SAE

A Dictionary of Terms for the Dynamics and Handling of Single Track Vehicles (Motorcycles, Mopeds, and Bicycles)
standard by SAE International, 01/13/2000

Trailer Grade Parking Performance Test Procedure
standard by SAE International, 06/16/2011

Specification for O-Ring Face Seal Connectors: Part 2 - Requirements, Dimensions, and Tests for Steel Unions, Bulkheads, Swivels, Braze Sleeves, Braze-on Tube Ends, Caps, and Connectors with ISO 6149-2 Metric Stud Ends and ISO 6162 4-Bolt Flange Heads.
standard by SAE International, 05/14/2013

Fitting--O-Ring Face Seal
standard by SAE International, 06/01/1989