Referred to as "D.A. bolts," double-arming bolts are used for double arm applications (one arm on each side of the pole) because of the ease of installation if replacement of the cross arm is necessary and offer flexibility of use. D.A. bolts are manufactured to specifications that meet the requirements of ANSI C135.1. They are available in a range of thread diameters and lengths. Each bolt includes four assembled square nuts unless specified otherwise. Threads are formed with the rolled thread process. Bolt length is measured from the last thread, end to end. Semi-cone point comes on bolts 8" and longer in ½", 5/8", and ¾" diameters. All others have chamfered or rounded ends.