Slot
Cross recess
6-Lobe
Hex chamfered single face
Hex with hole
Hex with shoulder
Hex chamfered double faces
Nylon Insert
Hole on shank
Straight-knurl
Reduced shank
Normal shank
Increased shank
Shoulder
Waisted shank
Full thread
Flat point
Cone point
Dog point
Semitubular end
HG/T 20634-2009
Hexagon bolts for flange pipe
HG/T 20613-2009
Bolting for use with stral pipe falanges-Hexagon head bolts