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When your motion-control build demands smooth, low-noise 90° power transmission without the weight penalty of metal, most off-the-shelf gears either strip under load or generate disruptive vibration. Engineers, makers, and automation integrators working on CNC routers, robotic arms, and light-duty drive systems need a bevel gear pair that delivers reliable torque transfer while staying corrosion-resistant and easy to source in matched sets. These Module 1 nylon bevel gear pairs are designed exactly for that application.
Each listing covers a matched 1:2 ratio bevel gear pair machined from engineering-grade nylon (PA66-class). The umbrella-tooth (straight bevel) profile is cut to Module 1 (1 Mod) standard, with pinion tooth counts of 15T, 20T, 30T, or 40T paired at a 1:2 ratio. Bore options range from 5 mm (0.20 in) to 12 mm (0.47 in) to suit common motor and shaft diameters. Overall gear diameter varies by tooth count, typically spanning 15 mm–40 mm (0.59 in–1.57 in) across the range.
Typical use cases include: CNC axis drives requiring 90° direction change with minimal backlash; desktop robotic joint assemblies where weight and noise reduction are critical; and light automation conveyor systems needing corrosion-resistant power transmission in humid or chemically active environments. Long-tail applications also include 3D printer extruder gearboxes, RC vehicle differentials, and educational robotics kits.
Engineering-grade nylon (PA66-class) dampens vibration and reduces gear mesh noise compared to metal alternatives — ideal for desktop CNC machines, robotic arms, and any build where acoustic performance matters.
Nylon's low density (approximately 1.14 g/cm³) keeps rotating mass minimal, reducing inertia in servo-driven axes and improving dynamic response in motion-control applications.
Unlike steel or cast-iron gears, nylon resists moisture, mild acids, and lubricant degradation — making these gears suitable for humid workshops, food-adjacent automation, and environments where rust is a concern.
Supplied as a pre-matched 1:2 ratio bevel pair (e.g., 15T driver + 30T driven), eliminating the guesswork of sourcing compatible mates. Module 1 pitch ensures interchangeability with standard M1 gear tooling and mating components.
Available with bore diameters of 5 mm, 6 mm, 8 mm, 10 mm, and 12 mm to fit common stepper motor shafts, servo output shafts, and standard metric round stock without custom machining.
Umbrella-tooth (straight bevel) geometry delivers efficient torque transfer at a 90° shaft intersection — the standard configuration for CNC axis changes, differential drives, and right-angle gearbox assemblies.
| Material | Engineering-grade nylon (PA66-class) |
|---|---|
| Gear Type | Straight bevel gear (umbrella tooth) |
| Module | 1 (1 Mod) |
| Pressure Angle | 20° |
| Ratio | 1:2 (matched pair) |
| Tooth Count Options | 15T, 20T, 30T, 40T (pinion / driver gear) |
| Bore Diameter | 5 mm / 6 mm / 8 mm / 10 mm / 12 mm |
| Shaft Angle | 90° |
| Finish | Natural nylon (uncoated) |
| Weight | See variant options |
| Package Contents | 1 matched bevel gear pair (Pack of 1) |
The tooth count determines the gear ratio within the 1:2 pairing. All options in this listing maintain a 1:2 speed reduction ratio — the difference between 15T, 20T, 30T, and 40T is the physical size of the gear pair. Larger tooth counts produce larger-diameter gears capable of transmitting more torque. Choose based on the available space in your assembly and the torque load your application requires.
Match the bore diameter to your motor or shaft OD. Common stepper motor shafts are 5 mm or 6.35 mm (1/4 in); NEMA 23 steppers typically use 6.35 mm or 8 mm shafts; servo motors often use 8 mm, 10 mm, or 12 mm shafts. If your shaft diameter falls between bore sizes, a set-screw hub or shaft adapter is recommended. Select the bore that matches your shaft OD exactly — do not select an oversized bore without an adapter.
These nylon bevel gears are suited for light-to-medium duty applications such as desktop CNC routers, 3D printer drives, small robotic joints, and educational automation rigs. Nylon has a tensile strength of approximately 70–85 MPa and performs well under moderate, continuous loads. For heavy industrial machinery, high-torque servo drives, or applications with significant shock loading, metal bevel gears are recommended.
Nylon is self-lubricating to a degree due to its low surface friction coefficient, making it suitable for dry-running applications. However, for extended service life under continuous load, a light application of PTFE-based dry lubricant or white lithium grease at the gear mesh is recommended. Avoid petroleum-based oils that may degrade nylon over time.
Nylon (PA66-class) offers excellent resistance to moisture, mild acids, and common workshop chemicals. Unlike steel gears, these will not rust or corrode in humid conditions. Note that prolonged immersion in water can cause slight dimensional swelling in nylon; for fully submerged applications, verify dimensional tolerances after moisture absorption or consider acetal (POM) alternatives.
Each order (Pack of 1) includes one matched 1:2 ratio bevel gear pair — both the driver (pinion) and the driven gear are included. The gears are pre-matched to the correct Module 1 tooth profile and ratio, so no additional mate sourcing is required. Both gears in the pair share the same bore diameter as selected.
The bore sizes listed (5 mm, 6 mm, 8 mm, 10 mm, 12 mm) are metric. Common imperial shaft sizes and their metric equivalents: 1/4 in ≈ 6.35 mm (closest bore: 6 mm with light reaming, or use a 6.35 mm adapter), 5/16 in ≈ 7.94 mm (closest bore: 8 mm), 3/8 in ≈ 9.53 mm (closest bore: 10 mm). A shaft-to-bore adapter or set-screw collar is recommended when the imperial shaft does not match a listed bore exactly.
