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When your motion-control build demands tight tolerances and reliable torque transfer, a poorly fitted gear can throw off your entire drivetrain. Makers, robotics engineers, and CNC hobbyists who need repeatable, low-backlash power transmission will find these Module 0.5 stainless steel spur gears an essential component for any precision mechanism.
Each gear is machined from stainless steel and features an integrated hub for secure shaft mounting. The module 0.5 pitch covers tooth counts from 20 to 60, with bore sizes ranging from 4 mm (0.16 in) to 12 mm (0.47 in) to suit a wide range of motor shafts. Outer diameters scale with tooth count, typically from approximately 11 mm (0.43 in) for a 20T gear up to approximately 31 mm (1.22 in) for a 60T gear.
These spur gears are well suited for small DC motor pinion drives in desktop CNC routers, servo-driven robotic joints requiring compact gear reduction, and precision automation fixtures where consistent mesh quality and corrosion resistance are critical.
Machined from stainless steel for corrosion resistance and durability in humid or lightly lubricated environments — no surface coating required.
Standardized Module 0.5 tooth profile ensures accurate mesh with any compatible M0.5 gear, minimizing backlash and noise in high-speed pinion applications.
The extended hub provides a larger gripping surface for set screws, delivering more secure shaft retention compared to hubless spur gears — critical for motor pinion use.
Eleven tooth-count options from 20 to 60 teeth let you dial in your gear ratio without sourcing from multiple suppliers — ideal for iterative robotics and CNC prototyping.
Seven bore options (4, 5, 6, 7, 8, 10, 12 mm) cover the most common small motor shaft diameters, reducing the need for custom bushings or adapters.
Consistent tooth geometry across the range supports smooth, low-backlash operation — suitable for position-sensitive CNC axes and servo-driven automation stages.
| Module | 0.5 |
|---|---|
| Tooth Count | 20 / 22 / 24 / 25 / 28 / 30 / 32 / 35 / 40 / 50 / 60 |
| Bore Size | 4 / 5 / 6 / 7 / 8 / 10 / 12 mm |
| Material | Stainless Steel |
| Pitch Diameter | Module × Tooth Count (e.g. 0.5 × 20 = 10 mm) |
| Outer Diameter | See variant options |
| Hub Included | Yes |
| Pressure Angle | 20° |
| Finish | Natural stainless (uncoated) |
| Quantity per Pack | 1 pcs |
| Weight | See variant options |
Your gear ratio is determined by dividing the driven gear tooth count by the driving gear (pinion) tooth count. For example, pairing a 20T pinion with a 40T gear gives a 2:1 reduction. Choose a tooth count that achieves your target speed or torque ratio while keeping the center distance practical for your build.
Measure your motor shaft diameter with calipers and select the matching bore size. Available bores are 4, 5, 6, 7, 8, 10, and 12 mm. If your shaft is metric and falls between sizes, choose the next size up and use a set screw with thread-locking compound, or consult a machinist for a custom bore.
Yes. Module 0.5 is a standardized pitch, so these gears will mesh correctly with any other Module 0.5 spur gear regardless of brand, provided the pressure angle is also 20°. Always verify the module and pressure angle of your existing gears before mixing.
Stainless steel offers a good balance of tensile strength, corrosion resistance, and machinability for small-module gears. For light-to-medium load applications such as desktop CNC routers, robotic arms, and automation fixtures, stainless steel Module 0.5 gears are well suited. For very high-torque or impact-load applications, consider a larger module or a hardened steel option.
Yes. Stainless steel provides inherent corrosion resistance without requiring additional plating or coating. These gears are suitable for use in humid environments, light misting, or applications where occasional contact with water or mild chemicals is expected. For submerged or highly corrosive environments, additional sealing of the assembly is recommended.
For Module 0.5 gears, the pitch diameter equals 0.5 × tooth count (in mm), and the outer (tip) diameter is approximately pitch diameter + 1 mm (i.e., module × 2). For example, a 20T gear has a pitch diameter of 10 mm and an outer diameter of approximately 11 mm; a 60T gear has a pitch diameter of 30 mm and an outer diameter of approximately 31 mm. Refer to the variant listing or contact us to confirm exact dimensions for your selected tooth count.
Stainless steel gears can operate dry for low-speed, light-load applications. For higher speeds or continuous-duty use, applying a light machine oil or grease to the tooth faces will reduce wear and noise and extend service life.
