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Finding a 44-tooth spur gear in the correct module and bore size is a recurring challenge for RC builders, robotics engineers, and desktop CNC makers who need a specific tooth count for their gear ratio calculations. A mismatched module or an oversized bore causes backlash, shaft slippage, and premature tooth wear — problems that a correctly specified 0.5 mod brass spur gear eliminates from the start.
This gear is machined from solid brass and features 44 teeth on a 0.5 Module pitch, giving a pitch circle diameter of 22 mm and an outer diameter of approximately 22.5–23 mm (~0.886–0.906 in). Bore options of 4 mm (~0.157 in), 5 mm (~0.197 in), 6 mm (~0.236 in), 8 mm (~0.315 in), and 10 mm (~0.394 in) cover the most common motor and servo shaft diameters used in hobby and light industrial applications.
Typical use cases include: CNC axis drive stages where a 44T gear pairs with a smaller pinion to achieve a specific speed reduction; servo-driven robotic joints requiring a compact brass gear with low friction and quiet meshing; and RC vehicle transmission assemblies where a 44-tooth count provides a useful intermediate ratio between common 36T and 48T options.
| Module | 0.5 |
|---|---|
| Number of Teeth | 44T |
| Pitch Circle Diameter | 22 mm (0.866 in) |
| Outer Diameter (approx.) | 22.5–23 mm (0.886–0.906 in) |
| Bore Diameter | 4 / 5 / 6 / 8 / 10 mm (see variant options) |
| Face Width | See variant options |
| Material | Brass |
| Pressure Angle | 20° |
| Tooth Profile | Involute |
| Finish | Natural brass (uncoated) |
| Packing Quantity | 1 / 2 / 5 / 10 PCS (see variant options) |
Measure your motor or drive shaft diameter with a caliper and select the matching bore variant — 4, 5, 6, 8, or 10 mm. A bore that is too large will cause shaft runout and slippage under load; a bore that is too small cannot be mounted without machining. If your shaft is a non-standard size, choose the nearest bore and ream to fit.
Using the standard formula OD = (T + 2) × Module: OD = (44 + 2) × 0.5 = 23 mm. In practice, the finished outer diameter is approximately 22.5–23 mm (~0.886–0.906 in) depending on machining tolerance.
Brass is well-suited for light-to-medium duty applications including RC models, desktop CNC drives, servo-driven robotics, and instrumentation. It offers good machinability and low friction against steel or nylon mating gears. For continuous high-torque or high-RPM industrial drives, a steel gear would provide greater fatigue resistance.
Brass does not rust and has natural corrosion resistance in most indoor and light-outdoor environments. In salt-spray, marine, or chemically aggressive conditions, apply a light machine grease or oil to the tooth surfaces to extend service life and prevent surface tarnishing.
Any 0.5 Module gear or rack with a 20° pressure angle will mesh correctly with this gear, regardless of material (brass, steel, nylon, or acetal). Do not mix module sizes — a 0.5 Mod gear will not mesh correctly with a 0.4 Mod or 0.6 Mod component.
The 44-tooth count provides an intermediate gear ratio option between the common 36T and 48T sizes. This is useful when your drive system requires a specific speed reduction or torque multiplication that cannot be achieved with standard tooth counts. Calculate your required ratio (driver teeth ÷ driven teeth) to confirm 44T fits your design.
Yes. Each bore size is a separate variant. Add your chosen bore size and pack quantity to the cart, then return to the product page to add a different bore size variant. All items will be combined into a single order at checkout.
