An adaptable buckle system that can be secured to a loop in a strap or cable to replace a broken buckle or add a buckle. The present invention includes two component members, a male connector and a female connector, which removably engage to form a fastening buckle. Both components have an interlocking side-release mechanism at the end opposing the connector. The interlocking side-release mechanism comprises a receiver on one side of the component member configured to receive a prong extending from the free end of a flexible arm pivotally affixed to the other side of the component member. The flexible arm may be fed through a loop in a strap or cable. Ridges that line the inner surface of the prong and inner wall of the receiver cause a cross-biting action that secures the prong in place. The prong is released when the arm is twisted thereby rotating the prong.