The information contained within this Standard does not necessarily agree with some existing specifi-cations for other rotating components and equipment. This Standard is based upon the design criteria,related to the balancing of couplings, that have evolved over many years of successful industry practice.
At first, the coupling industry informally adopted, by usage, one tenth ounce -inch as a standard of unbalance tolerance. It soon became evident that for larger couplings this was an impractical tolerance. It also became evident that the runout of the balancing arbor as well as its own unbalance were very impor-tant factors in the final potential unbalance remaining in the corrected coupling. These facts were pointed out in Paper AGMA 519.01, October, 1967, the first AGMA technical paper written on the subject of flexible couplings. Shortly after the publication of this paper, Product Group 5 asked the Technical Com-mittee to write an AGMA balancing standard for flexible couplings. It was recognized that existing balanc-ing specifications such as MIL-STD 167 (ships) and ISO 1940 did not address flexible couplings.