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When a project demands a compact, high-ratio speed reduction in a tight space, finding the right worm gear set can be the difference between a smooth-running mechanism and a frustrating rebuild. Whether you are a robotics hobbyist, a machine builder, or a maintenance engineer replacing worn drive components, this worm gear set gives you the exact modular pairing you need without sourcing worm and wheel separately.
Each listing covers a matched worm gear set available in four module sizes — 0.5M, 0.8M, 1M, and 1.5M — with tooth counts ranging from 15T to 60T on the gear wheel and corresponding worm shafts in A, B, C, and L profile types. Gear wheels are available in brass for smooth, low-noise operation, while worm shafts are offered in 45# carbon steel or stainless steel. Bore diameters span 4 mm (≈0.16 in) to 20 mm (≈0.79 in), with keyway options on larger bores for positive shaft locking.
Typical use cases include DIY motorized camera sliders requiring precise angular positioning, small conveyor or indexing table drives where a worm gear set provides inherent back-drive prevention, and replacement transmission parts in light industrial equipment such as gate openers, valve actuators, and rotary positioners.
Available in 0.5M, 0.8M, 1M, and 1.5M to suit miniature mechanisms through medium-duty drives. Module determines tooth pitch — match worm and wheel to the same module for correct meshing.
Bore diameters from 4 mm to 20 mm (≈0.16–0.79 in). Larger bores (12 mm and above) are available with precision-cut keyways (4 mm or 5 mm or 6 mm key slots) for positive, slip-free shaft engagement.
Brass gear wheels for quiet, low-friction operation; 45# carbon steel worm shafts for strength and wear resistance; stainless steel variants for corrosion-sensitive environments such as food processing or outdoor installations.
A-type, B-type, C-type, and L-type worm shaft profiles to match different housing and bearing arrangements. Choose the profile that fits your gearbox or custom housing design.
Worm gear sets with lead angles below the friction angle provide inherent back-drive prevention — the load cannot back-drive the worm. Useful in lifting, positioning, and valve applications where holding position under load is required.
Each variant is sold as a Pack of 1 unit (worm gear wheel or worm shaft as selected). Mix and match tooth counts and bore sizes across the same module to build your exact drive ratio.
| Product Type | Worm Gear Set (Worm Wheel + Worm Shaft) |
|---|---|
| Available Modules | 0.5M, 0.8M, 1M, 1.5M |
| Gear Wheel Tooth Counts | 15T, 20T, 25T, 30T, 35T, 40T, 50T, 60T (varies by module) |
| Worm Shaft Types | A type, B type, C type, L type |
| Gear Wheel Material | Brass |
| Worm Shaft Material | 45# Carbon Steel / Stainless Steel (see variant options) |
| Bore Diameter Range | 4 mm – 20 mm (≈0.16 – 0.79 in) |
| Keyway Availability | Available on 12 mm+ bores (4 mm, 5 mm, or 6 mm key slot) |
| Outer Diameter (Gear Wheel) | See variant options |
| Face Width | See variant options |
| Pressure Angle | 20° (standard) |
| Quantity per Pack | 1 piece |
| Surface Finish | See variant options |
The module (M) defines the tooth size and pitch. Larger modules handle higher torque but result in a larger gear diameter. For miniature mechanisms or light loads, 0.5M or 0.8M is typical. For moderate torque in robotics or small machinery, 1M is a common choice. For heavier-duty drives, 1.5M provides greater tooth strength. The worm and gear wheel must always share the same module to mesh correctly.
The tooth count on the gear wheel directly determines the gear ratio when paired with a single-start worm. For example, a 1M 30T gear wheel paired with a single-start worm gives a 30:1 reduction ratio. Higher tooth counts mean higher reduction ratios and more torque multiplication, but lower output speed. Choose based on your required output RPM and torque.
Brass gear wheels are the standard choice for worm drives because brass is softer than steel, which reduces wear on the worm shaft and runs quietly. 45# carbon steel worm shafts offer good strength and hardness for the driving member. Stainless steel variants are recommended for environments with moisture, humidity, or mild chemical exposure where corrosion resistance is needed, such as outdoor installations or food-adjacent equipment.
A keyway bore is recommended when the gear must transmit significant torque without slipping on the shaft. Plain bores rely on a set screw or interference fit, which can slip under high or reversing loads. Keyway options are available on 12 mm bores (4 mm key), 14–16 mm bores (5 mm key), and 18–20 mm bores (6 mm key). Match the key size to your shaft's existing keyway, or machine a matching keyway into your shaft.
Self-locking behavior depends on the lead angle and friction coefficient. Worm gear sets with low lead angles (typically single-start worms with high tooth counts) are inherently self-locking — the output load cannot back-drive the input worm. This is useful for lifting, positioning, and valve applications. However, self-locking also means the drive is not back-drivable, so it cannot be used as a generator or regenerative brake. If back-driveability is needed, select a multi-start worm or a lower reduction ratio.
Yes, provided the module, tooth count, bore diameter, and shaft profile match your existing components. Measure the outer diameter and face width of your current gear wheel, confirm the module by counting teeth and measuring pitch diameter (pitch diameter = module × tooth count), and verify the bore and keyway dimensions. If you are unsure, contact us with your measurements and we can help confirm compatibility.
The shaft profile type refers to the overall shape and length of the worm shaft, which affects how it mounts in a housing or between bearings. A-type and B-type are the most common standard profiles. C-type typically features a different shaft extension or flange arrangement. L-type (long type) has an extended shaft for applications requiring more bearing span or a longer engagement length. Refer to your housing drawings or existing shaft dimensions to select the correct profile.
