Best choice of gearing when high drive decrease is required. Worm Tires resemble spur gears with the addition of a throat cut in to the O.D. of wheel. The throat permits the worm wheel to fully envelope the threads of the worm. Threads, not really teeth are cut on the worm, and by adjusting the amount of threads, different ratios can be achieved without altering mounting arrangements. A unique feature of Worm and Wheel assemblies is definitely their ability to prohibit back driving
Pitch: 
16 to 64 DP and 1.5 to .5 MOD
Worm wheel gear Materials: Brass for Worm Gear and Stainless Steel for Worm
Single, Dual or Quad Start