GB/T 6561-2014
Cross recessed countersunk head thread rolling screws-type H
GB/T 6561-2014
Cross recessed countersunk head thread rolling screws-type Z
DIN 7500K-2000
Slotted countersunk flat head rolling screws
UNI 8113
Countersunk flat head rolling screws-type H
GB/T 6561-1986
Cross recessed countersunk head thread forming screws-type H
DIN 7500-2007
Slotted countersunk flat head rolling screws
DIN 7500-2009
Slotted countersunk flat head rolling screws