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When your CNC router, 3D printer, or robotics project demands quiet, smooth power transmission without the weight penalty of metal, finding a reliable Module 1 spur gear with the right bore size can be a real bottleneck. Engineers, makers, and automation integrators who need consistent tooth geometry and corrosion resistance across a wide tooth-count range will find this POM plastic spur gear series purpose-built for the task.
Each gear is machined from white POM (polyoxymethylene / Delrin) — a self-lubricating engineering thermoplastic known for its low friction coefficient, dimensional stability, and resistance to moisture and mild chemicals. The hub-style body provides a secure shaft interface, with bore sizes ranging from 4 mm to 16 mm (approx. 0.16 in to 0.63 in) and tooth counts spanning 15 T to 40 T in Module 1 pitch. Overall gear outer diameter scales proportionally with tooth count, typically from approximately 17 mm (0.67 in) for 15 T up to approximately 42 mm (1.65 in) for 40 T.
Typical use cases include low-noise gear trains in desktop CNC machines and laser engravers, lightweight drive stages in educational robotics and STEM kits, and compact indexing mechanisms in automated dispensing or conveyor systems where metal gears would add unnecessary mass or corrode in humid environments.
Low-Noise Operation — POM plastic dampens vibration and gear mesh noise compared to metal alternatives, making these gears well-suited for quiet lab or desktop environments.
Lightweight Hub Design — The integrated hub reduces overall drivetrain weight without sacrificing shaft grip, critical for weight-sensitive robotic arms and gantry systems.
Corrosion & Chemical Resistance — POM resists moisture, oils, and mild solvents, eliminating the rust risk common with uncoated steel gears in humid or outdoor-adjacent environments.
Wide Tooth & Bore Selection — Available in 15 T through 40 T and bore sizes 4–16 mm, covering the majority of Module 1 shaft configurations found in hobby and light-industrial motion systems.
Self-Lubricating Material — POM's inherent lubricity reduces the need for external grease or oil, lowering maintenance intervals in enclosed or hard-to-access gear stages.
Consistent Module 1 Geometry — Precision-formed tooth profile ensures reliable mesh with standard Module 1 counterparts, supporting accurate gear ratio calculations in CNC and automation design.
| Module | 1 (1 mm/tooth) |
|---|---|
| Tooth Count Range | 15 T – 40 T (see variant options) |
| Bore Diameter Range | 4 mm – 16 mm (see variant options) |
| Outer Diameter (approx.) | ~17 mm (15 T) to ~42 mm (40 T) |
| Pressure Angle | 20° |
| Material | POM (Polyoxymethylene / Delrin) |
| Color | White |
| Hub Style | With hub |
| Gear Type | Spur gear (straight tooth) |
| Face Width | See variant options |
| Set Screw | See variant options |
| Operating Temperature | Typically –40°C to +90°C (–40°F to +194°F) |
| Quantity per Order | 1 pcs (per variant selection) |
Select tooth counts based on your required gear ratio. Divide the driven gear tooth count by the driving gear tooth count to get the ratio. For example, a 15 T pinion driving a 30 T gear gives a 2:1 reduction. Ensure both gears share the same Module (Module 1) and pressure angle (20°) for proper mesh.
Measure your shaft diameter with a caliper before ordering. The bore must match the shaft diameter precisely — a bore that is too large will cause slop and vibration, while one that is too small will not fit. Available bore sizes are 4, 5, 6, 7, 8, 10, 12, 14, 15, and 16 mm.
POM spur gears are suitable for light-to-medium duty applications such as CNC routers, 3D printers, robotics, and automated dispensing systems. They are not recommended for high-torque industrial drives or applications with sustained shock loads. For heavy-duty requirements, consider metal spur gears instead.
POM is resistant to moisture, oils, fuels, and many mild chemicals, making it suitable for humid or splash-prone environments. However, prolonged UV exposure can cause surface degradation over time. For fully outdoor applications, consider adding UV protection or using a covered enclosure.
Yes — as long as your existing gears are Module 1 with a 20° pressure angle, these POM gears will mesh correctly. Module 1 is a standardized pitch, so compatibility across materials (steel, aluminum, POM) is maintained provided the module and pressure angle match.
POM is self-lubricating, so these gears can run dry in many applications. For higher-speed or higher-load scenarios, a light application of PTFE-based or silicone grease can extend service life. Avoid petroleum-based greases that may swell or degrade the plastic over time.
Yes, Module 1 POM spur gears are commonly used in 3D printer drive trains, including extruder gear sets and Z-axis lead screw drives. Confirm the tooth count and bore match your printer's design specifications before purchasing.
