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When your motor shaft needs a reliable, low-backlash mesh partner, undersized or poorly machined gears cause slippage, noise, and premature wear that stalls your entire project. Hobbyists building RC vehicles, robotics engineers prototyping drive trains, and small-machine designers all need a gear they can trust to hold tolerance run after run.
This 0.5 module brass spur gear features 34 teeth machined to DIN/JIS gear standards. The body is solid brass, offering a balance of machinability, corrosion resistance, and moderate strength. Bore options span 4 mm to 10 mm (approximately 5/32 in to 25/64 in), with select variants including a stepped bore (14 mm or 15 mm step) for shaft-shoulder registration. Outer diameter is approximately 17.5 mm (≈ 0.69 in); face width is typically 5–8 mm depending on bore variant.
Typical use cases include: pairing with 0.5 mod motor pinions in RC car steering and drive systems; building compact gear reduction stages in desktop CNC or 3D printer extruder assemblies; and integrating into educational robotics kits where a 34-tooth brass spur gear provides a known, repeatable gear ratio for torque-speed calculations.
| Module | 0.5 |
|---|---|
| Number of Teeth | 34T |
| Pitch Diameter | 17 mm (0.669 in) |
| Outer Diameter (approx.) | 18 mm (0.709 in) |
| Bore Diameter | See variant options (4 / 5 / 6 / 6.35 / 7 / 8 / 10 mm) |
| Face Width | See variant options |
| Step Bore Shoulder | 14 mm or 15 mm (select 8 mm bore variants only) |
| Material | Brass |
| Pressure Angle | 20° |
| Gear Standard | DIN / JIS Mod 0.5 |
| Finish | Natural brass (uncoated) |
| Pack Quantity | See variant options (1 / 2 / 5 / 10 PCS) |
Measure your motor or drive shaft diameter with calipers. Common hobby motor shafts are 3 mm, 4 mm, 5 mm, or 6 mm; stepper motors often use 5 mm or 6.35 mm (1/4 in) shafts. Select the bore that matches your shaft exactly — a loose fit will cause slippage under load. If your shaft is between sizes, choose the smaller bore and carefully ream or hone to final dimension.
The standard 8 mm bore runs straight through the gear hub. The stepped variants (8 mm bore with 14 mm step or 15 mm step) have a larger-diameter shoulder machined into one face of the hub. This shoulder registers against a shaft step or bearing face, providing positive axial positioning without a separate collar or circlip. Choose the stepped variant when your shaft has a matching shoulder diameter of 14 mm or 15 mm.
Yes. Module is a universal tooth-size standard — any two gears of the same module and pressure angle will mesh correctly regardless of material. This 0.5 Mod 34T brass gear will mesh with 0.5 Mod plastic, steel, or aluminum gears and racks. Confirm the mating gear is also 20° pressure angle (the most common standard) for optimal tooth contact.
Brass has a tensile strength of approximately 300–500 MPa depending on alloy, compared to 400–800 MPa for common carbon steel. For light-duty applications — RC vehicles, robotics, small automation, and educational projects — brass provides more than adequate strength while offering superior machinability, lower noise, and natural corrosion resistance. For high-torque or high-cycle industrial drives, consider steel alternatives.
Brass is naturally corrosion-resistant in most indoor and lightly humid environments and will not rust. For best performance and longevity, apply a light machine oil or white lithium grease to the tooth faces, especially in continuous-duty applications. Avoid heavy greases that can attract abrasive particles in dusty environments.
Gear ratio = driven teeth ÷ driver teeth. Pairing this 34T gear with a 17T motor pinion gives a 2:1 reduction (torque doubles, speed halves). With a 10T pinion the ratio is 3.4:1; with a 8T pinion it is 4.25:1. Use these ratios to calculate output RPM and torque for your specific motor and load requirements.
Yes. The 1 PCS pack option is available for every bore size, allowing you to verify fit, mesh quality, and dimensional accuracy before committing to a 5 or 10-piece order. Multi-piece packs offer a lower per-unit cost for production or replacement stock.
