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When a motion-control project demands a reliable right-angle speed reduction with minimal backlash, the wrong gear material can mean stripped teeth, excessive noise, and premature failure. Mechanical engineers, robotics builders, and workshop DIYers who need a dependable worm gear wheel that pairs cleanly with a 1.5-module worm shaft will find this brass wheel a practical, long-lasting solution.
This worm gear wheel is machined from brass, a material valued for its self-lubricating properties, corrosion resistance, and compatibility with steel worm shafts. Available in four tooth counts — 20T, 25T, 30T, and 40T — with an outer diameter ranging from approximately 33 mm (1.30 in) for the 20T up to approximately 63 mm (2.48 in) for the 40T. Bore options span 8 mm to 20 mm, with keyway configurations (4 mm or 5 mm/6 mm keyway) available on larger bore sizes for positive shaft engagement.
Typical use cases include DIY rotary table drives and indexing fixtures, compact conveyor and actuator assemblies requiring high reduction ratios, and robotics joint mechanisms where a 1.5M worm gear set provides the torque multiplication needed for servo-driven axes.
| Module | 1.5M |
|---|---|
| Material | Brass |
| Tooth Count Options | 20T / 25T / 30T / 40T |
| Bore Diameter Range | 8 mm – 20 mm (0.31 in – 0.79 in) |
| Keyway Options | 4 mm (12 mm bore) / 5 mm (14–16 mm bore) / 6 mm (18–20 mm bore) / None (8–10 mm bore) |
| Outer Diameter (approx.) | See variant options |
| Face Width (approx.) | See variant options |
| Pressure Angle | 20° |
| Gear Type | Worm Gear Wheel (Spur-cut worm wheel) |
| Finish | Natural brass (uncoated) |
| Compatible Worm Shaft Module | 1.5M |
| Weight | See variant options |
The tooth count determines your reduction ratio when paired with a single-start worm shaft: a 20T wheel gives 20:1 reduction, a 40T wheel gives 40:1. Choose a higher tooth count when you need more torque multiplication or slower output speed. For lighter loads or faster output, a 20T or 25T wheel is typically sufficient.
Select the bore that matches your shaft diameter exactly. For shafts 8 mm or 10 mm, plain bore variants are available. For shafts 12 mm and above, keyway variants are offered — the keyway prevents the gear from rotating on the shaft under load. Measure your shaft with calipers before ordering.
Yes — this wheel is machined to the standard Module 1.5 tooth profile and will mesh correctly with any commercially available 1.5M single-start or multi-start worm shaft. Confirm the module (1.5M) and the lead angle of your worm shaft are compatible with your intended reduction ratio before assembly.
Brass is softer than steel, which is intentional in worm gear design. The brass wheel acts as the sacrificial element, wearing gradually while protecting the harder steel worm shaft. This pairing reduces galling and noise. For light-to-medium duty applications — robotics, indexing tables, small actuators — brass worm wheels are the industry-standard choice.
Brass offers good resistance to oxidation and mild moisture exposure, making it suitable for indoor workshop and light industrial use. It is not recommended for continuous immersion or highly corrosive chemical environments. For outdoor or wet applications, consider applying a light machine oil to the gear teeth periodically.
Worm gear sets with high reduction ratios (typically above 20:1 with a single-start worm) exhibit self-locking behavior, meaning the output shaft cannot back-drive the worm. This is useful for positioning applications where you want the load to hold position without a separate brake. However, self-locking is not guaranteed under vibration or shock loads — always verify with your specific worm shaft lead angle.
Brass has inherent self-lubricating properties, but applying a light gear grease or machine oil to the tooth contact surfaces before first use will extend service life and reduce break-in wear. Re-lubricate periodically based on your duty cycle and operating environment.
