GB/T 953-1988
Double end studs(clamping type) -Elongated type
GB/T 5282-1985
Slotted pan head tapping screws-type C
GB/T 5282-1985
Slotted pan head tapping screws-type F
GB/T 16824.1-2016
Hexagon washer head tapping screws—Type R
GB/T 5283-1985
Slotted countersunk head tapping screws-type C
GB/T 5283-1985
Slotted countersunk head tapping screws-type F
GB/T 5284-1985
Slotted raised countersunk head tapping screws-type C
GB/T 5284-1985
Slotted raised countersunk head tapping screws-type F
GB/T 5285-1985
Hexagon head tapping screws-type C
GB/T 5285-1985
Hexagon head tapping screws-type F
GB/T 16824.1-2016
Hexagon washer head tapping screws—Type F
GB/T 16824.2-2016
Hexagon flange head tapping screws —Type R
GB/T 16824.2-2016
Hexagon flange head tapping screws —Type F
GB/T 9456-1988
Cross recessed hexagon head tapping screws with indentation-type C
GB/T 9456-1988
Cross recessed hexagon head tapping screws with indentation-type F
GB/T 6560-2014
Cross recessed pan head thread rolling screws-type H
GB/T 6560-2014
Cross recessed pan head thread rolling screws-type Z
GB/T 6563-2014
Hexagon head thread rolling screws
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