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When your motor drive, robotic arm, or custom gearbox demands reliable torque transmission at a right angle, a mismatched or undersized gear becomes the weakest link in the entire system. Engineers, hobbyists, and small-scale machine builders who need consistent mesh quality across a range of shaft sizes will find these brass umbrella tooth bevel helical gears a dependable solution for both prototyping and production runs.
Each gear is machined from brass, offering a balance of machinability, moderate corrosion resistance, and low-friction meshing. The range covers module sizes 0.5M, 0.8M, 1M, and 1.5M with tooth counts of 15T, 20T, 25T, and 30T. Bore options span 3 mm (≈0.12 in) to 15 mm (≈0.59 in), including keyway variants (8 mm + 3 mm keyway, 10 mm + 4 mm keyway, 12 mm + 4 mm keyway) for positive shaft locking. Outer diameter varies by module and tooth count, typically ranging from approximately 12 mm (≈0.47 in) for 0.5M 15T up to approximately 48 mm (≈1.89 in) for 1.5M 30T.
Typical use cases include DC motor gearboxes requiring 90° power transmission, CNC router axis drives where compact bevel gearing saves space, robotics joint assemblies needing matched bevel pairs, and DIY lathe or milling attachments where a standard module gear is required for interchangeability.
Available in 0.5M, 0.8M, 1M, and 1.5M — covering a wide span of torque and speed requirements in a single product line.
Select the tooth count that matches your gear ratio target. Mix modules and tooth counts across a mating pair to achieve the reduction you need.
Bore options include plain round bores (3–15 mm) and keyway-cut bores (8 mm + 3 mm key, 10 mm + 4 mm key, 12 mm + 4 mm key) for positive, slip-free shaft engagement.
Brass provides good machinability, moderate corrosion resistance, and quieter operation compared to steel gears — well suited for indoor mechanical assemblies and light-duty drives.
The umbrella (straight bevel) tooth form enables smooth 90° power transmission between intersecting shafts, a standard configuration in motor gearboxes and right-angle drives.
Order 1, 2, 3, or 5 pieces per pack — ideal for single prototypes, matched bevel pairs, or small production batches without overstocking.
| Material | Brass |
|---|---|
| Gear Type | Umbrella Tooth Bevel (Straight Bevel) Helical |
| Module | 0.5M / 0.8M / 1M / 1.5M |
| Tooth Count | 15T / 20T / 25T / 30T |
| Bore Diameter | 3 / 4 / 5 / 6 / 8 / 10 / 12 / 14 / 15 mm; keyway options: 8+3 mm, 10+4 mm, 12+4 mm |
| Outer Diameter (approx.) | See variant options |
| Face Width (approx.) | See variant options |
| Pressure Angle | See variant options |
| Shaft Angle | 90° |
| Pack Quantity | 1 / 2 / 3 / 5 pcs |
| Finish | Natural brass (uncoated) |
| Application | Motor gearboxes, robotics, CNC drives, DIY mechanical assemblies |
Module (M) defines the tooth size and pitch. A larger module means larger, stronger teeth capable of transmitting more torque. For light-duty or small motors (under ~10 W), 0.5M or 0.8M is typically sufficient. For mid-range drives (10–50 W), 1M is a common choice. For heavier loads or larger shafts, 1.5M provides more tooth engagement area. Always match the module of both mating gears — mismatched modules will not mesh correctly.
Yes. Pairing a 20T driving gear with a 30T driven gear of the same module gives a 1.5:1 reduction ratio (the output shaft turns at 2/3 the speed of the input, with 1.5× the torque). Both gears must share the same module for correct meshing. Confirm the bore sizes match your respective shaft diameters before ordering.
A plain bore is a smooth cylindrical hole — the gear is typically secured with a set screw or press fit. A keyway bore has a rectangular slot machined into the bore wall; a matching key inserted between the shaft and gear prevents rotational slipping under load. Keyway variants (8+3 mm, 10+4 mm, 12+4 mm) are recommended for applications with significant torque or reversing loads where a set screw alone may not be sufficient.
Brass gears are well suited for light-to-medium duty applications — hobby motors, small robotics, instrumentation drives, and DIY gearboxes operating at moderate speeds and loads. Brass offers lower noise and better corrosion resistance than mild steel in indoor environments. For heavy industrial loads, high-speed continuous duty, or outdoor exposure, consider steel or stainless alternatives. If you are unsure whether brass suits your torque and speed requirements, contact us to confirm before ordering.
Measure your shaft diameter with a caliper to the nearest 0.1 mm. Select the bore option that matches — for example, a 6 mm shaft requires the 6 mm bore variant. For keyway shafts, match both the bore diameter and the keyway width (e.g., a shaft with a 4 mm key requires the 10+4 mm or 12+4 mm keyway bore). A bore that is too small will not fit; a bore that is too large will produce backlash and potential shaft damage.
Each listing sells individual gears, not pre-matched pairs. To build a 90° bevel drive, you need two gears of the same module — select the tooth counts that give your desired ratio, then order the appropriate quantity. Use the Pack Quantity option (1, 2, 3, or 5 pcs) to order both gears in a single transaction if they share the same model and bore configuration, or place separate variant selections for different bore sizes.
Brass has moderate natural corrosion resistance and performs well in dry indoor environments and low-humidity conditions. It is not recommended for continuous exposure to salt spray, acids, or high-moisture outdoor environments without additional protective coating. For such conditions, consider stainless steel or coated alternatives.
