PICTURES ARE REPRESENTATIVE OF ITEM, BUT ARE NOT OF THE ACTUAL ITEM. Product dimensions, finish, head markings, thread length, stamping shape or forging shape, etc., may differ from picture. Products are guaranteed to meet the specifications to which they are manufactured. Specifications allow for tolerances in dimension and shape, which can vary from lot to lot. A zinc alloy, double chamfered hex nut with significantly less surface area than a standard hex nut. Each size nut contains a single thread. Less costly than screw machine nuts. The die-cast alloy is non-corroding and will not gall or freeze on mating threads.