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double nut anchor bolts

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i have specified a double nut connection on a column base plate at 3/4" 
diameter anchor bolt embedded in concrete at a braced frame. grade of steel anchor 
bolt is A36, grade of steel base plates are A572 grade 50.  some of the anchor 
bolts do project far enough above the base plate to get a double nut.  i have 
heard that it is not acceptable to weld nuts to anchor bolts or base plates, 
but wouldn't want to weld because all are galvanized.  is it acceptable to 
torque anchor bolt instead of using double nut, and what would acceptable torque 

thanks in advance

paul franceschi

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