1 Subject Content and Application Scope
This standard specifies level B and level C cap head square neck bolts with the thread specification of M 6 ~M 20.
Note: varieties of commodity fastening pieces shall be given priority.
2 Normative References
GB 196 General Purpose Metric Screw Threads-Basic Profile
GB 197 General Purpose Screw Threads-Tolerances and Fits
GB 2 Fasteners-Ends of Parts with External Thread
GB 3098.1 Mechanical Properties of Fasteners-Bolts, Screws and Studs
Tolerances for Fasteners-Bolts, Screws, Studs and Nuts
GB 90 Acceptance Inspection, Mark and Package for Fastener
GB 1237 Designation System for Fasteners
3 Dimension
Type A is according to the requirements of Figure 1 and Table 1.
Type B is according to the requirements of Figure 2 and Table 2.
