GB/T 70 series national standard (for hexagon screws) includes:
- GB/T 70.1 Hexagon Socket Head Cap Screws;
- GB/T 70.2 Hexagon Socket Button Head Screws;
- GB/T 70.3 Hexagon Socket Countersunk Head Screws;
- GB/T 70.4 Hexagon Socket Button Head Screws with Collar;
- GB/T 5281 Hexagon Socket Head Shoulder Screws.
This Part is the Part 4 of GB/T 70.
1 Scope
This Part of GB/T 70 specifies the type dimension, technical condition and marking of hexagon socket button head screws with collar with thread specification from M3 up to and including M16, with performance grades 08.8 and 010.9, with product grade A and with reduced loadability according to Table 3.
This Part is applicable to hexagon socket button head screws with collar screwed in thread within equipment body with internal hexagonal wrench.
2 Normative References
The following references are indispensable for the application of this document. For dated reference, only the edition cited applies. For undated references, the latest editions (including all amendments) are applicable to this document.
GB/T 2 Fasteners - Ends of Parts With External Thread (GB/T 2-2001, idt ISO 4753:1999)
GB/T 70.5 Gauging of Hexagon Sockets (GWT 70.5-2008, ISO 23429:2004,IDT)
GB/T 90.1 Fasteners - Acceptance Inspection (GB/T 90.1-2002, idt ISO 3269: 2000)
GB/T 90.2 Fasteners - Marking and Packaging
GB/T 193 General Purpose Metric Screw Threads - General Plan (GB/T 193-2003, ISO 261: 1998, MOD)
GB/T 1237 Designation System for Fasteners (GB/T 1237-2000, eqv ISO 8991: 1986)
GB/T 3098.1 Mechanical Properties of Fasteners - Bolts, Screws and Studs (GB/T 3098.6-2000, ISO 898-1: 2009, MOD)
GB/T 3103.1 Tolerances for Fasteners-Bolts, Screws, Studs and Nuts (GB/T 3103.1-2002, ISO 4759-1: 2000, IDT)
Foreword I
1 Scope
2 Normative References
3 Dimension
4 Technical Conditions and Normative References
5 Marking
