Rigid Couplings (RM Couplings) tare da bushes na Taper Bore suna ba masu amfani da sauri da sauƙi gyara tsattsauran ra'ayi na haɗin kai tare da gamsuwa da zaɓi mai faɗi na girman ramuka na bushes na Taper Bore. Flange na namiji na iya shigar da daji daga gefen Hub (H) ko daga gefen Flange (F). Mace koyaushe tana da dajin da ya dace da F wanda ke ba da nau'ikan haɗuwa guda biyu masu yuwuwar HF da FF. Lokacin amfani da ramukan kwance, zaɓi taro mafi dacewa.