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This article presents information on a non-removable sex bolts. A sex bolt is what partition makers call those two-part fasteners that consist of an externally threaded screw on one side, and an internally threaded, tubular nut on the other. When joined, the two parts form a smooth cylindrical pin with screw head caps on both ends. It's a perfect device for holding together reams of punched paper, where it's called a binder post — perhaps in deference to the more delicate sensibilities of some librarians. They're also called barrel bolts. INSET: On and off at your command.