HEX HEAD BOLT 1.Standard and nonstandard 2.DIN ... plated,yellow zinc plated 4.Plain,black HEX HEAD BOLT Range size: (1)Hex. BoltsDiameter.: M6~M56(1/4~2") ... , ANSI/ASME B 18.2.1, ISO4014/4017(2).HEX SOCKET CAP SCREWS (ALLEN BOLTS).Diamete.: M6~M56(1/ ... UNI,JIS,ISOincl.DIN603, ANSI/ASME 18.5, ISO8677(4)Hex. Nuts:Diameter.: 3MM--72MM (1/4"---3")Grade: 6 ... :GB,ANSI,DIN,UNI,JIS,ISO HIGH QUALITY HEX HEAD BOLT