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When your motion system demands low noise, corrosion resistance, and a reliable mesh at Module 1, finding a spur gear that fits your shaft without custom machining is a real challenge. This 1 Mod 45-tooth blue nylon spur gear with a stepped bore is designed for hobbyists, robotics builders, and small-machine engineers who need a drop-in plastic pinion that mates cleanly with standard metal or nylon rack-and-pinion systems.
Each gear is machined from engineering-grade blue nylon (PA66 or equivalent), offering a self-lubricating, low-friction tooth surface. The stepped bore accommodates shaft diameters from 6 mm (0.24 in) to 20 mm (0.79 in), with a pitch diameter of 45 mm (1.77 in) and an overall gear width typically in the 10–15 mm (0.39–0.59 in) range. Module 1 tooth geometry ensures direct interchangeability with any M1 rack, pinion, or mating gear in your drivetrain.
Typical use cases include CNC router Z-axis drives, desktop 3D printer extruder idler stages, light-duty conveyor indexing systems, and educational robotics platforms where a quiet, non-sparking gear is required. The blue nylon construction also makes these gears ideal for food-adjacent or moisture-prone environments where metal gears would corrode.
| Module | 1 (M1) |
|---|---|
| Number of Teeth | 45T |
| Pitch Diameter | 45 mm (1.77 in) |
| Pressure Angle | 20° |
| Bore Diameter | 6 / 8 / 10 / 12 / 14 / 15 / 16 / 17 / 18 / 19 / 20 mm — See variant options |
| Gear Face Width | See variant options |
| Material | Engineering nylon (PA66-class) |
| Color | Blue |
| Gear Type | Spur gear (external tooth) |
| Bore Style | Stepped bore |
| Pack Quantity | 1 PCS / 2 PCS / 5 PCS — See variant options |
| Compatible Standard | Module 1 (M1) metric |
Select the bore size that matches your shaft's outer diameter exactly. For example, if your motor shaft is 8 mm, choose the 8 mm bore variant. If your shaft has a keyway or flat, confirm the bore style accommodates it — these gears feature a stepped bore, so check the step dimensions against your shaft shoulder before ordering.
Yes. Module 1 is a universal metric tooth standard, so this 45T nylon spur gear will mesh correctly with any M1 steel, aluminum, or nylon rack, pinion, or mating spur gear. Nylon-on-metal pairings are common in light-duty drives because the softer nylon tooth acts as the sacrificial wear element, protecting the metal gear.
Engineering nylon (PA66-class) has a tensile strength typically in the 70–85 MPa range, which is sufficient for light-to-medium duty applications such as 3D printer drives, small CNC axes, and robotics. For high-torque or high-speed industrial applications, a steel or brass gear is more appropriate. If you are unsure whether nylon suits your torque load, contact us with your RPM and torque figures.
Yes. Nylon is inherently resistant to moisture, mild oils, and common workshop chemicals. It will not rust or oxidize. Note that prolonged submersion in water can cause slight dimensional swelling in nylon; for fully submerged applications, confirm dimensional tolerances are acceptable for your design.
Nylon is self-lubricating under most light-duty conditions, so additional grease is often unnecessary. For higher-speed or higher-load applications, a light PTFE-based dry lubricant can extend tooth life without attracting dust. Avoid petroleum-based greases that may degrade nylon over time.
All three pack options contain identical gears of the same bore size and module. The 1 PCS option is ideal for prototyping or single-axis builds. The 2 PCS pack suits dual-axis or mirrored drive configurations. The 5 PCS pack offers the best per-unit value for production runs, classroom kits, or maintaining a spares inventory.
The gear hub is designed to accept a set screw for shaft retention. Confirm the hub wall thickness for your chosen bore size is sufficient for your set screw thread before assembly. If you need keyway or D-shaft compatibility, contact us to confirm before ordering.
