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RE: fatigue category

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Title: RE: fatigue category

>Does anyone have a reference that specifies the fatigue category
>for base metal with a small (say 1" dia) drilled or cored hole in it?

The 1999 LRFD Specification Appendix K has significantly expanded provisions for fatigue. From those, there are several cases that may apply to your application:

    Members with drilled or reamed holes: Category B

    Members with drilled or reamed holes containing bolts
    for attachment of light bracing where there is a small
    longitudinal component of brace force.: Category C

    Other providions or mechanically fastened joints range from Category B to E.

Check out the 1999 LRFD Specification here:

    https://www.aisc.org/publications/shop.asp?action="">

You have to scroll down to the bottom at that page to see it.

Charlie.