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Finding a compact, lightweight bevel gear that fits small servo shafts without adding unnecessary mass to your build is a common challenge for robotics builders, RC hobbyists, and desktop CNC designers. These 1 Mod aluminum bevel gears deliver a clean 90-degree, 1:1 power transfer in a small, corrosion-resistant package that keeps your mechanism agile and precise.
Each gear is machined from aluminum alloy, offering a low-weight alternative to steel bevel gears for applications where mass matters. The 1 Module pitch covers tooth counts of 15, 20, 25, and 30 teeth, with pitch diameters of 15 mm (0.59 in), 20 mm (0.79 in), 25 mm (0.98 in), and 30 mm (1.18 in) respectively. Bore options range from 4 mm to 12 mm (0.16–0.47 in), including keyway variants (3 mm keyway for 8 mm bore, 4 mm keyway for 10 mm and 12 mm bore) for positive shaft locking. Available in 1 PCS or 2 PCS quantities to suit both prototyping and paired-drive builds.
Typical use cases include 90-degree right-angle drives in lightweight robotic arms and pan-tilt camera mounts, 1:1 bevel gear pairs for small CNC axis direction changes, and compact differential drive assemblies in RC vehicles and automation fixtures where aluminum's weight advantage over steel is critical.
Machined from aluminum alloy for a significantly lower mass than steel equivalents — ideal for weight-sensitive builds such as robotic arms, pan-tilt rigs, and portable automation fixtures.
Available in 15T, 20T, 25T, and 30T to match your required pitch diameter (15–30 mm / 0.59–1.18 in) and mesh clearance within your housing or frame design.
Engineered for perpendicular shaft drives with equal tooth counts on both gears, delivering balanced speed and torque in both directions without ratio change.
Select plain bore (4–12 mm) or keyway variants (8 mm + 3 mm keyway, 10 mm + 4 mm keyway, 12 mm + 4 mm keyway) for positive, slip-free shaft engagement under load.
Order a single gear for replacement or prototyping, or select the 2 PCS option to receive a matched pair ready for immediate 1:1 bevel drive assembly.
Aluminum's natural oxide layer provides resistance to light moisture and humidity, making these gears suitable for indoor automation and light outdoor hobby applications without additional coating.
| Module | 1 |
|---|---|
| Number of Teeth | 15 / 20 / 25 / 30 (see variant options) |
| Pitch Diameter | 15 mm / 20 mm / 25 mm / 30 mm (0.59–1.18 in) |
| Shaft Angle | 90° |
| Gear Ratio | 1:1 |
| Material | Aluminum alloy |
| Bore Diameter | 4 / 5 / 6 / 8 / 10 / 12 mm (see variant options) |
| Keyway Options | 8 mm bore + 3 mm keyway; 10 mm bore + 4 mm keyway; 12 mm bore + 4 mm keyway |
| Pressure Angle | 20° (standard metric) |
| Tooth Profile | Straight bevel |
| Surface Finish | See variant options |
| Quantity per Order | 1 PCS or 2 PCS (see variant options) |
Aluminum bevel gears are significantly lighter than steel equivalents of the same size, which matters in weight-sensitive applications like robotic arms, pan-tilt camera rigs, and portable automation fixtures. The trade-off is lower load capacity and wear resistance compared to steel. For light-duty, low-torque drives where mass reduction is a priority, aluminum is the right choice. For heavy-duty or high-torque applications, consider steel bevel gears instead.
Yes, a bevel gear pair requires two gears of the same module and tooth count to mesh at 90° in a 1:1 ratio. You can either select the 2 PCS variant (which ships two identical gears) or purchase two separate 1 PCS listings with the same tooth count and bore. Make sure both gears have compatible bore diameters for your two shaft sizes.
A plain bore is a smooth cylindrical hole that relies on a set screw or press fit to secure the gear to the shaft. A keyway bore includes a rectangular slot machined into the bore that accepts a matching key on the shaft, creating a positive mechanical lock that prevents rotational slipping under load. Keyway variants are recommended for applications with reversing loads or higher torque where a set screw alone may not be sufficient.
For 1 Mod gears, the pitch diameter equals the tooth count in millimeters (e.g. 20T = 20 mm PD). Choose the tooth count that fits your housing geometry and shaft spacing. Smaller tooth counts (15T, 20T) result in more compact assemblies; larger counts (25T, 30T) provide a larger pitch diameter and slightly more tooth contact area. All options maintain the same 1:1 ratio when paired with an identical gear.
Aluminum naturally forms a thin oxide layer that provides good resistance to light moisture and humidity. These gears are suitable for indoor automation, robotics, and light hobby use without additional coating. For environments with prolonged water exposure, salt spray, or chemical contact, applying a light lubricant to the tooth surfaces and bore is recommended to extend service life.
No. Bevel gears must be matched by module. A 1 Mod gear will only mesh correctly with another 1 Mod gear of the same tooth count. Mixing modules results in incorrect tooth geometry, poor contact, accelerated wear, and potential gear failure. Always confirm the module of your existing gear before ordering a replacement or mating gear.
Select the bore diameter that matches your shaft diameter exactly. Available plain bore options are 4, 5, 6, 8, 10, and 12 mm. If you need a keyway for positive shaft locking, choose the 8 mm + 3 mm keyway, 10 mm + 4 mm keyway, or 12 mm + 4 mm keyway variant. If your shaft diameter falls between available bore sizes, contact us before ordering to confirm the best fit.
