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When a stripped or mismatched gear brings your RC car, boat, or motorized toy to a dead stop, finding an exact-spec replacement becomes the bottleneck. Hobbyists, makers, and small-scale engineers who demand dimensional accuracy need a 0.5 mod spur gear they can trust to mesh cleanly and hold up under repeated load cycles.
These 0.5 module transmission spur gears are available in brass and iron variants, spanning 8 to 36 teeth across sizes including 1008A, 1010A, 1012, 1012A, 1014, 1015, and the compound 2036B. Bore diameters typically range from 1.9 mm to 3.175 mm (~0.075–0.125 in) depending on the selected size, with overall gear outer diameters scaling proportionally to tooth count. The 2036B variant is a dual-stage compound gear (10T driving / 36T driven) machined from iron for higher torque applications.
Typical use cases include RC drift and touring car gearbox rebuilds requiring 0.5 mod spur gear replacements, DIY robotic drive trains using small brass pinion and spur gear sets, and motorized toy mechanisms needing compact metal transmission gears with consistent pitch accuracy.
| Module (Mod) | 0.5 |
|---|---|
| Tooth Count Options | 8T, 10T, 12T, 14T, 15T, 10T/36T (compound) |
| Size Codes | 1008A, 1010A, 1012(2.3), 1012A(1.9), 1014(3.175), 1015(2.9), 2036B(Iron) |
| Bore Diameter | 1.9 mm / 2.3 mm / 2.9 mm / 3.175 mm (see variant options) |
| Material | Brass (1008A–1015 sizes); Iron (2036B compound) |
| Gear Type | Spur gear (single); Compound spur gear (2036B) |
| Outer Diameter | See variant options |
| Face Width | See variant options |
| Pressure Angle | 20° (standard for Mod 0.5 spur gears) |
| Finish | Natural brass / bare iron (uncoated) |
| Pack Quantities | 1 / 2 / 5 / 10 / 30 pieces |
| Application | RC cars, RC boats, toy motors, robotics, DIY drivetrains |
Match the bore diameter to your motor or shaft diameter first: 1012A(1.9) fits ~1.9 mm shafts, 1012(2.3) fits ~2.3 mm, 1015(2.9) fits ~2.9 mm, and 1014(3.175) fits ~3.175 mm (1/8 in) shafts. Then confirm the tooth count matches your existing pinion's module (must be Mod 0.5) and desired gear ratio. If unsure, measure your current gear's bore with a caliper before ordering.
Brass spur gears (1008A–1015) are well-suited for lightweight RC cars, boats, and toy motors running at typical hobby speeds. They provide good wear resistance and low noise. For higher-torque or higher-load applications — such as reduction stages — the iron 2036B compound gear offers greater strength. For extreme-duty racing applications, verify load ratings against your motor's output torque.
Brass has inherent corrosion resistance and performs well in occasional moisture exposure typical of RC boat use. For prolonged submersion or saltwater environments, apply a light gear lubricant or grease to the tooth faces and bore to extend service life. The iron 2036B variant is more susceptible to surface oxidation in wet conditions and benefits from a protective lubricant coating.
The 2036B is a two-stage compound spur gear machined from iron, combining a 10-tooth drive pinion and a 36-tooth driven gear in a single body. It is used in reduction gearboxes where you need to step down speed and multiply torque in a compact space — common in motorized toy mechanisms, small robot joints, and RC transmission stages. It replaces two separate gears and an idler shaft in many designs.
Yes, as long as the mating pinion is also Mod 0.5. Metal-to-plastic gear pairing is common in RC and toy applications; the softer plastic pinion typically acts as the sacrificial wear component, protecting the motor shaft. Ensure the plastic pinion's bore and tooth profile match before meshing. Avoid excessive preload, which accelerates wear on the plastic gear.
For a single repair or replacement, Pack of 1 or 2 is sufficient. If you are building multiple RC models or stocking a workshop, Pack of 5 or 10 offers a better per-unit value. Pack of 30 is suited for production runs, classroom robotics kits, or resellers who need consistent inventory of a specific size. Compare the per-unit price across pack sizes shown on the product page to find the best fit for your volume.
Use a digital caliper to measure: (1) bore diameter — the hole through the center; (2) outer diameter (OD) — tip to tip across the gear; (3) tooth count — count all teeth around the gear. For a Mod 0.5 gear, OD ≈ (tooth count + 2) × 0.5 mm. If your measured OD matches this formula, the gear is Mod 0.5 and compatible with these gears.
