Rigid Couplings (RM Couplings) karo Taper Bore bushes nyedhiyakake pangguna kanthi cepet lan gampang mbenakake shafts sing nyambungake kanthi kaku kanthi yakin saka macem-macem ukuran poros saka semak Taper Bore. Flange lanang bisa dipasang grumbulan saka sisih Hub (H) utawa saka sisih Flange (F). Sing wadon tansah nduweni grumbulan fitting F kang menehi loro bisa jinis perakitan kopling HF lan FF. Nalika nggunakake ing shafts horisontal, pilih Déwan paling trep.