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When your build demands tight tolerances and reliable torque transfer in a small footprint, a poorly matched gear can cause backlash, premature wear, or outright failure. Engineers, hobbyists, and makers working on compact mechanical assemblies need a spur gear that holds its dimensions under load — and that is exactly what this 0.5 Module brass pinion spur gear is designed to deliver.
This gear features a 0.5 Module (Mod 0.5) tooth profile with 50 teeth, machined from brass for a balance of machinability, corrosion resistance, and moderate strength. The bore is available in six sizes — 4 mm, 5 mm, 6 mm, 8 mm, 10 mm, and 12 mm (approximately 0.157", 0.197", 0.236", 0.315", 0.394", and 0.472") — to suit a wide range of shaft diameters. Overall gear outer diameter is approximately 26 mm (≈1.02"), with a face width typically in the 5–8 mm range depending on the variant.
Typical applications include RC car transmission stages requiring a 0.5 mod spur gear replacement, small robotics joint drives where a brass pinion gear 50 tooth provides low-noise meshing, and precision instrument mechanisms or clock-style gear trains where dimensional consistency across a multi-gear stack is critical.
Machined from brass alloy for reliable corrosion resistance, smooth meshing noise characteristics, and ease of secondary machining if custom fitting is needed.
Standard Mod 0.5 tooth geometry ensures accurate meshing with any compatible 0.5 mod rack or gear. 50 teeth deliver a well-balanced ratio for compact drive stages.
Choose from bore diameters of 4, 5, 6, 8, 10, or 12 mm to match your shaft without additional boring or bushing work.
Available in 1, 2, or 5-piece packs so you can order exactly what your project requires — from a single replacement to a small production run.
Machined to maintain tooth pitch and bore concentricity, reducing backlash and ensuring repeatable performance across multiple gears in a gear train.
Suited for RC vehicles, robotics, automation mechanisms, scientific instruments, and DIY mechanical projects requiring a reliable 0.5 mod transmission gear.
| Module | 0.5 (Mod 0.5) |
|---|---|
| Number of Teeth | 50T |
| Material | Brass |
| Bore Diameter | 4 / 5 / 6 / 8 / 10 / 12 mm (see variant options) |
| Outer Diameter (approx.) | ~26 mm (~1.02") |
| Face Width (approx.) | Typically 5–8 mm |
| Pressure Angle | 20° (standard) |
| Tooth Profile | Involute spur |
| Finish | Natural brass (uncoated) |
| Pack Quantity | 1 PCS / 2 PCS / 5 PCS (see variant options) |
| Weight (per piece, approx.) | See variant options |
Measure your shaft diameter with calipers and select the matching bore option — 4, 5, 6, 8, 10, or 12 mm. The bore should be a close sliding fit on the shaft; you can secure the gear with a set screw, adhesive, or press fit depending on your application's torque requirements.
Yes. Any gear or rack with a 0.5 Module (Mod 0.5) tooth profile and a standard 20° pressure angle will mesh correctly with this gear. Confirm the module and pressure angle of your mating component before ordering.
Brass offers moderate tensile strength (typically 300–500 MPa depending on alloy) and is well-suited for light-to-medium load applications such as RC vehicles, robotics joints, and instrument mechanisms. For heavy-load or high-speed industrial drives, consider steel alternatives. Brass also provides inherent corrosion resistance without surface treatment.
Brass naturally resists oxidation and mild corrosion in indoor and light outdoor environments. It does not require additional coating for most hobby and light-industrial uses. Avoid prolonged exposure to strong acids, ammonia-based compounds, or salt spray environments without additional protection.
Yes. Because all gears share the same 0.5 Module and 50-tooth count, they are dimensionally consistent and will mesh with each other or with other Mod 0.5 components. Order the 5-piece pack for multi-stage gear train builds to ensure matched tolerances across the set.
The pack quantity determines how many individual gears you receive at the listed price. The 2-piece and 5-piece packs offer a lower per-unit cost compared to buying singles. Choose based on how many gears your project requires or how many spares you want to keep on hand.
These gears are supplied as plain-bore gears without a pre-drilled set screw hole or keyway. If your application requires a set screw, the brass material is easy to drill and tap. Contact us to confirm current bore specifications before machining.
