This SAE Information Report is an introduction to lubricant classifications, specifications, and types in common use today. It emphasizes the desirability of using a minimum number of lubricants. Pertinent SAE reports are called out for easy reference. Lubricant abbreviations have been included that will assist in preparation of lubrication charts (described in SAE J753).Table 1 lists the components of construction and industrial equipment and the various lubricants which may be used. Table 2 lists lubricant types and identifying abbreviations. Lubricants that had common usage in the past are retained in Table 2 to show where the new specifications originated.