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When your motion control project demands a compact, self-locking gear reduction that fits tight spaces, a mismatched or imprecise worm gear set becomes a costly bottleneck. Engineers, robotics builders, and CNC hobbyists who need reliable 1:20 torque multiplication in a small footprint will find this 1 Modulus worm gear and worm rod shaft set purpose-built for the task.
This set pairs a 20-tooth worm wheel gear with a matching worm rod shaft, available in brass (worm gear) or 45# steel (worm rod). Bore diameters range from 6 mm to 15 mm (approx. 0.24"–0.59"), with worm rod outer diameters spanning Ø18 mm to Ø28 mm (approx. 0.71"–1.10"). Module is 1 (Mod 1), gear ratio is 1:20, and the worm rod is offered in A-type (straight shaft end) and B-type (extended shaft end) configurations.
Typical use cases include DIY robotic arm joints requiring self-locking worm drive reduction, CNC rotary axis builds using a 1 mod worm gear set for precise angular positioning, and compact automation actuators where a brass worm wheel gear paired with a 45# steel worm shaft delivers durable, low-backlash torque transfer.
Brass worm wheel with 20 teeth, Module 1 pitch, engineered for smooth meshing with the matching Mod 1 worm rod. Bore options: 6 mm, 6.35 mm, 8 mm, 10 mm (plain bore or keyway).
A-Type features a standard straight shaft end; B-Type offers an extended shaft end for additional coupling flexibility. Both are machined from 45# steel for strength and wear resistance.
Bore diameters from 6 mm to 15 mm; worm rod outer diameters from Ø18 mm to Ø28 mm. Keyway options (3×1.4 mm and 4×1.8 mm and 5×2.3 mm) available on select bore sizes for positive shaft locking.
The 1:20 worm drive ratio delivers significant torque multiplication and inherent self-locking behavior, preventing back-driving under load — ideal for positioning and holding applications.
Brass worm wheel provides corrosion resistance and quiet operation; 45# steel worm rod delivers hardness and durability. This material pairing is a proven standard for long-service worm drive assemblies.
Available in 1, 2, 3, 5, or 10 piece quantities per order. Stock up for prototyping runs or production builds without overpaying for single-piece pricing.
| Module (Mod) | 1 |
|---|---|
| Gear Ratio | 1:20 |
| Worm Gear Teeth | 20 |
| Worm Gear Material | Brass |
| Worm Rod Material | 45# Steel |
| Worm Gear Bore Diameter | 6 mm / 6.35 mm / 8 mm / 10 mm (see variant options) |
| Worm Rod Bore Diameter | 6 mm – 15 mm (see variant options) |
| Worm Rod Outer Diameter (Ø) | Ø18 mm / Ø22 mm / Ø26 mm / Ø28 mm (see variant options) |
| Worm Rod Type | A-Type (straight end) / B-Type (extended end) |
| Keyway Options | 3×1.4 mm / 4×1.8 mm / 5×2.3 mm (select variants) |
| Quantity per Order | 1 / 2 / 3 / 5 / 10 PCS (see variant options) |
| Surface Finish | See variant options |
Measure your motor or drive shaft diameter precisely with calipers. Select the bore option that matches your shaft diameter exactly. For shafts requiring a positive lock, choose a variant with a keyway (e.g., 8 mm/3×1.4 mm keyway) and use a matching key stock. If your shaft is imperial (e.g., 1/4"), the 6.35 mm bore variant is designed for that size.
A-Type worm rods have a standard straight shaft end on both sides of the worm thread section. B-Type worm rods feature an extended shaft end, providing more length for coupling, bearing support, or additional mechanical attachment. Choose B-Type when your assembly requires extra shaft engagement beyond the worm thread zone.
No. A 1:20 ratio Mod 1 worm drive is inherently self-locking under typical load conditions, meaning the output (worm gear) cannot back-drive the input (worm rod) when the drive is stationary. This makes it suitable for holding positions in robotic arms, camera pan-tilt heads, and similar applications without requiring a brake.
Yes. Brass offers good corrosion resistance in most indoor and light-industrial environments. It is not recommended for prolonged exposure to saltwater or highly acidic environments without additional protective coating. For outdoor or harsh-environment use, consider applying a light machine oil to the gear mesh contact surfaces.
The worm gear (wheel) and worm rod (shaft) must be used as a matched Mod 1 pair to mesh correctly. Using a Mod 1 worm gear with a different module worm rod will result in incorrect tooth engagement and premature wear. If you only need the worm gear or worm rod individually, select the corresponding single-component variant from the Types option.
These Mod 1 worm gear sets are well-suited for robotics joints, CNC rotary axes, DIY automation actuators, camera pan-tilt mechanisms, conveyor drives, and any application requiring compact torque multiplication with self-locking behavior. The 1:20 ratio is a common choice for servo-driven positioning systems where holding torque is important.
The outer diameter (Ø) of the worm rod determines the physical size of the worm shaft body. Select based on the bearing bore or housing bore in your assembly. Common options are Ø18 mm, Ø22 mm, Ø26 mm, and Ø28 mm. Larger outer diameters provide greater shaft rigidity and are recommended for higher-torque or longer-span applications.
