I-Rigid Couplings (RM Couplings) enezihlahla ze-Taper Bore inikeza abasebenzisi ukulungiswa okusheshayo nokulula kwama-shaft axhuma ngokuqinile ngokuvumelana nokukhethwa okubanzi kosayizi be-shaft bezihlahla ze-Taper Bore. I-flange yesilisa ingaba nesihlahla esifakwe ohlangothini lwe-Hub (H) noma ukusuka ohlangothini lwe-Flange (F). Insikazi ihlale inohlobo olulingana no-F olunikeza izinhlobo ezimbili zokuhlangana okungenzeka i-HF ne-FF. Uma usebenzisa ku-shafts evundlile, khetha ukuhlanganisa okulula kakhulu.