fasteners,bolts,nuts, (1).Standard:DIN931/933 ,ANSI,BSW,JIS. (2).Size:M5-M20;1/ ... ,we also produce other products as follows: We mainly produce standard and non-standard fastener of grade 4.8-12.9, including 2 seriesof ... ,GB,ISO. Such as:square bolts, hex bolts, T bolts, fastener, threaded rods,carriage bolts, carbon steel bolts