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When your project demands a compact, high-ratio speed reduction that fits in tight spaces, standard spur gears fall short. Engineers, robotics builders, and DIY automation enthusiasts working with worm drive systems need components that mesh cleanly, hold tight tolerances, and resist wear over thousands of cycles. This Module 1.5 worm gear set is designed for exactly those applications.
The set includes worm wheels available in 20, 25, 30, and 40 tooth counts, plus worm shafts in Type B, Type C, and Type L configurations — all machined from C45 medium-carbon steel. Bore diameters range from 8 mm (0.31 in) to 20 mm (0.79 in), with keyway slots (4 mm and 5–6 mm) available on most bore sizes to ensure positive shaft engagement without slippage.
Typical use cases include DIY motorized linear actuators requiring worm gear reduction, small CNC rotary axis drives using module 1.5 worm wheel sets, and hobbyist robotic arm joints built around C45 steel worm shaft assemblies.
| Module | 1.5 |
|---|---|
| Gear Type | Worm Wheel / Worm Shaft |
| Material | C45 Carbon Steel |
| Tooth Count (Wheel) | 20 / 25 / 30 / 40 |
| Shaft Type | Type B / Type C / Type L |
| Bore Diameter Range | 8 mm – 20 mm (0.31 – 0.79 in) |
| Keyway Options | 4 mm (for 12 mm bore) / 5 mm (for 14–16 mm bore) / 6 mm (for 18–20 mm bore) |
| Pitch Diameter (Wheel) | See variant options |
| Surface Finish | See variant options |
| Quantity per Order | 1 pcs / 2 pcs / 3 pcs |
| Applicable Standards | Module 1.5 metric gear standard |
The tooth count determines your gear ratio when paired with a single-start worm shaft. A 20-tooth wheel gives a 20:1 ratio, a 40-tooth wheel gives 40:1. Choose a higher tooth count for greater torque multiplication and lower output speed; choose a lower count when you need faster output with moderate torque. Confirm your motor RPM and required output speed before selecting.
Type B is a standard-length shaft suited to most compact gearbox housings. Type C features an extended shaft end for applications requiring additional coupling length or dual-side mounting. Type L is a long-body shaft designed for deeper housings or where greater shaft engagement is needed. Check your housing depth and coupling requirements before selecting a shaft type.
A keyway provides positive rotational locking between the bore and the shaft, preventing slippage under load — recommended for any application transmitting meaningful torque. The keyway size must match the key stock on your shaft: 4 mm key for 12 mm bore, 5 mm key for 14–16 mm bore, and 6 mm key for 18–20 mm bore. If your shaft has no keyway, select the plain bore option (8 mm or 10 mm) and use a set screw or interference fit.
C45 steel offers good mechanical strength but has limited inherent corrosion resistance. For outdoor or humid environments, we recommend applying a rust-inhibiting coating, grease, or housing the gear set in a sealed enclosure. If your application requires stainless or corrosion-resistant gears, contact us to confirm availability of alternative materials.
Yes — all worm wheels and worm shafts in this listing share the same Module 1.5 tooth profile and are designed to mesh correctly with each other. Select a worm wheel (any tooth count) and a compatible worm shaft (Type B, C, or L) in the same module. Ensure the bore sizes match your input and output shafts respectively.
Measure your motor or drive shaft diameter precisely with calipers. Select the bore size that matches — for example, an 8 mm motor shaft requires the 8 mm bore option. If your shaft has a keyway, select the corresponding keyway bore variant. Avoid selecting a bore larger than your shaft diameter, as this will result in excessive play and potential damage.
These gears are well-suited for DIY CNC rotary axes, robotic arm joints, motorized camera sliders, small conveyor drives, linear actuator stages, and hobbyist automation projects requiring compact speed reduction. They are not rated for heavy industrial continuous-duty applications without additional engineering review of load, lubrication, and thermal management.
