Standard for countersunk head fasteners Standard GB/T70.3-2000 for countersunk head screws (socket head) The standard provides for countersunk head screws with thread sizes of M3~M20, performance classes of 8.8, 10.9 and 12.9, product class A
Dimensions of countersunk head screws
Specification table for countersunk head screws (with drawing)
Technical specification for countersunk head screws (as shown in figure)
This standard provides for slotted countersunk head screws with thread sizes M1.6 through M10 and performance classes 4.8, 5.8, A2-50, A2-70, Cu2, Cu3 and Al4, product class A
GB/T 819.1-2000 cross recessed countersunk head screws GB/T 6561-86 Cross recessed countersunk head tapping locking screws （UDC 621.882 | GB 6561-86 | ）
Cross recessed countersunk head thread forming screws
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