Best choice 
of gearing when high drive reduction is required. Worm Tires resemble spur gears with the help of a throat cut in to the O.D. of wheel. The throat permits the worm wheel to totally envelope the threads of the worm. Threads, not tooth are cut on the worm, and by adjusting the amount of threads, different ratios may be accomplished without altering mounting arrangements. A distinctive feature of Worm and Wheel assemblies is their ability to prohibit back Worm wheel gear driving
Pitch: 16 to 64 DP and 1.5 to .5 MOD
Materials: Brass for Worm Gear and STAINLESS for Worm
Single, Double or Quad Start