Most shear-bearing joints need to be tightened only to the snug-tight condition. This is defined as the tightness attained by either a few hits of an impact wrench or the full effort of a worker with an ordinary spud wrench that brings the connected plies into firm contact.
The is the most common joint is the shear-bearing joint. In this joint, the load is transferred from the steel into the bolt by bearing against the shank of the bolt, carried through the bolt by shear, then into the next layer of steel by bearing of the bolt against the side of the bolt hole.
see AISC LRFD Specification (Dec. 1, 1993), Section J3.1
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