... A2,A4), 4.standard:GB,DIN,ASME,ANSI Stainless spring washer- 304,316 ,and we also provide as below ... 1) M5~M20 DIN931 Hex Bolts and DIN933 Hex Head Screws, DIN934 and ANSI/ASME Hex Nuts2) 1/4 ... "~5/8" ANSI/ASME B18.2.1 Hex Head Screws 3) M6~M20 DIN976/DIN975 Threaded Rods and ... Tapping Screws, Hex Socket Cap Screws, Cross Countersunk Head Screws and some other special fasteners can be provided as ...