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When your project demands a reliable right-angle speed reduction in a tight space, sourcing a matched worm gear set that fits your shaft and load requirements can be a real challenge. Whether you are building a motorized camera slider, a conveyor indexer, or a self-locking actuator, this 1 Modulus worm gear and shaft set gives hobbyists, robotics builders, and small-machine designers a ready-to-install drive pair without custom machining.
This listing covers a complete 1 Mod worm drive system in two component categories: worm gear wheels molded from engineering-grade blue nylon (PA), available in 15T, 20T, 25T, 30T, 35T, 40T, 50T, 60T, and 80T tooth counts; and matching worm shafts (rods) in A-type, B-type, and L-type configurations machined from either 45# carbon steel or stainless steel. Gear bore diameters range from 5 mm to 12 mm (approximately 0.20 in to 0.47 in); shaft bore options include 6 mm, 8 mm, and 10 mm (approximately 0.24 in to 0.39 in), with a holeless option also available for custom boring.
Typical use cases include low-speed high-torque drives in DIY CNC router axis feeds, worm-drive winches for model engineering, self-locking lift mechanisms in automated furniture, and right-angle gearbox assemblies for small robotics platforms. The nylon gear material reduces noise and eliminates the need for lubrication in light-duty cycles, making this set well-suited for indoor automation and maker projects where quiet operation matters.
Gear wheels available in 15T, 20T, 25T, 30T, 35T, 40T, 50T, 60T, and 80T — covering a broad range of reduction ratios in a single 1 Mod standard for flexible drive design.
Worm gear wheels are molded from PA (polyamide) nylon, offering low friction, self-lubricating properties, and reduced operating noise compared to all-metal alternatives in light-to-medium duty applications.
Choose A-type (standard straight), B-type (with shoulder step), or L-type (extended length) worm rods to match your housing and mounting configuration without additional machining.
Worm shafts are available in 45# carbon steel for cost-effective general use, or stainless steel for environments requiring improved corrosion resistance and surface hardness.
Gear bore options from 5 mm to 12 mm and shaft bore options from 6 mm to 10 mm (plus holeless) allow direct mounting to common motor and gearbox output shafts without adapters.
The worm drive geometry provides natural back-drive resistance at typical reduction ratios, making this set suitable for lift, positioning, and indexing applications where load holding without a brake is needed.
| Module | 1 (Mod 1) |
|---|---|
| Gear Tooth Count | 15T, 20T, 25T, 30T, 35T, 40T, 50T, 60T, 80T |
| Gear Material | Blue Nylon (PA / Polyamide) |
| Shaft Type | A-Type, B-Type, L-Type |
| Shaft Material | 45# Carbon Steel / Stainless Steel (see variant options) |
| Gear Bore Diameter | 5 mm, 6 mm, 8 mm, 10 mm, 12 mm (see variant options) |
| Shaft Bore Diameter | 6 mm, 8 mm, 10 mm, Holeless (see variant options) |
| Gear Outer Diameter | See variant options |
| Shaft Length | See variant options |
| Pressure Angle | 20° |
| Drive Angle | 90° |
| Quantity per Order | 1 PCS |
| Finish | Natural nylon (gear) / Machined bare metal (shaft) |
The tooth count of the worm gear wheel determines the gear reduction ratio when paired with a single-start worm shaft. For example, a 40T gear with a 1-start worm gives a 40:1 reduction. Choose a higher tooth count (e.g., 60T or 80T) for more torque and slower output speed, or a lower count (e.g., 15T or 20T) for faster output with less torque multiplication. Match the ratio to your motor RPM and required output speed.
Measure your motor or gearbox output shaft diameter precisely with calipers. Select the bore size that matches — available options are 5 mm, 6 mm, 8 mm, 10 mm, and 12 mm for gear wheels, and 6 mm, 8 mm, and 10 mm for worm shafts. If your shaft diameter falls between standard sizes, choose the holeless option and bore it to your exact specification. A loose bore fit will require a setscrew or keyway; a press fit is not recommended for nylon gears.
A-type worm shafts have a standard straight profile suitable for most open-frame or custom-housing installations. B-type shafts include a shoulder step that provides a positive axial stop against a bearing face, simplifying assembly in housings with thrust bearing pockets. L-type shafts are extended-length versions that allow more overhang or dual-side support in longer gearbox housings. Select the type that matches your housing design and bearing arrangement.
Engineering-grade PA nylon offers a tensile strength typically in the range of 70–85 MPa and is well-suited for light-to-medium duty drives — such as small conveyors, camera rigs, automated blinds, and hobby robotics. For continuous high-torque or high-temperature environments (above approximately 80–100 °C), a metal gear wheel would be more appropriate. If you are unsure whether nylon is sufficient for your load, contact us with your torque and duty cycle requirements.
Yes, worm drives with a low lead angle (typical of single-start, high-ratio configurations) exhibit natural back-drive resistance, meaning the output shaft cannot easily rotate the worm shaft in reverse. This is useful for lift and positioning applications. However, self-locking is not a substitute for a mechanical brake in safety-critical applications, as vibration or shock loads can overcome the locking effect over time. For critical holding applications, always add a dedicated brake or detent mechanism.
45# carbon steel shafts offer good machinability, adequate surface hardness after heat treatment, and are the cost-effective choice for indoor, dry environments. Stainless steel shafts provide improved corrosion resistance and are better suited for humid, washdown, or outdoor-adjacent environments where surface rust would be a concern. Both materials are compatible with the nylon gear wheel; the nylon gear acts as the sacrificial wear component in the pair, which is the intended design for easy maintenance.
One of the advantages of nylon gear wheels is their self-lubricating property in light-duty, low-speed applications — no grease is required for basic operation. For higher speeds or continuous-duty cycles, a light application of white lithium grease or PTFE-based lubricant on the worm thread contact surface can extend service life and reduce heat buildup. Avoid petroleum-based oils that may swell or degrade the nylon over time.
