This International Standard specifies the requirements for couplings for the transmission of power between the
rotating shafts of two machines for general-purpose applications in the petroleum, petrochemical and natural
gas industries. Such applications typically require couplings to transmit power at speeds not exceeding
4 000 r/min, between machines in which the first lateral critical speed is above the running speed range (stiffshaft
machines). It can, by agreement, be used for applications outside these limits.