This SAE Standard covers complete general and dimensional specifications for the various types of lubrication fittings and related threaded components intended for general application in the automotive and allied fields.
Rationale: Correct thread dimension in Figure 6 (2015) the thread length is measured from the start of the shank length to the end of the visual thread representation. In Figure 2A (2008) the thread length is measured from the chamfer to the end of the visual thread representation.
This change on the start point of measure, changes the concept when the ring gage is used to check the quality of the threads. 2015 version, there is a portion of the piece which shouldn´t be part of the thread length, compared with 2008 version.