SAE AS 3151

SAE AS 3151 Bolt, Machine - Double Hexagon Extended Washer Head, Close Tolerance Shank, AMS 4967, .4375-20 UNJF-3A ( Reaffirmed: Mar 1982 Nov 1991 May 1995 Oct 2001 Oct 2006 )

standard by SAE International, 11/01/1976