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When your motion-control build demands a compact, high-ratio drive solution, sourcing a matched worm gear set that fits standard motor shafts without custom machining is a real challenge. Engineers, robotics hobbyists, and small-batch manufacturers who need reliable torque transmission in a tight footprint will find this Module 0.5 worm gear wheel and shaft set a direct answer to that problem.
This set consists of C45 carbon steel worm wheels (20, 25, 30, 35, 40, 50, or 60 tooth) and a matching Type B worm shaft, all machined to Module 0.5 standards. The worm wheel pitch diameter is 2.000 in (50.8 mm), with bore options of 4 mm (~0.157 in), 5 mm (~0.197 in), and 6 mm (~0.236 in) to suit a range of motor and shaft diameters. Tooth count options span 20–60T, giving gear ratios from 20:1 to 60:1 in a single product family.
Typical use cases include DIY CNC axis drives requiring a self-locking worm stage, small robotic arm joints where a compact 90° drive change is needed, and light industrial conveyor or indexing mechanisms where a module 0.5 worm gear set for stepper motors provides precise positioning without backlash-prone spur stages.
Machined from C45 medium-carbon steel for a balance of hardness, machinability, and wear resistance suited to light-to-medium duty worm drive applications.
Gear teeth are cut to Module 0.5 standards, ensuring accurate mesh with any Module 0.5 worm shaft and predictable gear ratios from 20:1 up to 60:1.
Three bore options cover the most common metric motor and drive shaft diameters, reducing the need for custom bushings or adapters in most builds.
The Type B worm shaft is designed to mesh directly with the worm wheels in this family, providing a complete 90° drive pair without compatibility guesswork.
Available in 1, 2, 3, 4, 5, or 10-piece packs, supporting single-prototype builds through small production runs with volume pricing built in.
Module 0.5 worm gear sets with high tooth counts (40T+) typically exhibit self-locking behavior, preventing back-driving — useful for positioning stages and lifting mechanisms.
| Gear Type | Worm Gear Wheel & Worm Shaft (Type B) |
|---|---|
| Module | 0.5 |
| Material | C45 Carbon Steel |
| Tooth Count (Wheel) | 20 / 25 / 30 / 35 / 40 / 50 / 60 Tooth (see variant options) |
| Bore Diameter | 4 mm / 5 mm / 6 mm (see variant options) |
| Pitch Diameter | 2.000 in (50.8 mm) |
| Gear Ratio Range | 20:1 – 60:1 (wheel-to-shaft) |
| Drive Angle | 90° |
| Surface Finish | See variant options |
| Pack Quantity | 1 / 2 / 3 / 4 / 5 / 10 pcs (see variant options) |
| Weight | See variant options |
The tooth count determines your gear ratio: a 20-tooth wheel paired with a single-start worm shaft gives a 20:1 ratio, a 60-tooth wheel gives 60:1. Choose a higher tooth count when you need more torque multiplication and slower output speed. For robotics joints or CNC axes, 30–40T is a common starting point. For very slow, high-torque indexing, 50–60T is typical.
NEMA 17 stepper motors typically have a 5 mm output shaft. Select the 5 mm bore variant for a direct fit. If you are using a NEMA 23 motor, the shaft is commonly 6.35 mm — in that case, the 6 mm bore with a light press-fit or a set-screw collar adapter may be needed. Always measure your shaft diameter before ordering.
C45 carbon steel offers a tensile strength of approximately 600–800 MPa in its normalized state, making it suitable for light-to-medium duty worm drive applications such as robotics, small conveyors, and DIY CNC machines. For heavy industrial loads or continuous high-speed operation, consider whether a hardened or alloy steel gear would be more appropriate for your specific torque and duty cycle.
C45 carbon steel is not inherently corrosion-resistant. For indoor, dry environments this is generally acceptable. If your application involves moisture, humidity, or mild chemical exposure, consider applying a light machine oil coating for storage and operation, or contact us to discuss alternative material options for your use case.
The worm wheel and worm shaft are designed as a matched Module 0.5 pair. The worm wheel will mesh with any Module 0.5 single-start worm shaft of compatible geometry. If you already have a Module 0.5 worm shaft from another source, you can order only the wheel variants. However, for guaranteed mesh quality and dimensional compatibility, ordering the matched Type B shaft from this listing is recommended.
Self-locking occurs when the lead angle of the worm is low enough that the output (wheel) cannot back-drive the input (shaft). For Module 0.5 single-start worm sets, self-locking behavior is typically present at higher tooth counts (40T and above). This is useful for lifting stages, positioning tables, and any mechanism where you want the load to hold position when the motor is unpowered. Note that self-locking also means the drive is not reversible from the wheel side.
For a single prototype or proof-of-concept build, the 1-piece or 2-piece pack is the most cost-effective starting point. For small production runs of 5–10 units, the 5-piece or 10-piece packs offer better per-unit pricing. The 10-piece pack is the best value for batch builds or when you want spare parts on hand for maintenance.
