a corrosion-resistant coating. For use in humid or outdoor environments, we recommend applying a light machine oil or grease to the gear teeth and bore surfaces. If corrosion resistance is a primary requirement, consider stainless steel or brass gear alternatives.
Bore diameter varies by modulus and tooth count. Please check the specific variant's bore dimension before ordering to confirm compatibility with your shaft. If you need a custom bore size, standard machining operations (reaming or boring) can be performed on carbon steel gears by a local machine shop.
No — each order includes one matched pair: one pinion gear and one wheel gear. The two gears are pre-selected to share the same modulus and maintain the 1:2 tooth ratio, so they will mesh correctly straight out of the box. Simply select your desired modulus and tooth count combination above.
These are metric module gears designed for metric shaft systems. While the bore can be machined to an imperial dimension, the tooth profile (module pitch) is not compatible with imperial diametral pitch (DP) gears. Do not attempt to mesh these gears with DP-standard gears — the tooth profiles will not engage correctly and will cause rapid wear or damage.
