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See Chinese contents: GB/T 800-2020 GB/T 800-2020: Countersunk Head Double Nib Bolts
This Standard specifies the types and dimensions, technical conditions, reference standards and markings of countersunk head double nib bolts. This Standard is applicable to countersunk head double nib bolts with a thread specification of M6 ~ M12, performance grade of Grade 4.8 and product grade of Grade C.
