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See Chinese contents: GB/T 70.3-2008 GB/T 70.3-2008: Hexagon socket countersunk head screws
This Standard specifies the hexagon socket countersunk head screws with: thread size is M3~M20; performance grades are 8.8, 10.9, and 12.9; and product grade is A. If other technical requirements are required, it shall select from existing standards (such as GB/T 196, GB/T 3106, GB/T 3098.1, and GB/T 3103.1).
