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When your project demands a compact, high-ratio speed reduction in a tight space, standard spur gears fall short. Engineers, makers, and hobbyists working on robotic arms, motorized camera sliders, conveyor drives, and CNC axis locks need a worm gear set that meshes cleanly, holds position under load, and fits a standard motor shaft without custom machining. This listing covers a complete family of 0.5 module and 0.8 module worm gear sets — pairing worm gear wheels with matching worm rods in multiple tooth counts, bore sizes, and materials.
Each set consists of a worm gear wheel (20T to 60T) and a corresponding worm rod (A-type, B-type, or L-type), machined to 0.5 Mod or 0.8 Mod pitch. Worm gear wheels are available in brass; worm rods are available in 45# carbon steel or stainless steel. Bore diameters range from 4 mm (approx. 0.157 in) to 12 mm (approx. 0.472 in), with a Without Hole option on L-type rods. Outer diameter of the gear wheel scales with tooth count — typically 14–40 mm (approx. 0.55–1.57 in) across the range.
Typical use cases include: low-speed, high-torque actuators for robotic joints and pan-tilt camera rigs; self-locking drive stages for motorized blinds, valve actuators, and lifting mechanisms where back-driving must be prevented; and compact gearbox builds for 3D-printed enclosures, RC vehicles, and educational automation kits requiring a small-module worm gear wheel with a precise bore fit.
Available in 0.5 Mod and 0.8 Mod to suit fine-pitch compact drives or heavier-duty torque applications. Select the module that matches your worm rod for correct mesh.
Worm gear wheels offered in 20T, 25T, 30T, 35T, 40T, 50T, and 60T. Higher tooth counts deliver greater gear ratios and smoother, quieter operation at low output speeds.
Brass worm gear wheels offer low friction and corrosion resistance for indoor mechanisms. 45# carbon steel and stainless steel worm rods provide the hardness needed to drive the softer gear without rapid wear.
Bore options of 4 mm, 5 mm, 6 mm, 8 mm, 10 mm, and 12 mm cover the most common DC motor and stepper motor shaft diameters. L-type rods also available without a bore hole for custom machining.
A-type (straight shaft), B-type (stepped shaft), and L-type (extended shaft) worm rods let you choose the mounting geometry that fits your gearbox housing or motor coupling arrangement.
The single-start worm thread geometry provides inherent self-locking when the lead angle is low, preventing back-driving under static load — ideal for lifting stages, valve actuators, and positioning systems.
| Module | 0.5 Mod / 0.8 Mod (select variant) |
|---|---|
| Gear Type | Worm Gear Wheel + Worm Rod (matched pair) |
| Tooth Count (Gear Wheel) | 20T / 25T / 30T / 35T / 40T / 50T / 60T |
| Worm Rod Profile | A-type / B-type / L-type (select variant) |
| Gear Wheel Material | Brass |
| Worm Rod Material | 45# Carbon Steel / Stainless Steel (select variant) |
| Bore Diameter | 4 mm / 5 mm / 6 mm / 8 mm / 10 mm / 12 mm / Without Hole |
| Gear Wheel OD (approx.) | See variant options |
| Worm Rod Length (approx.) | See variant options |
| Pressure Angle | 20 degrees |
| Quantity per Order | 1 Pc (gear wheel or worm rod, as selected) |
| Surface Finish | Machined; brass natural finish / steel natural or passivated |
Module (Mod) defines the tooth size and pitch. 0.5 Mod gears are smaller and suited for compact, low-torque drives such as camera sliders or small robotic joints. 0.8 Mod gears have larger teeth, handle more torque, and are better for heavier mechanisms like motorized blinds or conveyor stages. You must match the module of the worm gear wheel to the worm rod — mixing modules will result in no mesh.
For a single-start worm rod, the gear ratio equals the number of teeth on the worm gear wheel. A 20T wheel gives a 20:1 ratio; a 60T wheel gives a 60:1 ratio. This means one full rotation of the worm rod produces 1/20 or 1/60 of a rotation at the gear wheel output — delivering significant torque multiplication in a compact package.
Single-start worm gears with a low lead angle (typical of 0.5 Mod and 0.8 Mod small-module sets) are generally self-locking, meaning the output shaft cannot back-drive the input. This makes them suitable for lifting mechanisms, valve actuators, and positioning stages where the load must hold position when the motor is off. Self-locking behavior depends on friction conditions — lubrication and load magnitude affect the threshold.
Measure your motor shaft outer diameter with calipers. Select the bore that matches exactly — available in 4 mm, 5 mm, 6 mm, 8 mm, 10 mm, and 12 mm. A bore that is too large will require a set screw or adhesive to secure; a bore that is too small cannot be fitted without machining. If you need a custom bore, choose the Without Hole L-type worm rod and machine to your required diameter.
A-type worm rods have a uniform straight shaft on both ends, suitable for standard bearing housings. B-type rods feature a stepped shaft (one end is reduced in diameter) for easier coupling to motor shafts or for use with specific gearbox housings. L-type rods have an extended shaft length and are available without a bore hole, intended for applications where the rod is mounted through a custom housing or where the shaft end needs to be machined to a specific diameter or keyway.
Yes — this is the recommended pairing. The softer brass gear wheel meshes against the harder steel worm rod, which reduces wear on the rod and concentrates any wear on the more easily replaced gear wheel. This material combination also reduces friction compared to steel-on-steel, improving efficiency and reducing heat generation in continuous-duty applications.
Brass worm gear wheels offer good corrosion resistance for indoor and mildly humid environments. Stainless steel worm rods provide better corrosion resistance than 45# carbon steel rods. For outdoor or wet environments, select stainless steel rods and consider applying a light grease to the mesh contact area. 45# carbon steel rods are best suited for dry indoor applications where cost is a priority.
Yes — each variant in this listing is sold as 1 piece (either a worm gear wheel or a worm rod). To build a complete worm drive, select and purchase one matching worm gear wheel and one worm rod of the same module (0.5 Mod with 0.5 Mod, or 0.8 Mod with 0.8 Mod). Use the Types option to select your component, and the Bore option to match your shaft diameter.
