API Spec 20E

Alloy and Carbon Steel Bolting for Use in the Petroleum and Natural Gas Industries, Second Edition, Includes Addendum 1 (2018) and Addendum 2 (2019)
standard by American Petroleum Institute, 02/01/2017

API Spec 7-2

Specification for Threading and Gauging of Rotary Shouldered Thread Connections, Second Edition, Includes Errata (2017), Errata 2 (2019), and Addendum 1 (2020)
standard by American Petroleum Institute, 01/01/2017