Specification requirements for bolted connections

of steel structures

     Steel structure bolt connection specification requirements include many factors, the following will introduce some basic     connection specifications:
   Specification requirements for bolted connections of steel structures:
    1. In addition to the material, diameter and size of the bolt itself, the most important thing is that the elevation and                 plane position of the bolt should meet the requirements of the drawing, and the error should be within the specification.
   The friction coefficient of torsion shear high strength bolt is 0.45
   Bolt material: 20MnTiB  Nut material: 15mnvb

 What national standard is adopted for this kind of bolt and how to put forward requirements to the manufacturer when   purchasing.
   Precautions for construction environment of high strength hexagon bolt:
 2. The installation environment temperature should not be lower than - 10 degrees. When the friction surface is wet or exposed  to rain and snow, the operation should be stopped.
 3. For steel structures used in the open air or exposed to corrosive gases, after the high-strength bolts are tightened and  checked and accepted, the joints at the joints shall be sealed with waterproof or corrosion-resistant putty in time.
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