Cross recess
Hex socket
Hex chamfered single face
Flat round head
Cheese
Square
T-head
Triangle
Y-shape
Hex chamfered double faces
Cheese with shoulder
Octagonal
Nylon Insert
Straight-knurl
Shoulder
Blank shank
Tubular end
Semitubular end
JB/T 8004.7-1999
Inner hexagon nut