... din975 name:thread bars standard:din975 surface:zinc plated , black , plain , H.G.D grade:4.8 , 8,8 Our ... main products are bolts, screws, nuts, machine screws, plain washers, spring lock washers, wood screws, tapping screws, drilling ... aluminum, brass or other special materials. For finishing, we provide black oxide, zinc electroplating, phosphate, copper plating, mechanical galvanization, hot ...