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A325 anchor bolts

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I have a job in which the contractor installed the anchor bolts for moment 
frame to low.  The bolts are 1-1/4 in. A325 with heavy head nuts.  How many 
threads does it take to fully develop the bolt?  If the bolts lack 1/4 to 
3/8 of an inch from extending through the nut completely, how does one 
calculate the reduction in the capacity of the bolt?