Mod 1.5 Worm Gear Wheel Brass 25 Tooth Worm Shaft 45# Steel Precision Ø 8-17 mm

The A, B, and C type designations refer to different shaft configurations — typically differing in overall length, shaft end style, or mounting geometry. A Type is the most compact, B Type offers a longer shaft extension on one end, and C Type provides extensions on both ends. Choose based on your housing design and how the shaft will be supported by bearings.

Mod 1.5 worm drives with a single-start worm typically exhibit self-locking behavior, meaning the output (gear) cannot back-drive the input (worm shaft) under static load. This makes them suitable for positioning stages, lifting arms, and indexing tables. However, self-locking is not guaranteed under vibration or dynamic shock loads — always verify with your specific application requirements.

Select the bore diameter that matches your shaft diameter exactly. For a keyed connection, also match the keyway dimension to your shaft's key slot — 3×1.4 mm for 8–10 mm shafts, 4×1.8 mm for 10–12 mm shafts, and 5×2.3 mm for 14–17 mm shafts are common DIN pairings. If your shaft is plain (no key), choose the plain bore option and secure with a set screw or interference fit.

Pairing a brass worm gear with a steel worm shaft is a standard engineering practice for worm drives. The softer brass gear conforms slightly to the harder steel worm, improving contact area and reducing noise. It also acts as the sacrificial wear component — the gear wears before the shaft, making replacement easier and less costly. This combination also reduces friction and the risk of galling under the sliding contact inherent in worm drive geometry.

Brass has moderate corrosion resistance and performs well in mildly humid environments. The 45# carbon steel worm shaft is susceptible to rust if exposed to moisture without protection — apply grease or a corrosion-inhibiting lubricant and consider a sealed housing for outdoor or wet applications. For highly corrosive environments, contact us to confirm material suitability before ordering.

Worm drives generate significant sliding friction and benefit from a dedicated worm gear oil or a high-viscosity EP (extreme pressure) grease. Avoid standard bearing grease, which may not provide adequate film strength under the sliding contact. For light-duty or low-speed applications, a lithium-based grease is acceptable. Relubricate periodically based on operating hours and load.

Yes. Mod 1.5 worm gear sets are widely used in DIY CNC rotary axes, robotic joint actuators, and small automation stages where a compact 90° drive with a high reduction ratio and self-locking behavior is needed. Ensure your motor torque and speed are matched to the gear ratio and load requirements of your specific application.