Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When your project demands precise, self-locking power transmission and you can't afford slop or backlash, finding a matched worm gear set in the right bore size is frustrating. This module 0.8 worm gear wheel and worm shaft set is designed for hobbyists, robotics builders, and mechanical engineers who need a dependable, compact drive solution that fits standard shaft sizes right out of the box.
The set includes POM plastic worm gear wheels (20, 25, 30, 35, 40, 50, or 60 tooth) and stainless steel worm shafts (Type A, Type B, or Type L). POM acetal wheels measure approximately 25–75mm (~1.0–3.0 in) in outer diameter depending on tooth count, with bore sizes ranging from 5mm to 12mm (~0.20–0.47 in). The stainless steel shafts offer corrosion resistance and dimensional stability across a wide range of operating conditions.
Typical use cases include DIY robotic arm joints requiring self-locking worm drive mechanisms, compact conveyor or indexing table builds using a module 0.8 worm gear reduction, and 3D printer or CNC axis drives where a low-backlash worm gear set for 5mm–12mm shafts is needed for repeatable positioning.
Worm gear wheels are machined from POM (polyoxymethylene) acetal plastic — a self-lubricating engineering polymer with low friction, good dimensional stability, and resistance to wear under continuous meshing loads.
Type A, B, and L worm shafts are manufactured from stainless steel, providing corrosion resistance and the hardness needed to drive POM wheels efficiently without premature wear.
All components conform to the module 0.8 gear standard, ensuring correct meshing geometry between the worm shaft and wheel. Tooth counts from 20 to 60 allow selection of the gear ratio that suits your drive requirements.
Bore diameters of 5mm, 6mm, 8mm, 10mm, and 12mm cover the most common metric shaft sizes used in robotics, automation, and DIY mechanical builds — no custom machining required for standard shafts.
The worm gear configuration provides inherent self-locking behavior at typical lead angles, meaning the load cannot back-drive the worm shaft — useful for positioning systems, lifts, and actuators that must hold position without a brake.
Choose from 20, 25, 30, 35, 40, 50, or 60 tooth wheels to achieve the gear ratio your application needs. Higher tooth counts provide greater reduction and torque multiplication from the worm shaft input.
| Gear Type | Worm Gear (Worm Wheel + Worm Shaft) |
|---|---|
| Module | 0.8 |
| Worm Wheel Material | POM Acetal Plastic |
| Worm Shaft Material | Stainless Steel |
| Worm Shaft Types | Type A, Type B, Type L |
| Number of Teeth (Wheel) | 20 / 25 / 30 / 35 / 40 / 50 / 60 Tooth |
| Bore Diameter | 5mm / 6mm / 8mm / 10mm / 12mm (0.20–0.47 in) |
| Pitch Diameter (Wheel) | See variant options |
| Outer Diameter (Wheel) | See variant options |
| Shaft Diameter (Worm) | See variant options |
| Shaft Length (Worm) | See variant options |
| Pressure Angle | 20° |
| Drive Direction | Right-hand (standard) |
| Finish (Shaft) | Natural stainless steel |
| Finish (Wheel) | Natural POM (white/off-white) |
| Sold As | 1 piece per order (shaft or wheel — select model above) |
The gear ratio of a worm drive equals the number of teeth on the wheel divided by the number of starts on the worm shaft (typically 1 for single-start worms). A 20-tooth wheel gives a 20:1 ratio, while a 60-tooth wheel gives a 60:1 ratio. Choose a higher tooth count when you need more torque multiplication and slower output speed, and a lower tooth count when you need faster output with less reduction.
Select the bore size that matches your shaft diameter. Available bores are 5mm, 6mm, 8mm, 10mm, and 12mm. For a secure fit, the bore should match the shaft exactly — use a set screw or keyway to lock the component in place. If your shaft is imperial, convert to metric and select the nearest bore size, then verify the fit before final assembly.
Yes, at typical module 0.8 lead angles, the worm gear geometry provides self-locking behavior — meaning the output (wheel) side cannot back-drive the input (worm shaft) side under static load. This is useful for lifts, positioning stages, and actuators that must hold position without a powered brake. Note that self-locking is not guaranteed under vibration or shock loads; always verify for your specific application.
Yes — the worm shaft and worm gear wheel in this listing are designed as a matched module 0.8 pair. The stainless steel worm shaft meshes correctly with the POM acetal wheel. The dissimilar material pairing (steel worm driving plastic wheel) is a standard engineering practice that reduces friction and wear on the softer wheel while the harder shaft maintains its geometry over time.
The worm shafts are made from stainless steel, which offers good resistance to moisture, mild chemicals, and oxidation in typical indoor and light outdoor environments. The POM acetal wheels are inherently resistant to moisture absorption and many common solvents. For harsh chemical or saltwater environments, verify compatibility with your specific media before use.
Type A, B, and L refer to different shaft configurations — typically differing in overall shaft length, shoulder geometry, or end treatment (e.g., plain end, threaded end, or extended shaft). Select the type that matches your mounting arrangement and coupling method. If you are unsure which type suits your build, contact us with your application details and we can advise.
These module 0.8 worm gear sets are well-suited for robotics joints, small conveyor drives, indexing tables, camera pan/tilt mechanisms, 3D printer axis drives, CNC rotary axes, and general DIY automation projects requiring compact, self-locking gear reduction. They are not intended for high-speed, high-temperature, or heavy industrial continuous-duty applications.
