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Re: ASD Design of Threaded Fasteners

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The "smallest cross section" you refer to is not a physical cross section.  Because the "Min. Root Area" is the area calculated based upon a circular section of diameter equal to the min. root diameter ("k").  The ("tensile stress") cross sectional area of any plane normal to the bolt axis in the threaded section is greater than this calculated area because the threads are helical... 
Mark D. Anderson  PE
----- Original Message -----
Sent: Tuesday, January 30, 2001 11:09 AM
Subject: ASD Design of Threaded Fasteners

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?
Thanks in advance,
Chris Towne