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RE: ASD Design of Threaded Fasteners

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>Why is the Tensile Stress area larger than the 
>Min. Root area for threaded fasteners? (See pg 
>4-147 of ASD 9th Edition) Shouldn't I be using 
>the smallest cross section for my design? 
Bolt design is based upon the nominal area. The reductions to account for threading are already taken in the design strengths (LRFD) and allowable stresses (ASD).