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When your motion-control project demands a compact, high-ratio drive that fits in tight spaces, a mismatched or undersized worm gear set becomes the bottleneck that stalls everything. Engineers, robotics builders, and CNC hobbyists who need a reliable 1:22 reduction in a small footprint will find this 1 Module worm gear and worm rod set a direct, no-compromise solution.
The set pairs a 22-tooth worm wheel gear machined from brass with a mating worm rod available in 45# steel. Module (pitch) is 1 mm. Bore diameters range from 6 mm to 15 mm (approximately 0.24 in to 0.59 in); worm rod outer diameters span 18 mm to 28 mm (approximately 0.71 in to 1.10 in). Both A-type (straight-end) and B-type (stepped-end) worm rod profiles are offered to suit different shaft-retention methods.
Typical use cases include low-speed, high-torque actuators in desktop robotic arms, lead-screw-free Z-axis drives on compact CNC routers, and self-locking positioning stages where back-driving must be prevented. The 1:22 ratio also suits motorized camera sliders and automated valve actuators where precise angular control is required.
| Module (Pitch) | 1 mm |
|---|---|
| Gear Ratio | 1:22 |
| Number of Teeth (Worm Wheel) | 22 |
| Worm Wheel Material | Brass |
| Worm Rod Material | 45# Carbon Steel |
| Bore Diameter Range | 6 mm – 15 mm (0.24 in – 0.59 in) |
| Worm Rod Outer Diameter | 18 mm – 28 mm (0.71 in – 1.10 in) |
| Worm Rod Types | A-Type (plain end), B-Type (stepped end) |
| Keyway Options | 4×1.8 mm, 5×2.3 mm (select variants) |
| Pack Quantity Options | 1, 2, 3, 5, 10 PCS |
| Surface Finish | See variant options |
| Tooth Profile | See variant options |
The A-Type worm rod has a plain cylindrical shaft end, making it straightforward to secure with a set screw or shaft collar. The B-Type has a stepped shoulder that locates against a bearing face, which simplifies axial positioning in housings where the bearing inner race needs a positive stop. Choose A-Type for simple set-screw retention and B-Type when your housing design relies on a shoulder for axial location.
Measure your motor or input shaft diameter precisely with calipers. Select the bore that matches your shaft — available options include 6 mm, 8 mm, 10 mm, 12 mm, 14 mm, and 15 mm. For shafts requiring positive rotational locking, choose a keyway variant (4×1.8 mm or 5×2.3 mm) and cut a matching keyway in your shaft.
Worm gear sets with a low lead angle — typical of 1-module, single-start worms — are generally self-locking under static conditions, meaning the output shaft cannot back-drive the worm. However, self-locking behavior depends on the friction coefficient between the mating surfaces. Under vibration or dynamic loads, some back-driving may occur. For safety-critical applications, always add a mechanical brake or locking mechanism.
Brass offers good resistance to atmospheric corrosion and mild moisture. It is suitable for indoor environments and light-duty outdoor enclosures. For harsh environments with exposure to saltwater, strong acids, or prolonged high humidity, consider adding a protective coating or selecting a stainless-steel alternative if available.
Yes. NEMA 17 stepper motors typically have a 5 mm output shaft; select the 6 mm bore variant and use a 5-to-6 mm shaft adapter or a split-clamp hub. NEMA 23 motors commonly use 6.35 mm or 8 mm shafts — the 8 mm bore variant fits directly. Always verify the shaft diameter of your specific motor before ordering.
The brass-and-steel pairing is intentional: the softer brass wheel acts as the sacrificial wear component, protecting the harder steel worm rod. This is standard practice in worm drive design — when the gear set eventually wears, replacing the brass wheel is less costly than replacing the steel worm. Regular lubrication with a suitable gear grease extends the service life of both components significantly.
For a single prototype or proof-of-concept build, the 1 PCS option is the most economical. For small production runs of 5–10 units, the 5 PCS or 10 PCS packs offer a lower per-unit cost. The 2 PCS and 3 PCS packs are useful when you need spares on hand during development without committing to a full bulk quantity.
