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Grade 5 bolts vs A307

Grade 5 bolts vs A307

Grade 5 bolts vs A307

Structural steel inspector noted that steel fabricator installed Grade 5 bolts in leiu of A307 as specified.  Connections are simple framed beam connections for floor beams.  Does anyone have an opinion as to any inherent problems with this?

RE: Grade 5 bolts vs A307

There are certainly cases where one would NOT want to put in a higher grade fastener, but , generally , it is not a problem.  A307 is basically an ungraded bolt and A325 is grade 5 or so.  I don't see a problem.  I have done this sort of thing many times.  One thing, which has happened to me,---the inspector may require you to torque the A325 bolts whereas the A307's do not require a specified torque (the somewhat ambiguous pull on a wrench by an average man???).  This does not hurt the job quality, just the $bottom line$.


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