Nuts and bolts are fasteners designed to hold two--or more--objects together. This is achieved by inserting a bolt through both objects and fastening a nut to the end of the bolt. This usually simple task can be complicated by considerations ranging from the type of bolt used, to how the bolt is inserted into the objects.
Clear any obstructions from the holes prior to inserting the bolt. Check to ensure that the size of the bolt and the hole match. If the hole is threaded ensure that the threads on the bolt match and that the bolt and hole are clean. If the bolt will not screw more than a few turns into the hole the threads are likely the wrong size or damaged. To use a bolt and a nut the bolt must be longer than the objects being joined by at least the width of the nut.
Insert the bolt through the objects to be fastened with the head of the bolt facing out. If the hole is smooth the bolt can be pushed or hammered through. For threaded holes, insert the end of the bolt into the hole and turn the bolt clockwise until the head of the bolt is flush with the edge of the hole. A wrench may required to turn the bolt.
Place the nut on the end of the bolt opposite the head. While holding the head of the bolt stationary spin the nut clockwise while applying gentle pressure against the nut toward the bolt. Continue spinning the nut until it is flush with the surface of the object from which the bolt is protruding. Up to two wrenches may be required to complete this step depending on the amount of torque required to tighten the nut.