1.Mateial:Stainless steel,carton steel or brass 2.Size from M6to M48. ... ) Equipment: 200ton-315ton's hydraulic press,bending machine,steel plate shearer,spot-welder,Sub-arc welding machine,punching ... 2) Material: ,stainless steel,carbonsteel,brass,copper with various plating;3) Surface treatment: kinds of plating(Zinc,Chrome,Tin...),Powder,Heat treatment ... 10,000-30,000 square meters flat washer din125