fasteners,bolts,nuts, (1).Standard:DIN931/933 ,ANSI,BSW,JIS. (2).Size:M5-M20;1/4"-5/8" (3).Material:carbon steel Our ... -12.9, including 2 seriesof stainless steel and iron products.Carbon steel and stainless size of fasteners:M6-M45,1/4 ... /4'' Norm;ASME,DIN,JISB,GB,ISO. Such as:square bolts, hex bolts, T bolts, fastener, threaded rods,carriage bolts, carbon steel bolts