... :din975 surface:zinc plated , black , plain , H.G.D grade:4.8 , 8,8 Our main products are bolts, screws, nuts, machine screws, plain ... specifications or upon our customers' special requirements, in grades 4.8, 6.8, 8.8, 10.9, 12.9, A2-50, A2-70, and ... interested in cooperating with us or our products, please don't hesitate to contact us. If you want to get more ...