HFBR connectors are fiber optic connectors for plastic, polymer and HCS fibers. This means for optical fibers whose core or cladding material is made of plastic. HFBR connectors can be selected according to their locking mechanism, according to simplex and duplex designs, according to different diameters and the length of the optical fiber. The HFBR connector has been specially developed for rugged use in industrial plants and factory automation. They can be used for board-to-board, rack-to-rack connections or for proprietary local area networks. They are easy to install, relatively temperature resistant and can be used wherever there are strong mechanical stresses due to torsion and vibration.