5/16″ UNF Hex Half Nut

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

A 1/4 BSF hexagon set bolt (threaded up to head)Under head dimension: 3/8". Standard hexagon size (.445" A/F)Head machined flat (no markings).

A 5/16 BSF hexagon set bolt (threaded up to head)Under head dimension: 1-1/4". Standard hexagon size (.525" A/F)Head machined flat (no markings).

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