... can be taken for good quantities They are case carburised, Hardened and Tempered to HRC 55-60 ... Stainless Steel, Alloy Steel, Hardened and Tempered Steels, Case Hardened Steels, Cast Iron, or other materials like ... Worm Shafts are made from EN 353, Case Carburised, Hardened and Tempered upto 55-60 ... Shaft and Worm Gears, Spur, Helical, Double Helical, Internal Helical and Internal Spur Gears and ...