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Re: Steel Connections

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hjii(--nospam--at)leland.Stanford.EDU said

<<Has anyone used Grade 5 cap screws for connections rather than A307 
bolts? The tensile strength does not seem to be an issue but I can't find 
anywhere in the code that allows for this.  Is the intent of the code to 
allow only the use of A307, A325 and A490 bolts for structural 

The AISC specifications (both ASD and LRFD) clearly require material 
with an ASTM specification.  These specification specify minimum 
for manufacture, testing, and strength.  Grade 5 materials are not subject 
the same quality steps, even if the basic chemical content is similar to 

The AISC specifications do contain provisions for "Unidentified Steel" for 
"parts of minor importance"  Reference ASD Specification A3.1.b and LRFD 
Specification A3.1b.

Rick Drake, SE
Fluor Daniel, Inc.