EP also sells equipment tooth measuring products called Equipment GAGES! Gear Gages reduce mistakes, save time and money when identifying and buying gears. These pitch templates can be found in nine sets to recognize all the standard pitch sizes: Diametral Pitch “DP”, Circular Pitch “CP”, External Involute Splines, Metric Module “MOD”, Stub Tooth, Great Pitches, Coarse Pitches and Uncommon Pitches. Refer to the section on Equipment GAGES for catalog quantities when ordering.
Materials recommended for worms can be hardened steel 
and bronze for worm gears. However, depending on the application form unhardened metal worms operate adequately and more economically with cast iron worm gears at 50% horsepower ratings. In addition to metal and hardenedsteel, worms are available in stainless, aluminium, bronze and nylon; worm gears can be found in steel, hardened metal, stainless, light weight aluminum, nylon and non-metallic (phenolic).
Basic safety PROVISION: Worm gearing should not be used as a locking mechanism to hold heavy weights where reversing actions could cause harm or damage. In applications where potential harm is nonexistent and self-locking is preferred against backward rotation after that use of a single thread worm with a low helix angle immediately locks the worm gear drive against backward rotation.
RATIOS of worm equipment sets are determined by dividing the number of teeth in the apparatus by the number of threads. Thus one threads yield higher ratios than multiple threads. All EP inc. worm equipment sets are available with either still left or right hands threads. EP inc. worm gear sets are offered with Single, Dual, Triple and Qua-druple Threads.
LUBRICATION can be an essential factor to boost performance in worm gearing. Worm equipment action generates considerable temperature, decreasing efficiency. The quantity of power transmitted at a given temperature raises as the performance of the gearing improves. Proper lubrication enhances efficiency by reducing friction and high temperature.
Do you have any referrals on the Worm wheel gear, please do not be reluctant to contact us.