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When a sloppy gear mesh causes vibration, noise, or premature wear in your drivetrain, the root cause is almost always a mismatch in module, tooth count, or cut geometry. Makers, engineers, and hobbyists who build motorized assemblies, CNC axes, or custom gearboxes need a bevel gear they can trust to transfer torque cleanly across a 90° shaft angle without backlash surprises.
These 2.5 module steel bevel gears are machined from carbon steel with a helical (umbrella-tooth) tooth profile. The range covers 15 to 30 teeth, with pitch circle diameters from 40.6 mm (≈1.60 in) up to 78.1 mm (≈3.07 in). Each gear is available individually or in multi-piece sets of 4 or 6 for builds that require matched pairs or spares.
Typical use cases include right-angle power transmission in DIY electric vehicles and e-bikes, bevel gear sets for CNC router Z-axis drives, and replacement motor gears in robotics platforms and automated conveyor systems — all applications where a 2.5M helical bevel gear delivers quieter engagement than straight-cut alternatives.
Machined from carbon steel for reliable strength and wear resistance across continuous-duty motor and drivetrain applications.
The angled tooth cut increases contact ratio compared to straight bevel gears, reducing noise and vibration at operating speed.
Sixteen tooth-count options from 15T (D40.6 mm) to 30T (D78.1 mm) let you dial in the exact gear ratio your build requires.
Bevel geometry transfers rotational force cleanly between intersecting shafts, making these gears ideal for right-angle drive configurations.
Order as a single piece for prototyping, or choose 4-piece or 6-piece sets for matched-pair assemblies or production runs with spares.
Consistent module and pressure angle across the full range ensures predictable mesh with any standard M2.5 mating bevel gear.
| Module | 2.5M |
|---|---|
| Tooth Count Range | 15T – 30T (16 options) |
| Pitch Circle Diameter Range | 40.6 mm – 78.1 mm (≈1.60 – 3.07 in) |
| Tooth Profile | Helical (Umbrella Tooth / Spiral Bevel) |
| Shaft Angle | 90° |
| Material | Carbon Steel |
| Surface Finish | See variant options |
| Bore Diameter | See variant options |
| Hub Length | See variant options |
| Pressure Angle | See variant options |
| Available Quantities | 1 pcs / 4 pcs / 6 pcs |
| Weight (per piece) | See variant options |
The tooth count determines your gear ratio when paired with a mating bevel gear. Divide the driven gear's tooth count by the driving gear's tooth count to get the ratio. For a 1:1 ratio (equal speed, direction change only), select the same tooth count on both gears. For speed reduction, choose a larger tooth count on the driven side. All options in this listing share the same 2.5 module, so any two sizes will mesh correctly as long as the module matches.
These gears are machined from carbon steel, which offers a good balance of tensile strength, machinability, and wear resistance for motor and drivetrain use. Carbon steel bevel gears are suitable for moderate-to-high torque applications. If your application involves high moisture exposure or corrosive environments, consider adding a protective coating or lubricant after installation.
Carbon steel has moderate corrosion resistance. For outdoor or high-humidity environments, we recommend applying a gear lubricant or anti-rust coating to the tooth surfaces and bore. If long-term corrosion resistance is a primary requirement, look for stainless steel or brass bevel gear alternatives.
Yes — as long as your existing gear is also 2.5 module (M2.5) with a matching pressure angle and the same shaft intersection angle (90°), these gears will mesh correctly. Module is the universal standard for gear compatibility. Always verify the module and pressure angle of your mating gear before ordering.
Bore diameter varies by tooth count and is listed in the variant details. Carbon steel gears can be bored out or keyway-cut by a machine shop if the standard bore does not match your shaft. Do not exceed the recommended maximum bore for the hub diameter of your selected tooth count, as this can compromise wall thickness and structural integrity.
Helical (umbrella-tooth) bevel gears have angled teeth that engage progressively rather than all at once, which increases the contact ratio. This results in smoother, quieter operation and reduced impact loading on each tooth — particularly noticeable at higher RPMs. For motor-driven applications where noise and vibration matter, helical bevel gears are the preferred choice over straight-cut designs.
Order 1 piece if you are prototyping or replacing a single gear in an existing assembly. Choose the 4-piece set if you need two matched pairs (e.g., two right-angle drive assemblies). The 6-piece set is ideal for production builds, classroom kits, or any project where having spare gears on hand reduces downtime. Multi-piece sets offer a lower per-unit cost compared to buying singles.
