1/4 BSF x 2-1/2″ Socket Cap Bolt

A 1/4 BSF hexagon set bolt (threaded up to head) Under head dimension: 1/2″. Standard hexagon size (.445″ A/F)Head machined flat (no markings).

A 1/4 BSF hexagon bolt (part threaded)Under head dimension: 3". Thread length: 9/16". Standard hexagon size (.445" A/F)Head machined flat (no markings).

A 5/16 BSF hexagon bolt (part threaded)Under head dimension: 3-3/4".Thread length: 5/8" Standard hexagon size (.525" A/F)Head machined flat (no markings).