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Hexagon Socket Button Head Screws · GB/T 70.2-2015
Socket Head Screws

Hexagon Socket Button Head Screws

GB/T 70.2-2015 (reference only)

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GB/T 70.2-2015 dimension drawing

Dimensions in mm
GB/T 70.2-2015 dimension drawing

Specification parameters

Technical conditions and referenced standards
Steel Stainless steel
General technical requirements
  • GB/T 16938
Thread
Tolerances
  • Property class 12.9 :5g6g;
  • Other property classes: 6g
Standard
  • GB/T 193, GB/T 9145
Mechanical properties
Property class
  • Property classes 8.8, 10.9 and 12.9/12.9 class a
  • A2-70, A4-70, A2-80, A4-80, A5-70, A3-70, A3-80, A5-80
Standard
  • GB/T 3098.1b
  • GB/T 3098.6c
Tolerances
Product grade
  • A
Standard
  • GB/T 3103.1
Surface treatment
  • No treatment ;
  • Electroplating d Technical requirements in accordance with GB/T 5267.1;
  • Non-electrolytically applied zinc flake coating requirements in accordance with GB/T 5267.2
  • Simple treatment ;
  • Technical requirements for passivation of stainless steel GB/T 5267.4
Any other technical requirements or surface treatments shall be agreed between the purchaser and supplier.
Surface discontinuities
  • 12.9/12.9 in accordance with GB/T 5779.3;
  • Other requirements in accordance with GB/T 5267.1
  • –
Acceptance inspection and packaging
  • GB/T 90.1, GB/T 90.2
a Use caution when considering property class 12.9/12.9. Carefully consider the fastener manufacturer’s capabilities, service conditions and tightening method. Surface treatment and the service environment can contribute to stress corrosion cracking.
b Because of the head design, these screws may not meet the minimum tensile load specified in GB/T 3098.1. They shall meet the other material and property requirements for the relevant property classes in GB/T 3098.1. In a full-size tensile test in accordance with GB/T 3098.1, each screw shall withstand the minimum tensile load in Table 3 without fracture. Continue the test to fracture, which may occur in the thread, head, shank or head-to-shank junction.
c Because of the head design, these screws may not meet the minimum tensile load specified in GB/T 3098.6. They shall meet the other material and property requirements for the relevant property classes in GB/T 3098.6. In a full-size tensile test in accordance with GB/T 3098.6, each screw shall withstand the minimum tensile load in Table 3 without fracture. Continue the test to fracture, which may occur in the thread, head, shank or head-to-shank junction.
d Electroplating should be avoided for screws of property class 12.9/12.9. See GB/T 5267.1 for further information.

Product overview

A low, rounded head with an internal hex drive. Confirm the required loadability, material, finish and length for the assembly.

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