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When your motion-control build demands a compact, high-ratio drive that won't slip under load, a mismatched or low-tolerance worm gear set becomes the weakest link in the chain. Engineers, robotics builders, and CNC hobbyists who need reliable torque multiplication in a small footprint rely on a properly matched worm wheel and worm rod pair — and that's exactly what this 1 Modulus set delivers.
This listing covers a complete 1 Mod (Module 1, pitch 3.14 mm / 0.124 in) worm drive system offered in two material options and multiple bore sizes. The worm wheel features 24 teeth machined from brass, with bore diameters ranging from 6 mm to 10 mm (0.24–0.39 in), including keyway variants. The worm rods are available in A-Type and B-Type profiles, machined from 45# medium-carbon steel, with shaft diameters from 6 mm to 15 mm (0.24–0.59 in) and outer body diameters of 18 mm, 22 mm, 26 mm, or 28 mm (0.71–1.10 in). Quantity options range from 1 to 10 pieces per order.
Typical use cases include low-speed, high-torque actuators in desktop CNC routers, pan-tilt camera rigs, conveyor indexing mechanisms, and DIY robotic arm joints where a self-locking worm drive prevents back-driving. The 1 Mod standard also makes these gears interchangeable with other Module-1 components in multi-stage gearbox designs for maker and automation projects.
The worm wheel is cut from brass, offering good machinability, low friction against steel, and natural corrosion resistance for indoor mechanical environments. 24-tooth count gives a 24:1 reduction ratio with a single-start worm.
Worm rods are turned from 45# medium-carbon steel for strength and wear resistance. A-Type and B-Type profiles differ in thread lead and body geometry — select the type that matches your gearbox housing design.
Bore sizes from 6 mm to 15 mm accommodate a wide range of motor and shaft diameters. Keyway variants (3×1.4 mm and 4×1.8 mm and 5×2.3 mm) are available for positive torque transmission without set-screw slip.
The low lead angle of a 1 Mod single-start worm provides inherent self-locking behavior, preventing back-driving under static load — ideal for positioning stages and lifting mechanisms that must hold position without a brake.
Order from 1 to 10 pieces per variant to match prototype or small-batch production needs. Multi-piece packs offer a per-unit cost advantage for builds requiring multiple identical drive stages.
All components conform to the Module 1 gear standard (pitch 3.14 mm), ensuring dimensional compatibility with other M1 worm gears, housings, and shafts from any manufacturer following the same standard.
| Module (Mod) | 1 |
|---|---|
| Pitch | 3.14 mm (0.124 in) |
| Worm Wheel Teeth | 24 |
| Reduction Ratio (single-start) | 24:1 |
| Worm Wheel Material | Brass |
| Worm Rod Material | 45# Medium-Carbon Steel |
| Worm Rod Types | A-Type, B-Type |
| Worm Wheel Bore Diameter | 6 mm / 8 mm / 10 mm (with plain or keyway options) |
| Worm Rod Shaft Diameter | 6 – 15 mm (see variant options) |
| Worm Rod Outer Diameter (Ø) | 18 mm / 22 mm / 26 mm / 28 mm (see variant options) |
| Keyway Options | 3×1.4 mm / 4×1.8 mm / 5×2.3 mm (see variant options) |
| Available Quantities | 1 / 2 / 3 / 5 / 10 PCS |
| Pressure Angle | See variant options |
| Surface Finish | See variant options |
A-Type and B-Type worm rods differ in their thread profile and body geometry. A-Type rods are typically used in standard enclosed gearbox housings, while B-Type rods suit applications where the rod extends through a bearing on both ends. Check your gearbox housing drawing or the mating housing specification to confirm which profile fits your design before ordering.
With a 24-tooth worm wheel and a single-start worm rod, the reduction ratio is 24:1. This means the output shaft completes one full revolution for every 24 revolutions of the input worm. This high ratio is well-suited for slow, high-torque applications such as robotic joints and positioning stages.
Yes. The low lead angle of a Module 1 single-start worm typically produces a self-locking condition, meaning the output load cannot back-drive the worm. This makes the set suitable for lifting mechanisms, camera pan-tilt heads, and positioning stages that must hold position when the motor is de-energized. Note that self-locking behavior depends on friction conditions and lubrication — verify under your specific load and lubrication conditions.
Brass offers good natural corrosion resistance in typical indoor environments and is not prone to rust. It is suitable for dry or lightly lubricated applications. For outdoor or high-humidity environments, additional protective measures such as grease lubrication or a sealed housing are recommended to extend service life.
Measure your motor or drive shaft diameter precisely with a caliper. Select the bore option that matches your shaft diameter. If your shaft has a keyway cut, choose the matching keyway variant (3×1.4 mm for smaller shafts, 4×1.8 mm or 5×2.3 mm for larger shafts) to ensure positive torque transmission. Plain bore variants rely on a set screw or interference fit and are suitable for lighter-duty or prototype applications.
Yes, as long as the mating worm rod conforms to the Module 1 standard (pitch 3.14 mm) and the same pressure angle. Module 1 is an internationally recognized gear standard, so components from different manufacturers should be dimensionally compatible. Always verify the pressure angle and thread start count match before mixing components from different sources.
For prototyping or a single build, the 1 PCS option lets you validate fit and function before committing to larger quantities. For small production runs or builds with multiple identical drive stages, the 5 PCS or 10 PCS packs offer a lower per-unit cost. Select the quantity that matches your immediate build requirement to avoid unnecessary inventory.
