Easy to tighten  Fastener Expertise Q & A    No. 22
No. 22: In the connection of the tight bolt set of the pressure vessel cover, if the pre-tightening force of the bolt and the pressure inside the container are unchanged, but the soft copper gasket between the flanges is replaced by a rubber gasket, the total tension of the bolt is ______ , the tightness of the connection ______.
Previous Review---No. 21: Bolt material with strength class 6.8, its yield limit s S = _____MPa.
Answer analysis: GB/T 3098.1-2000 stipulates that in the grade of the bolt, the number in front of the point indicates 1% of the tensile strength of the bolt, and the number after the point indicates the nominal yield point of the bolt / the tensile strength of the bolt. 10 times, so the bolt of class 6.8 has a tensile strength of 600 MPa and a nominal yield point of 480 MPa. In addition, the yield point is the critical point of elastic deformation and plastic deformation, so the yield limit is the yield point.
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