... .Material: 304, 321, 316L, 347L, 310S, 904l, 430, 410 and etc.Manufacturing engineering: hot rolling, cold rolling, hot expandAbrasive style:NO 3 ... #NO 4 surface: 240 #, 320 #, 400 #Application: Line Pipe, Casing And Tubing, Fluid Pipe, Water Delivery, Heating Pipe, Power Pipe, Structure ... ) Website: http://www.hld-tech.com stainless steel hex nut and bolt