The steel is employed for high strength worm gears (worm wheel) 
and steel may be plain carbon steel or alloy steel. The metal gears usually are heat treated to be able to combine correctly the toughness and tooth hardness.
The phosphor bronze is widely used for worms drive as a way to reduce wear of the worms which is excessive with cast iron or steel.
Worm gear models are usually used to lessen speed and maximize torque. Since the worm drive undergoes more contact tension cycles than the worm equipment, the worm drive is normally of a better material.
• Cast iron provides toughness and simple manufacture.
• Cast steel provides easier fabrication, strong functioning loads and vibration resistance.
• Carbon steels are economical and good, but are vunerable to corrosion.
• Aluminum is used when low equipment inertia with some resiliency is necessary.
• Brass is inexpensive, simple to mold and corrosion resistant.
• Copper is easily designed, conductive and corrosion resilient. The gear’s power would boost if bronzed.
• Plastic is economical, corrosion resistant, silent operationally and may overcome missing the teeth or misalignment. Plastic material is a lesser amount of robust than metallic and is susceptible to temperature changes and chemical substance corrosion. Acetal, delrin, nylon, and polycarbonate plastics are normal.
This 27 tooth brass worm gear is intended to be used in combination with a worm gear to make a 27:1 decrease in speed while also changing the orientation of the rotating axis by 90 degrees. This equipment fastens to a 1/4″ shaft using a specialised 1/4″ D-hub to be used with 1/4″ D-shaft.
The manufacturing methods of worms are roughly divided among cutting, heat treated and ground after cutting and rolling. And for worm wheels, they could be approximately divided among cutting the teeth, cutting teeth after casting, and the teeth cutting after the exterior rim is usually cast around the guts of the blank.