Abstract: A security fastener for helping to prevent the unauthorized removal of table top equipment, such as a personal computer, from its supporting surface, includes a base frame, which receives the equipment to be protected. A double-sided adhesive tape secured to the underside of the base frame affixes the frame to the a supporting surface. A bar moves between an opened and a closed position to permit the equipment to be removed from, and installed within the device. An inventive lock assembly is disposed within the base frame and fastens the bar in its closed locking position to secure the bar in place. The base frame is fastened together by connecting pins to enable the security fastener to be assembled in a convenient manner, and the lock assembly is similar in its external appearance to the connecting pins for concealing the locking assembly from view and for providing the fastener with an aesthetically pleasing appearance.