worm gears and slew drives could be customized per application and customer. Applications of the gears range between solar to mobile applications, including mining apparatus, digger derricks, solar trackers, wind Worm Gear Slew Drive generators, medical bed equipment, and robotic arm positioners. EP' worm gears are made for the smoothest rotation under optimum loads. Few products below simply 
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Materials Available
1. STAINLESS: SS201, SS303, SS304, SS316, SS416, SS420
2. Steel:C45(K1045), C46(K1046),C20
3. Brass:C36000 ( C26800), C37700 ( HPb59), C38500( HPb58), C27200(CuZn37), C28000(CuZn40)
4. Bronze: C51000, C52100, C54400, etc
5. Iron: 1213, 12L14,1215
6. Aluminum: Al6061, Al6063
7.OEM according to your request