Round head
Countersunk head
Raised countersunk head
Round head with collar
Undercut countersunk head
Raised Undercut countersunk head
Low cheese head
Raised cheese
GB/T 818-2000
Pan head screws with type Z cross recess
GB/T 820-1985
Cross recessed raised countersunk head screws-type H
GB/T 820-1985
Cross recessed raised countersunk head screws-type Z
GB/T 822-2016
Cheese head screws with cross recess-type H
GB/T 822-2016
Cheese head screws with cross recess-type Z
GB/T 823-1988
Small pan head screws with cross recess
GB/T 822-2000
Cheese head screws with cross recess-type H
GB/T 822-2000
Cheese head screws with cross recess-type Z
GB/T 822-1988
Cheese head screws with cross recess-type H
GB/T 819.1-2000
Countersunk flat head screws with type H cross recess
GB/T 819.1-2000
Countersunk flat head screws with type Z cross recess
GB/T 819.2-1997
Countersunk flat head screws with type H cross recess(deep)
GB/T 819.2-1997
Countersunk flat head screws with type Z cross recess(deep)
GB/T 819.2-1997
Countersunk flat head screws with type H cross recess(shallow)
GB/T 819.2-1997
Countersunk flat head screws with type Z cross recess(shallow)
GB/T 820-2000
Cross recessed raised countersunk head screws-type H
GB/T 820-2000
Cross recessed raised countersunk head screws-type Z
GB/T 820-2015
Cross recessed raised countersunk head screws-type H
GB/T 820-2015
Cross recessed raised countersunk head screws-type Z
GB/YB 818
Pan head screws with type H cross recess
