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
DIN 431-1982
Hexagon pipe nuts with thread as in ISO 228-1
DIN 431-2000
DIN 431-2013