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When your build demands a clean 90° direction change without slippage or backlash, finding a bevel gear that fits your shaft precisely is the real challenge. Whether you're a robotics builder, CNC hobbyist, or mechanical engineer prototyping a drive system, mismatched bore sizes or soft materials can ruin an otherwise solid design. These Mod 1.5 brass bevel gears are engineered for makers and professionals who need repeatable, low-noise right-angle transmission in compact assemblies.
Each gear is machined from solid brass, offering a balance of machinability, corrosion resistance, and moderate strength. The module (pitch) is 1.5, with 20 teeth and a 1:1 gear ratio, meaning both mating gears are identical — simplifying your BOM. Bore sizes range from 8mm to 15mm (approximately 0.31" to 0.59"), with select variants featuring a 4mm keyway for positive shaft locking. Overall gear diameter is approximately 33mm (≈1.30"), with a face width of typically 10–14mm.
These miter gears are well-suited for DIY gearbox builds requiring 90-degree shaft redirection, small-scale CNC axis drives where compact bevel gear sets reduce footprint, and robotics joint mechanisms needing a brass miter gear with keyway for torque-positive connections. The 1:1 ratio also makes them ideal for differential drive systems in RC vehicles and automation rigs.
| Module (Pitch) | 1.5 |
|---|---|
| Number of Teeth | 20 |
| Gear Ratio | 1:1 (Miter / Bevel) |
| Pressure Angle | 20° |
| Material | Brass |
| Pitch Diameter | 30mm (≈1.18") |
| Outside Diameter | Approx. 33mm (≈1.30") |
| Face Width | Typically 10–14mm |
| Bore Diameter | 8mm / 10mm / 12mm / 14mm / 15mm (see variant options) |
| Keyway | 4mm keyway available on select bore sizes (see variant options) |
| Shaft Angle | 90° |
| Finish | Natural brass (uncoated) |
| Weight (per piece) | See variant options |
| Quantity per Order | 1 pcs or 2 pcs (see variant options) |
Measure your motor or drive shaft diameter with a caliper. Select the bore size that matches exactly — for example, if your shaft is 10mm, choose the 10mm bore variant. If your application involves significant torque or reversing loads, consider the keyway variant (e.g., 10mm + 4mm Keyway) to prevent rotational slipping on the shaft.
The standard bore relies on a set screw or press fit to secure the gear to the shaft. The keyway variant includes a 4mm slot machined into the bore, which accepts a matching key on the shaft — this creates a positive mechanical lock that handles higher torque and prevents the gear from spinning independently of the shaft under load.
Yes. The mating performance depends on the module (1.5) and tooth count (20), not the bore size. You can pair a 10mm bore gear with a 15mm bore gear — they will mesh correctly at 90° as long as both are Mod 1.5 / 20-tooth bevel gears. Each gear mounts independently on its own shaft.
Brass bevel gears are well-suited for light-to-medium duty applications such as robotics, instrumentation, small CNC machines, and DIY automation. Brass offers good machinability and corrosion resistance, and runs quietly against steel shafts. For heavy-duty industrial loads or high-speed continuous operation, a steel or hardened alloy gear would be more appropriate.
Brass is inherently corrosion-resistant and will not rust. It may develop a natural patina (surface oxidation) over time in humid environments, but this does not affect mechanical performance. For applications in wet or outdoor environments, periodic lubrication with a compatible grease is recommended to extend service life.
Yes — a bevel gear drive requires two mating gears. Since this is a 1:1 miter gear set, both gears are identical (Mod 1.5, 20 tooth). You can select the "2 pcs" quantity variant to receive a matched pair in one order, or purchase two individual "1 pcs" variants if you need different bore sizes for each shaft.
A light machine oil or lithium-based grease applied to the tooth faces is sufficient for most applications. Avoid heavy petroleum greases that may attract debris. For low-speed, low-load applications, brass gears can often run dry for extended periods, but lubrication will reduce wear and noise over time.
