Gives two systems of classification: an alpha-numeric designation applicable to machines with endshield bearings and only one shaft extension (code I) and an all-numeric designation applicable to a wide range of types of machines (code II) including types covered by code I. THIS CONSOLIDATED VERSION CONSISTS OF THE SECOND EDITION (1992) AND ITS AMENDMENT 1 (2000). THEREFORE, NO NEED TO ORDER AMENDMENT IN ADDITION TO THIS PUBLICATION.