ANSI 18.2.1 B8 3/8 -16UNC X 2 Hexagon Bolt
Material B8 , equal SS304.
standard : ANSI 18.2.1 .
it is 3/8" UNC thread , and length is 2".
this like thread is different with metric .
and it is America standard , not DIN , not ISO.
we supply a lot of fasteners to USA.