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old rib bolts

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A drawing dated 1958 calls out 1" rib bolts in some connections and 1" 
H.S. bolts in others. In other words, it clearly makes a distinction 
between the rib bolts and the H.S. bolts.   No ASTM references are 
given.

According to Salmon&Johnson, rib bolts were of ordinary rivet steel, but
an AISC bibliography references a 1959 paper discussing A325 rib 
bolts, so apparently there were also high strength rib bolts back then.

It appears that there is no way to deduce the strength of the rib bolts 
and that we must remove some and test them.

Would appreciate any comments on this subject.  

Also, does anyone know of references that discuss rib bolts of that 
vintage in more detail?  What ASTM would non-high-strength rib bolts 
have been supplied to back then?  Would a 1" rib bolt be installed in a 
1" hole?  Should there be head marks if the rib bolts were high strength?

Thanks,
Dave Evans, P.E.
TNH, Inc.

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