This standard specifies the hexagonal socket button head screws with thread specification is M3-M l6, performance grades are 8.8, 10.9, and 12.9, production grade is Grade A.
Note: Pay special attention to the note in Table 2 and the provisions on the tensile load in Table 3.
See Appendix A for the test of the inner hexangular (normative appendix).
If needs other technical requirements, it shall select from the current standards (for instance GB/T 196, GB/T 3106, GB/T 3098.1, and GB/T 3103.1).
