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When a motion-control project demands a reliable right-angle speed reduction without backlash headaches, engineers and makers alike reach for a matched worm gear set. These worm wheel gears and worm rods are designed for DIY builders, robotics enthusiasts, and light industrial integrators who need compact, self-locking drive solutions that fit standard shaft bores without custom machining.
The set covers two modulus standards — 1M and 1.5M — with worm wheel tooth counts ranging from 15T to 60T and bore diameters from 5 mm (0.20 in) up to 20 mm (0.79 in), including keyway variants (4 mm and 5 mm/6 mm keys). Worm wheels are cast in brass for smooth, low-friction meshing; mating worm rods (B-Type and C-Type) are machined from stainless steel for corrosion resistance and long service life. Overall gear outer diameters typically range from approximately 20 mm to 75 mm (0.79 in – 2.95 in) depending on tooth count and modulus.
Typical use cases include DIY linear actuator worm drive builds, low-speed high-torque robotics joint reduction, automated window opener worm gear mechanisms, and small CNC rotary axis worm wheel assemblies. The self-locking characteristic of worm drives makes these gears well-suited for any application where the load must hold position when the motor is de-energised.
Brass worm wheels paired with stainless steel worm rods deliver low-friction meshing and corrosion-resistant service life in damp or outdoor-adjacent environments.
Available in 1M and 1.5M modulus with tooth counts from 15T to 60T, covering a broad ratio range for speed reduction applications from light robotics to small industrial drives.
Bore diameters from 5 mm to 20 mm, including plain bore and keyway variants (4 mm, 5 mm, 6 mm keys), for direct shaft mounting without additional adapters.
The worm gear geometry provides inherent self-locking under typical lead angles, holding load position when the drive motor is off — ideal for lifts, gates, and positioning stages.
Order as single pieces for prototyping or in packs of 3, 5, or 10 for production runs and spares inventory — all variants ship as matched sets within the selected type.
Both B-Type (standard thread form) and C-Type (modified profile) worm rods are available in 1M and 1.5M modulus to match different wheel geometries and load requirements.
| Product Type | Worm Wheel Gear / Worm Rod (B-Type & C-Type) |
|---|---|
| Modulus | 1M, 1.5M |
| Tooth Count (Worm Wheel) | 15T, 20T, 25T, 30T, 35T, 40T, 50T, 60T |
| Bore Diameter | 5 mm / 6 mm / 8 mm / 10 mm / 12 mm / 14 mm / 15 mm / 16 mm / 18 mm / 20 mm (plain & keyway) |
| Keyway Options | 4 mm key (12 mm bore), 5 mm key (14–16 mm bore), 6 mm key (18–20 mm bore) |
| Worm Wheel Material | Brass |
| Worm Rod Material | Stainless Steel |
| Outer Diameter (approx.) | See variant options |
| Face Width | See variant options |
| Pressure Angle | 20° |
| Drive Type | Right-angle worm drive |
| Packing Quantity | 1 Pcs / 3 Pcs / 5 Pcs / 10 Pcs (see variant options) |
Modulus determines the tooth size and centre distance between the worm rod and worm wheel. You must use a matching modulus pair — a 1M worm rod only meshes correctly with a 1M worm wheel. Choose 1.5M when you need higher torque capacity or a larger gear body for a bigger bore shaft. If you are replacing an existing gear, measure the tooth pitch or check the original part number to confirm the modulus before ordering.
Select the bore diameter that matches your shaft's outer diameter exactly. For shafts requiring a keyway, choose the corresponding keyway variant (e.g., 12 mm + keyway 4 mm for a 12 mm shaft with a 4 mm key slot). Plain bore variants are suitable for press-fit or set-screw retention. If your shaft is between listed sizes, contact us to confirm the closest available option.
Yes, under typical operating conditions. Worm drives with a low lead angle (generally below ~5°) are self-locking, meaning the load cannot back-drive the worm rod. This makes them suitable for lifts, gates, and positioning stages where the load must hold when the motor is off. However, self-locking is not guaranteed under vibration or shock loads — always add a mechanical brake for safety-critical applications.
The worm rods are machined from stainless steel, offering good resistance to moisture and mild chemical exposure. The brass worm wheels are naturally corrosion-resistant in most indoor and sheltered outdoor environments. For harsh or submerged environments, apply a compatible gear lubricant and consider additional sealing of the housing.
No. Modulus must match between the worm wheel and worm rod for correct tooth engagement. Mixing moduli will result in improper meshing, accelerated wear, and potential gear failure. Always order a matched pair — select the same modulus for both the worm wheel and the worm rod.
B-Type worm rods use a standard thread profile and are the most common choice for general-purpose worm drives. C-Type worm rods feature a modified tooth profile that can offer improved contact ratio and load distribution in certain applications. Check your worm wheel specification or existing assembly to confirm which rod type is compatible before ordering.
The gear ratio of a worm drive equals the number of teeth on the worm wheel divided by the number of starts on the worm rod. For a single-start worm rod (most common), a 30T worm wheel gives a 30:1 ratio. A 60T wheel gives 60:1. Higher ratios provide greater torque multiplication and stronger self-locking but lower output speed. Select the tooth count that delivers the output speed and torque your application requires.
