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When your build demands a reliable right-angle power transfer in a tight space, undersized or poorly machined bevel gears cause backlash, noise, and premature wear. Engineers, robotics builders, and RC hobbyists working with compact drivetrains need a miter gear that holds tight tolerances without adding bulk. These Module 0.5 brass bevel gears are designed for exactly that challenge.
Each gear is machined from brass, offering a balance of machinability, corrosion resistance, and low-friction meshing. The module (tooth pitch) is 0.5, with tooth counts of 20, 25, or 30 teeth. Outer diameter ranges approximately 11–16mm (0.43–0.63 in) depending on tooth count. Bore sizes available: 3mm, 4mm, 5mm, and 6mm. Gears are sold individually or in matched 1:1 pairs for 90° miter configurations.
Typical use cases include small robotic joint drives requiring a 90° axis change, RC car and truck differential assemblies needing module 0.5 miter gears, and precision instrument mechanisms where a compact brass bevel gear with low backlash is critical for accurate motion transmission.
Machined from brass for reliable corrosion resistance, smooth meshing, and long service life in both dry and lightly lubricated environments.
Standard Module 0.5 tooth geometry ensures accurate meshing with compatible gears, minimizing backlash in compact drive assemblies.
Engineered for true 90° right-angle power transmission at a 1:1 ratio — ideal for direction-change applications without speed reduction.
Available in 20T, 25T, and 30T to suit different torque and space requirements within the same Module 0.5 system.
Four bore diameter options (3mm, 4mm, 5mm, 6mm) accommodate a wide range of motor and shaft sizes common in robotics and RC builds.
Order as 1 pcs for replacement or as 2 pcs matched pair for a complete 90° miter gear set — both options available per variant.
| Module | 0.5 |
|---|---|
| Tooth Count | 20T / 25T / 30T (see variant options) |
| Pressure Angle | 20° |
| Shaft Angle | 90° |
| Gear Ratio | 1:1 |
| Material | Brass |
| Bore Diameter | 3mm / 4mm / 5mm / 6mm (see variant options) |
| Outer Diameter (approx.) | ~11mm–16mm (0.43–0.63 in), varies by tooth count |
| Face Width | See variant options |
| Surface Finish | Natural brass (uncoated) |
| Quantity per Order | 1 pcs or 2 pcs (see variant options) |
All three options use Module 0.5 and pair at 1:1 ratio, so the tooth count mainly affects the outer diameter and torque capacity. A 20T gear has a smaller diameter (~11mm) and suits very compact builds. A 30T gear (~16mm OD) handles slightly more torque and is easier to align. Choose based on the space available in your assembly and the shaft center distance you need.
No. For a true 1:1 miter configuration at 90°, both gears in the pair must have the same tooth count. Mixing tooth counts (e.g., 20T with 25T) will change the gear ratio and alter the shaft center distance, causing improper meshing. Always pair identical tooth counts.
Select the bore size that matches your shaft diameter exactly. Available options are 3mm, 4mm, 5mm, and 6mm. If your shaft is between sizes, choose the smaller bore and ream or machine to fit — do not force a larger bore onto a smaller shaft. A set screw or keyway is recommended to secure the gear on the shaft.
Brass Module 0.5 bevel gears are well-suited for light-to-medium duty robotics joints, RC differentials, and precision instrument drives. They are not intended for high-shock or heavy industrial loads. For high-torque applications, consider a larger module (e.g., Module 1.0 or higher) or a steel gear.
Brass offers good natural corrosion resistance in most indoor and light-outdoor environments without any coating. It outperforms uncoated carbon steel in humid conditions. For harsh outdoor or marine environments, consider adding a light grease or oil film to the gear teeth for additional protection.
Brass gears can run dry in low-speed, light-load applications. For continuous or higher-speed operation, applying a thin layer of gear grease or light machine oil to the tooth faces will reduce wear and noise significantly. Avoid heavy greases that may attract debris in open-frame builds.
Selecting "1 pcs" gives you a single bevel gear — useful as a replacement for an existing pair or when you already have the mating gear. Selecting "2 pcs" gives you a matched pair of identical tooth-count gears ready to assemble as a complete 90° miter set. Both pieces in the 2 pcs option are the same tooth count and bore size as selected.
