HEX HEAD BOLT 1.Standard and nonstandard 2.DIN ISO UNC BSW ... 3.Zinc plated,yellow zinc plated 4.Plain,black HEX HEAD BOLT Range size: (1)Hex. BoltsDiameter.: M6~M56(1/4 ... , ANSI/ASME B 18.2.1, ISO4014/4017(2).HEX SOCKET CAP SCREWS (ALLEN BOLTS).Diamete.: M6~M56(1/4~2")Length: 500mm ... /5/8/A325)Standard:GB,ANSI,DIN,UNI,JIS,ISO HIGH QUALITY HEX HEAD BOLT