The two flanges are identical in all respects except that one has a circular projection and other has corresponding recess to make a register. When the two faces of flanges are brought in contact the projection fits into recess ensuring condition of coaxiality. The flanges are further connected through bolts placed near the periphery of the flanges. The faces of flanges are machine finished true right angled to the axis of shaft. The power may be transmitted by friction between the faces or by bolts in which case bolts will be subjected to shearing stress.