2 Modulus Blue Nylon Spur Gear, Cylinder Flat Gears 12~100 Teeth, 6/8/10mm Bore

Divide the driven gear tooth count by the driving gear tooth count to get your reduction ratio. For example, pairing a 2M 20-tooth pinion with a 2M 60-tooth gear gives a 3:1 reduction. The extended 12–100 tooth range in this listing lets you achieve ratios from roughly 1.1:1 up to 8:1 in a single 2M standard. Confirm the resulting pitch-circle diameter fits within your chassis clearance before ordering.

Measure your motor or drive shaft diameter precisely with calipers. Choose the 6 mm bore for most NEMA 14 and small hobby stepper shafts, the 8 mm bore for NEMA 17 and mid-range stepper motors, and the 10 mm bore for larger NEMA 23 or servo output shafts. If your shaft has a keyway, verify the gear bore accommodates it or plan to add a set-screw collar.

No. The blue pigment is a dye added to the nylon compound during molding and does not alter the base mechanical properties of the PA material. Tensile strength, wear resistance, and self-lubricating characteristics remain consistent with standard natural-color nylon gears of the same module and tooth count.

Yes. These gears follow the standard 2M (Module 2, 20° pressure angle) tooth profile and will mesh correctly with any conforming 2M metal or plastic spur gear, pinion, or rack regardless of color or material. When pairing with a metal gear, the nylon gear typically acts as the sacrificial wear component, which is often desirable to protect more expensive metal parts.

These 2M blue nylon spur gears are well-suited for light-to-medium duty applications such as 3D printer drives, robotic joints, educational automation rigs, and small conveyor mechanisms. They are not recommended for high-torque industrial drives, impact loads, or continuous operation above approximately 60 °C. For heavy-duty or high-temperature environments, consider metal module gears instead.

In most light-load applications, nylon's self-lubricating properties eliminate the need for grease or oil. For higher-speed or higher-load continuous runs, a small amount of dry PTFE lubricant or light silicone grease on the tooth flanks can extend service life. Avoid petroleum-based oils, which can degrade nylon over time.

The blue color provides instant visual identification in multi-stage gearboxes, mixed-material assemblies, or classroom kits where distinguishing components quickly reduces assembly errors. It is also useful in builds where you want to color-code different gear ratios or stages. Mechanically, both versions perform identically — the choice is purely about visual organization and preference.