This Standard specifies the cup head square neck bolts with small head, short neck, and threads from M6 up to and including M20, of product grade B.
If, in special cases, specifications other than those listed in this standard are required, it is recommended that they shall be selected from existing standards (e.g. GB/T 193, GB/T 196, GB/T 197, GB/T 3106, GB/T 3098.1, and GB/T 3103.1).
Note: Varieties of commodity fastening pieces shall be given priority.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, all editions cited are valid. All standards are subject to revision, and all parties using this standard are encouraged to investigate the possibility of applying the latest editions of the following standards.
GB/T 90-1985 Acceptance inspection, marking and packaging of fasteners
GB/T 193-1981 General purpose screw threads - Diameters and pitches from 1 to 600 mm
GB/T 196-1981 General purpose screw threads - Basic dimensions for diameter from 1 to 600 mm
GB/T 197-1981 General purpose screw threads - Tolerances and fits for diameter from 1 to 355mm
GB/T 1237-1988 Designation system for fasteners
GB/T 3098.1-1982 Mechanical properties of fasteners - Bolts, screws and studs
GB/T 3103.1-1982 Tolerances for fasteners - Bolts, screws and nuts
GB/T 3106-1982 Bolts, screws and studs - Nominal lengths, and thread lengths for general purpose bolts
