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... Same link, long form: http://store.balancemasters.com/osCommerce/product_info.php?cPath=25&products_id=240&osCsid=aff7879712d2d6fad6f5b92484aabcd6- ...shank portion of an AN bolt is a simple geometric formula. Pi*radius(squared) defines the area of a circle. For AN6 that is: 3.14159*[(0.1875*0.1875)]= 0.1104465 inches sq...