Rigid Couplings (RM Couplings) okhala ndi tchire la Taper Bore amapatsa ogwiritsa ntchito kukonza mwachangu komanso kosavuta kwa ma shaft olumikiza molimba mtima ndi makulidwe amitundu yosiyanasiyana a tchire la Taper Bore. Flange yamphongo imatha kuyika chitsamba kuchokera ku mbali ya Hub (H) kapena mbali ya Flange (F). Yaikazi nthawi zonse imakhala ndi chitsamba choyenerera F chomwe chimapereka mitundu iwiri yolumikizirana HF ndi FF. Mukamagwiritsa ntchito ma shafts opingasa, sankhani msonkhano wosavuta kwambiri.