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When your motion-control build demands repeatable torque transfer and zero-backlash engagement, mismatched or undersized worm drive components become the weakest link. Engineers, robotics builders, and industrial maintenance teams who need a reliable, drop-in worm gear set will find this module 1.5 pairing engineered to perform across continuous-duty cycles.
This listing covers two component families sold individually: C45 carbon steel worm shafts available in Type B, Type C, and Type L configurations, and brass worm gear wheels in 20, 25, 30, and 40 tooth counts. Bore diameters range from 8 mm (0.31 in) to 20 mm (0.79 in), with keyed options from 12 mm upward to suit standard shaft-key fits. All components are machined to Module 1.5 (m = 1.5) geometry for direct interchangeability within the same module family.
Typical applications include low-speed, high-torque conveyor drives, rotary indexing tables, CNC router axis drives, robotic joint actuators, and DIY automation rigs where a compact right-angle drive with inherent self-locking characteristics is required.
| Module | 1.5 (m = 1.5) |
|---|---|
| Worm Shaft Material | C45 Carbon Steel |
| Worm Shaft Types | Type B, Type C, Type L |
| Worm Gear Wheel Material | Brass |
| Tooth Count Options | 20T / 25T / 30T / 40T |
| Bore Diameter Range | 8 mm – 20 mm (0.31 in – 0.79 in) |
| Keyway | 4 mm (12 mm bore) / 5 mm (14–16 mm bore) / 6 mm (18–20 mm bore) |
| Pitch Diameter (reference) | ≈ 0.666 in (16.9 mm) |
| Pressure Angle | See variant options |
| Lead Angle | See variant options |
| Surface Finish | See variant options |
| Quantity per Order | 1 pc (sold individually) |
The gear ratio of a worm drive equals the number of teeth on the worm gear wheel divided by the number of starts on the worm shaft. For a single-start worm shaft, a 20-tooth wheel gives a 20:1 ratio, a 25-tooth gives 25:1, a 30-tooth gives 30:1, and a 40-tooth gives 40:1. Choose a higher tooth count when you need greater torque multiplication and lower output speed. For lighter loads or faster output, a lower tooth count is appropriate.
No — each component is sold individually (1 pc per order). You will need to add both a worm shaft and a worm gear wheel to your cart separately. All items in this listing share the same Module 1.5 specification, so any shaft type (B, C, or L) is geometrically compatible with any of the brass worm gear wheels listed here.
Match the bore diameter to your motor or drive shaft outer diameter. For shafts 12 mm and above, keyed bore options are available — the keyway width is 4 mm for 12 mm bores, 5 mm for 14–16 mm bores, and 6 mm for 18–20 mm bores. If your shaft is 8 mm or 10 mm, select the plain bore option. Always verify your shaft diameter with calipers before ordering.
Pairing a harder steel worm with a softer brass wheel is a deliberate engineering choice. Brass has natural lubricity that reduces friction and heat generation during meshing. It also allows the softer wheel to wear preferentially, protecting the more expensive or harder-to-replace worm shaft. This material combination is standard practice in worm drive design for moderate-load, continuous-duty applications.
Module 1.5 single-start worm drives typically exhibit self-locking behavior due to the low lead angle, meaning the output shaft cannot back-drive the input under static load. This is useful for holding a position without a separate brake. However, self-locking is not guaranteed under all dynamic or vibration conditions — for safety-critical holding applications, always use a dedicated mechanical brake in addition to the worm drive.
For steel-on-brass worm drives, a gear oil with EP (extreme pressure) additives or a dedicated worm gear oil (ISO VG 220 or 320 grade) is recommended. Avoid greases with incompatible additives that can attack brass. Ensure the gear housing retains adequate lubricant at the mesh point, especially for vertical-shaft orientations where oil may drain away from the contact zone.
Yes. These are bare components intended for integration into your own housing or gearbox design. You will need to design or source appropriate bearing supports for both the worm shaft and the wheel shaft, maintain correct center distance based on the module 1.5 geometry, and provide adequate lubrication. Contact us to confirm exact dimensional drawings if you need them for housing design.
