... ,F436,DIN127,1.name:flat washer2.material:carbon steel , stainless steel ,3.size:all size4.surface: zinc plated , plain ,black , H.D ... materials. For finishing, we provide black oxide, zinc electroplating, phosphate, copper plating, mechanical galvanization, hot dip galvanization, and Dacromet. Our products ... about our company, you are welcomed to visit us. zinc plated flat washer