... are generally made from EN 353 case Hardening Steel and Gears are generally made from SAE 8620 Case Hardening Steel. ... of the makes) of C.D. 50, 60, 75, 85, 100 mm, Ratio 30:1 or 40:1 are usually ... Custom made as per Specifications, Drawing or Sample Worm Gears are available on very tight delivery schedules, some Worm ... of the makes) of C.D. 50, 60, 75, 85, 100 mm, Ratio 30:1 or 40:1 are usually ...