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When your robotics project, 3D printer extruder, or small automation build demands a lightweight, low-noise gear that meshes cleanly without lubrication, sourcing the right plastic pinion can be a frustrating bottleneck. This 1 Module 19-tooth blue nylon spur gear with step bore is engineered for makers, hobbyists, and small-scale machine builders who need a dimensionally consistent, drop-in gear solution across a range of shaft sizes.
Each gear is machined from engineering-grade nylon (PA66 or equivalent), offering a balance of rigidity and self-lubricating properties. The stepped bore design accommodates bore diameters of 5 mm (0.197 in), 6 mm (0.236 in), 6.35 mm (0.250 in / 1/4 in), 7 mm (0.276 in), and 8 mm (0.315 in). With Module 1 and 19 teeth, the pitch diameter is 19 mm (0.748 in) and the outer diameter is approximately 21 mm (0.827 in). Gear face width is typically 10–15 mm depending on the specific variant.
Typical use cases include: RC car and robot drivetrain reduction stages where a quiet, lightweight 1M plastic spur gear is preferred over metal; 3D printer extruder idler and drive gear replacements requiring a 19-tooth module 1 nylon pinion; and small conveyor or automation jigs where a corrosion-resistant plastic gear with step bore eliminates the need for a keyway or set-screw hub.
| Module | 1 (1M) |
|---|---|
| Number of Teeth | 19T |
| Pitch Diameter | 19 mm (0.748 in) |
| Outer Diameter (approx.) | 21 mm (0.827 in) |
| Bore Diameter Options | 5 mm / 6 mm / 6.35 mm / 7 mm / 8 mm |
| Face Width | See variant options |
| Hub Style | Stepped bore (no keyway) |
| Material | Engineering nylon (PA66-class) |
| Color | Blue |
| Pressure Angle | 20° |
| Gear Type | Spur (straight tooth) |
| Pack Quantity | 1 / 2 / 5 / 10 PCS (select above) |
| Weight (per piece, approx.) | See variant options |
Match the bore to your shaft's outer diameter. Common motor shaft sizes: 5 mm (many small DC and stepper motors), 6 mm (standard hobby and NEMA 17 variants), 6.35 mm / 1/4 in (US-standard shafts and some servo motors), 7 mm (mid-range DC motors), 8 mm (larger stepper and servo motors). If your shaft is between sizes, choose the next size up and use a shaft collar or set-screw hub to secure the gear.
Engineering nylon (PA66-class) is rated for moderate continuous loads in light-duty applications such as 3D printers, small robots, and automation jigs. For high-torque or shock-load applications, consider a metal gear of the same module. Nylon gears are best suited for speeds under ~500 RPM and torques within the gear's rated face-width capacity. Avoid sustained operation above 60 °C as nylon softens under prolonged heat.
Yes. Nylon is inherently resistant to moisture, mild acids, and oxidation. It will not rust or corrode in humid or wet environments. However, nylon can absorb a small amount of moisture over time, which may cause minor dimensional changes. For precision applications in very wet conditions, allow for this tolerance or seal the gear housing.
Yes. Module 1 is a standardized tooth profile. This 19T nylon spur gear will mesh correctly with any Module 1 rack, spur gear, or compatible helical gear regardless of material (steel, aluminum, or nylon), as long as the pressure angle is 20°. Verify the pressure angle of your mating gear before assembly.
In most light-duty applications, no lubrication is required — nylon is self-lubricating. For higher-speed or higher-load pairings with metal gears, a light application of dry PTFE spray or white lithium grease can extend service life. Avoid petroleum-based oils that may degrade nylon over time.
The stepped bore design provides a snug fit on the shaft. For additional security, use a radial set screw (M2–M3 depending on bore size) tapped into the hub, or apply a small amount of thread-locking compound between the bore and shaft. For applications with reversing loads, a set screw is strongly recommended to prevent slipping.
For prototyping or a single repair, the 1 PCS or 2 PCS pack is the most cost-effective entry point. For small production runs or to keep spares on hand, the 5 PCS or 10 PCS packs offer a lower per-unit cost. Check the price-per-piece across pack sizes shown in the variant selector above to find the best value for your volume.
