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API Spec 7-2

Specification for Threading and Gauging of Rotary Shouldered Thread Connections, Second Edition, Includes Errata (2017)
standard by American Petroleum Institute, 01/01/2017

API Std 608

Metal Ball Valves-Flanged, Threaded and Welding Ends, Fifth Edition
standard by American Petroleum Institute, 11/01/2012