Round head
Countersunk head
Raised countersunk head
Cheese
Round head with collar
Low cheese head
Raised cheese
GB/T 6191-1986
6-Lobe cap screws,class 8.8
GB/T 6190-1986
6-Lobe cap screws,class 4.8
GB/T 2671.1-2004
6-Lobe low cap screws
Q 210-1999
6-Lobe cap screws
GB/T 2671.1-2017
6-Lobe low cap screws
Q 212-2012
6-Lobe low cap screws