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When your motion system demands a quiet, corrosion-resistant gear that won't add unnecessary mass, standard metal pinions become a liability. Engineers, robotics builders, and maker-space professionals working on low-to-medium torque drives need a reliable plastic spur gear that fits a range of shaft diameters without custom machining. This 1 Mod 42-tooth blue nylon spur gear with stepped bore is engineered for exactly that scenario.
Each gear is machined from engineering-grade nylon (PA66), offering a balance of mechanical strength, self-lubrication, and dimensional stability. The module is 1 (Mod 1), tooth count is 42T, and the stepped bore accommodates shaft diameters from 6 mm (0.24 in) up to 17 mm (0.67 in) — covering the most common hobby and light-industrial shaft sizes. The blue color aids visual identification in multi-gear assemblies.
Typical use cases include 3D printer extruder and axis drives requiring low-noise 1 Mod gearing, small robotic arm joints and wheeled-robot drivetrains where weight savings matter, and DIY CNC or automation projects pairing this pinion with a 1 Mod rack or mating spur gear for linear or rotary motion.
Machined from PA66 nylon for a tensile strength of typically 80–85 MPa, outperforming standard ABS or POM in fatigue resistance under cyclic loading.
Nylon's inherent lubricity reduces friction against metal or plastic mating gears, cutting operational noise — ideal for desktop robotics and indoor automation.
The stepped bore profile fits shafts from 6 mm to 17 mm (0.24"–0.67"), eliminating the need for separate gear SKUs for each shaft diameter in your build.
Nylon density (~1.14 g/cm³) is roughly 7× lighter than steel, reducing rotational inertia and motor load in battery-powered or servo-driven systems.
Unlike steel gears, PA66 nylon is unaffected by moisture, mild chemicals, and humidity — suitable for lightly damp environments without surface treatment.
Order a single gear for prototyping, a pair for mirrored drive systems, or a 5-pack for production runs and spare-parts inventory — all at consistent per-unit quality.
| Module (Mod) | 1 |
|---|---|
| Number of Teeth | 42T |
| Pitch Diameter | 42 mm (1.65 in) |
| Outside Diameter (approx.) | 44 mm (1.73 in) |
| Face Width | See variant options |
| Bore Diameter Options | 6 / 8 / 10 / 12 / 14 / 15 / 16 / 17 mm |
| Bore Type | Stepped (plain bore; no keyway included) |
| Material | PA66 Engineering Nylon |
| Color | Blue |
| Pressure Angle | 20° |
| Gear Type | Spur (straight tooth) |
| Pack Quantity | 1 PCS / 2 PCS / 5 PCS (select above) |
| Operating Temperature | Typically −30°C to +100°C (−22°F to +212°F) |
| Corrosion Resistance | Yes — inherent nylon property |
Measure your shaft's outer diameter with calipers and select the matching bore option (6, 8, 10, 12, 14, 15, 16, or 17 mm). The stepped bore is a plain (round) bore — if your shaft uses a keyway or set-screw flat, you will need to machine that feature yourself after receiving the gear.
PA66 nylon gears are suited for low-to-medium torque applications. Exact load ratings depend on operating speed, temperature, and mating gear material. For continuous high-torque or high-RPM applications, consider a metal Mod 1 gear instead. These gears perform well in robotics, 3D printers, and light automation at typical hobby-grade torque levels.
Yes. PA66 nylon does not rust and resists mild moisture and many common chemicals. It is suitable for lightly damp or humid environments. Avoid prolonged immersion in water or exposure to strong acids/solvents, which can degrade nylon over time.
This gear meshes with any standard Module 1 (Mod 1) spur gear or rack, regardless of material (nylon, acetal, aluminum, or steel), as long as the pressure angle is 20°. Confirm the mating component's module and pressure angle before ordering.
Nylon is self-lubricating, so dry operation is acceptable for most light-duty applications. Adding a small amount of dry PTFE spray or light grease can extend service life in higher-cycle or higher-load scenarios, but it is not mandatory for typical use.
Choose 1 PCS for prototyping or single-axis builds. Select 2 PCS for symmetrical drive systems (e.g., dual-motor robots or paired extruders). The 5 PCS pack offers the best per-unit value for production runs, classroom kits, or keeping spares on hand for ongoing projects.
For a Mod 1 gear with 42 teeth: Pitch Diameter = Module × Teeth = 1 × 42 = 42 mm (1.65 in). Outside Diameter ≈ (Teeth + 2) × Module = 44 mm (1.73 in). These are standard gear geometry values and apply to all Mod 1 / 42T gears.
