We produce front idler of Komastu, Hitachi, Kobelco, Hyundai, Kato, Daewoo, Caterpillar, JCB, Volvo, Doosan, etc.shaft get overall Q&T heat treatment using water-based quenching liquid,gets better core hardness,mechanical properties and anti-fracture than oil-quenched type and non-Q&T type,have 25% longer working life than common one