Slot
Cheese
Hex with shoulder
Low cheese head
Cheese with hole
Ball
Hex unchamfered
Cheese with shoulder
Hole on shank
Side slotted
Straight-knurl
Shoulder
Tubular end
Semitubular end
GB/T 809-1988
Insert round nuts —Type B
DIN 547-2006
Round nuts with drilled holes in one face,through holes