Standard of Self tapping screws
DIN 7971-1990 Slotted pan head tapping screws
DIN 7972-1990 Slotted countersunk head tapping screws
ISO 1482-1983 Slotted countersunk head tapping screws
GBT 5282-85 Slotted pan head tapping screws
GB/T 5283-85 Slotted countersunk head tapping screws
GBT 5284-85 Slotted raised countersunk head tapping screws
GBT 5285-85 Hexagon head tapping screws