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When your build demands a reliable right-angle or angular power transfer, mismatched or low-tolerance gears become the weakest link in the drivetrain. Whether you are a robotics hobbyist, a CNC machine builder, or a mechanical engineering student, these steel bevel gear pairs give you the dimensional accuracy and material strength needed to transmit torque cleanly across intersecting shafts.
Each set consists of a matched pinion and gear pair machined from carbon steel, available in four module sizes — Mod 1.5, Mod 2, Mod 2.5, and Mod 3 — and four tooth-count pairings: 15/30, 16/32, 18/36, and 20/40, all maintaining a consistent 1:2 speed reduction ratio. Gear outer diameters range from approximately 22.5 mm (0.89 in) for the smallest Mod 1.5 / 15T pinion up to approximately 120 mm (4.72 in) for the largest Mod 3 / 40T gear, covering a wide span of torque and speed requirements.
Typical applications include DIY gearbox assemblies requiring a 2:1 reduction, right-angle drive systems in small CNC routers and laser cutters, robotic arm joint actuators needing compact angular transmission, and educational mechanical engineering models demonstrating bevel gear kinematics.
Machined from carbon steel for solid load-bearing capacity and resistance to deformation under sustained torque loads in mechanical drive applications.
Choose from Mod 1.5, 2, 2.5, or 3 to match your existing gear train pitch. All modules are available in four tooth-count pairings for flexible ratio matching.
Every pairing — 15/30, 16/32, 18/36, and 20/40 — delivers an exact 2:1 reduction, making speed and torque calculations straightforward for your drivetrain design.
Pinion and gear are supplied as a pre-matched set, ensuring correct tooth mesh geometry and eliminating the guesswork of sourcing compatible individual gears separately.
Bevel geometry enables smooth torque transfer between intersecting shafts, ideal for changing drive direction in compact robotic joints, gearboxes, and DIY mechanical assemblies.
From the compact Mod 1.5 / 15T & 30T pair to the larger Mod 3 / 20T & 40T set, this listing covers multiple build scales so you can prototype and scale without switching suppliers.
| Material | Carbon Steel |
|---|---|
| Gear Type | Straight Bevel Gear |
| Module (Mod) | 1.5 / 2 / 2.5 / 3 (see variant options) |
| Tooth Pairing | 15&30 / 16&32 / 18&36 / 20&40 (see variant options) |
| Speed Ratio | 1:2 |
| Pressure Angle | 20° |
| Shaft Angle | 90° |
| Pinion Outer Diameter | See variant options |
| Gear Outer Diameter | See variant options |
| Bore Diameter | See variant options |
| Surface Finish | Natural / Uncoated |
| Sold As | 1 Matched Pair (Pinion + Gear) |
Module (Mod) is the fundamental sizing unit for metric gears — it defines tooth size and pitch. A larger module means larger, stronger teeth suited for higher torque, while a smaller module gives finer teeth for compact, lower-torque applications. Match the module of this gear set to the module of any existing gears in your drivetrain. If you are designing from scratch, select based on the torque load: Mod 1.5 for light-duty models, Mod 2–2.5 for mid-range robotics, and Mod 3 for heavier mechanical assemblies.
All four pairings in this listing — 15/30, 16/32, 18/36, and 20/40 — deliver the same 1:2 speed reduction ratio. The difference lies in the physical size of the gears: a 15/30 pair is more compact, while a 20/40 pair is larger and can handle greater torque. Choose a larger tooth count if you need more load capacity or smoother meshing at higher speeds.
Yes. Carbon steel provides solid tensile strength and resistance to tooth deformation under sustained loads, making these bevel gear sets suitable for robotic arm joints, small CNC axis drives, and DIY gearbox builds. For very high-speed or heavy industrial loads, verify the specific torque rating against your application requirements before use.
Carbon steel is susceptible to surface oxidation if exposed to moisture without protection. For indoor or dry-environment applications, the natural finish is typically sufficient. If your application involves humidity or occasional moisture exposure, applying a light machine oil or grease to the gear teeth will protect the surface and also improve meshing lubrication.
Bore diameter varies by module and tooth count. Please refer to the variant detail or contact us to confirm the bore size for your selected module before ordering. If your shaft diameter differs, the bore can often be machined to size by a local machine shop.
No — gears must share the same module to mesh correctly. Mixing Mod 1.5 with Mod 2 gears, for example, will result in incorrect tooth engagement, noise, and accelerated wear. Always confirm that all gears in your drivetrain share the same module value.
Each purchase includes one matched pair — both the pinion (smaller gear) and the mating gear (larger gear) — as indicated by the tooth count pairing in the variant name (e.g., 15 Tooth & 30 Tooth). You do not need to purchase them separately.
