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When your motion-control build demands reliable torque transfer with a compact footprint, sourcing the right worm gear set is critical. Engineers, robotics builders, and industrial maintenance teams working on speed-reduction assemblies need components that hold tight tolerances across repeated load cycles — and a mismatched module or tooth count can derail an entire project.
This listing covers a matched family of carbon steel worm wheel gears and worm gear shafts (worm rods) in Module 1, 1.5, 2, 2.5, 3, and 4, with worm wheel tooth counts ranging from 15T to 100T. Gear outer diameters range approximately 17–420 mm (0.67–16.5 in) depending on module and tooth count; worm rod lengths vary by module. All components are machined from carbon steel for strength and wear resistance.
Typical use cases include DIY CNC axis drives requiring a worm-gear speed reducer, robotic arm joints needing self-locking worm drive assemblies, and light industrial conveyor or actuator systems where a compact right-angle carbon steel worm gear set replaces a bulkier gearbox stage.
Six module sizes — 1, 1.5, 2, 2.5, 3, and 4 — cover light-duty hobby builds through medium-duty industrial drives in a single product family.
Worm wheel variants span 15 to 100 teeth, letting you dial in your target gear ratio without custom fabrication.
Machined from carbon steel for solid load-bearing capacity and wear resistance across continuous-duty speed-reduction applications.
Worm gear shafts (worm rods) are available in the same module sizes, enabling you to source a complete worm drive pair from one listing.
A 1.5 Mod 20T stepped-hub variant (hole 15 mm, key 5 mm) is stocked for direct shaft mounting without additional machining.
Each unit is sold as a single piece, so you order exactly the quantity your assembly requires — no forced multi-packs.
| Material | Carbon Steel |
|---|---|
| Module Range | 1, 1.5, 2, 2.5, 3, 4 |
| Worm Wheel Tooth Count | 15T – 100T (see variant options) |
| Component Types | Worm Wheel Gear / Worm Gear Shaft (Worm Rod) |
| Gear Outer Diameter | See variant options |
| Bore Diameter | See variant options |
| Keyway | See variant options |
| Pressure Angle | 20° (standard for metric worm gears) |
| Surface Finish | Machined, natural steel |
| Sold Per Order | 1 PCS |
| Weight | See variant options |
The module (Mod) is the fundamental sizing unit for metric gears — it equals the pitch diameter divided by the number of teeth. Match the module of your worm wheel to the module of your worm rod. For light loads and compact builds (robotics, small actuators), Mod 1 or 1.5 is typical. For heavier industrial drives, Mod 2–4 provides greater tooth strength and load capacity.
No. Worm wheels and worm rods must share the same module number to mesh correctly. Mismatched modules will result in improper tooth engagement, accelerated wear, and potential drive failure. Always select both components from the same module group.
For a single-start worm rod (the standard configuration), the gear ratio equals the number of teeth on the worm wheel. For example, a 40T worm wheel paired with a single-start worm rod gives a 40:1 reduction ratio. Higher tooth counts yield higher ratios and greater torque multiplication.
Carbon steel worm gear sets with a low lead angle (typical of single-start worms at Mod 1–2) are generally self-locking under static loads, meaning the output shaft cannot back-drive the input. Self-locking behavior depends on the specific lead angle and friction conditions. For safety-critical applications, always verify with a mechanical engineer.
Bore diameter and keyway dimensions vary by module and tooth count. One stocked variant (1.5 Mod 20T with step) specifies a 15 mm bore with a 5 mm key. For all other variants, please contact us with your module and tooth count to confirm bore and keyway specs before ordering.
Carbon steel worm gears are well-suited for moderate continuous-duty applications such as conveyor drives, actuators, and machine tool auxiliaries. For high-cycle or high-temperature environments, consider whether additional lubrication or a hardened-steel or bronze wheel variant would better suit your duty cycle.
Divide your input speed (RPM) by your desired output speed to get the required ratio. For a single-start worm, that ratio equals the worm wheel tooth count. For example, to reduce 1,400 RPM to 35 RPM, you need a 40:1 ratio — select the 40T worm wheel variant in your required module size.
