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When your project demands a compact, low-backlash gear reduction in a tight space, finding a worm gear set that fits your shaft and delivers consistent torque transfer is the real challenge. Whether you are a robotics hobbyist, a maker building a motorized camera slider, or an engineer prototyping a small automation mechanism, this worm gear wheel and worm rod set gives you the dimensional accuracy and material choice to get the job done right.
This listing covers two module sizes — Mod 0.5 and Mod 1 — in two materials: natural POM plastic (white/natural) and blue nylon (PA66). Worm gear wheels are available from 15 to 80 teeth; worm rods are offered in B-Type configuration. Bore diameters range from 4 mm to 15 mm (approximately 0.16 in to 0.59 in). Outer diameter varies by tooth count and module: Mod 0.5 gears typically span 11–31 mm (0.43–1.22 in); Mod 1 gears typically span 17–82 mm (0.67–3.23 in). Quantities are available as 1 PCS, 5 PCS, or 10 PCS packs.
Typical use cases include small DC motor gearboxes for robotic joints, worm-drive linear actuators for DIY CNC or 3D printer Z-axis, low-speed high-torque drives in vending or dispensing mechanisms, and hobbyist RC or animatronic builds requiring a self-locking worm drive stage.
Available in Mod 0.5 (fine pitch, compact) and Mod 1 (standard pitch, higher torque capacity) to suit a wide range of drive ratios and space constraints.
Choose POM plastic for its low friction and dimensional stability, or blue nylon (PA66) for its toughness and impact resistance — both suitable for dry-running applications.
Worm gear wheels span 15 to 80 teeth (Mod 1) and 20 to 60 teeth (Mod 0.5), enabling gear ratios from approximately 15:1 to 80:1 with a single-start worm rod.
Bore options from 4 mm to 15 mm accommodate common motor shaft sizes used in hobby motors, stepper motors, and small DC gearmotors.
Order as a single piece for prototyping, or choose 5-pack or 10-pack options for small-batch production or spare-parts stocking.
B-Type worm rods in Mod 0.5 and Mod 1 are available to complete the worm drive pair, ensuring matched module engagement with the gear wheels in this listing.
| Module (Mod) | 0.5 / 1 |
|---|---|
| Tooth Count (Gear Wheel) | 15, 20, 25, 30, 35, 40, 50, 60, 80 (varies by Mod) |
| Bore Diameter | 4, 5, 6, 8, 10, 12, 14, 15 mm (varies by variant) |
| Gear Material | POM Plastic or Blue Nylon (PA66) |
| Worm Rod Type | B-Type (single-start) |
| Outer Diameter (Mod 0.5) | Typically 11–31 mm (0.43–1.22 in) — see variant options |
| Outer Diameter (Mod 1) | Typically 17–82 mm (0.67–3.23 in) — see variant options |
| Hub Width | See variant options |
| Pressure Angle | See variant options |
| Surface Finish | Machined / molded plastic, no coating |
| Pack Quantity | 1 PCS / 5 PCS / 10 PCS |
Module (Mod) is the ratio of pitch diameter to tooth count and must match between the worm rod and the worm gear wheel. Mod 0.5 is a finer pitch suited for compact, low-torque applications such as small robotics or camera mechanisms. Mod 1 has a coarser pitch and handles higher torque loads, making it better for heavier automation or motorized fixtures. Never mix Mod 0.5 gears with Mod 1 worm rods — they will not mesh correctly.
Measure your motor or drive shaft diameter with calipers before ordering. Available bore sizes are 4, 5, 6, 8, 10, 12, 14, and 15 mm. The bore should match your shaft diameter exactly for a secure fit. If your shaft is slightly undersized, a set screw or keyway arrangement can compensate, but an oversized bore cannot be reduced without machining.
POM (polyoxymethylene, also called Delrin or acetal) offers low friction, excellent dimensional stability, and good chemical resistance — ideal for dry-running, precision-fit applications. Blue nylon (PA66) is tougher and more impact-resistant but absorbs slightly more moisture, which can cause minor dimensional changes in humid environments. For most indoor robotics and automation projects, either material performs well; choose POM for tighter tolerances and nylon for higher shock loads.
Worm drives with a single-start worm rod and a high gear ratio (typically above 20:1) are generally self-locking, meaning the gear wheel cannot back-drive the worm rod. This is useful for holding a load in position without a brake. However, self-locking behavior depends on the lead angle, friction coefficient, and lubrication. For safety-critical applications, always verify locking behavior under your specific load and speed conditions.
Both POM and nylon are suitable for dry-running at low to moderate speeds and loads. For extended service life or higher duty cycles, a light application of PTFE-based or silicone grease is recommended. Avoid petroleum-based oils on nylon, as they can cause swelling over time. POM is more tolerant of a wider range of lubricants.
With a single-start B-Type worm rod, the gear ratio equals the number of teeth on the worm gear wheel. For example, a 40-tooth worm gear wheel paired with a single-start worm rod gives a 40:1 reduction ratio. Available tooth counts range from 15 to 80, so achievable ratios span 15:1 to 80:1 in a single stage.
The worm gear wheels and worm rods are listed as separate variant options within this product. Select the matching Mod size (0.5 or 1) for both the gear wheel and the worm rod to ensure correct meshing. You can add both to your cart by selecting each variant separately.
