TM 9-243HOW TO USE A BOX WRENCH1 Select the size of wrench that fits the nut or bolt.2Place the wrench (1) on the nut or bolt (2). Swing thewrench clockwise to tighten and counterclockwiseto loosen for a right hand threaded nut or bolt.Reverse the above for a left hand threaded nut orbolt.3 If there is insufficient room to swing the wrench in afull circle, lift it completely off the nut when it comesto the limit of the swing, and place it in a newposition, permitting another swing. A swing throughof a 15 degree arc is usually sufficient to continu-ously loosen or tighten a nut or bolt.4After the nut is tight, give it a final tightening.USING A SOCKET WRENCH1Select the size of socket (1) that fits the nut or bolt tobe turned and push it onto the handle (2) which isbest suited to the job.2If there is room to swing, use the ratchet handle.(The handle may be made to ratchet in one directionfor tightening work and in the other direction forloosening work.)3 Swing the handle back and forth to turn the nut in the25-14desired direction. (The socket need not be raisedfrom the nut at the end of each swing.)4 When a tight nut is to be loosened or a nut is to beset up, the nut hinged handle (3) can be swung atright angles to the socket to provide the most lever-age. At the point where the nut turns easily, thehandle can be swung to a vertical position andtwisted rapidly between the fingers in the samemanner as a screwdriver.
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