API Spec 5B-2010 Draft. Specification for Threading, Gauging and Thread Inspection of Casing, Tubing, and Line Pipe Threads

American Petroleum Institute (API). XXX Teenth Edition, June 2010. 71p. This Specification covers dimensions, tolerances and marking requirements for API threads and the gauges that control the
acceptance criteria for the threads. Thread element gauges, instruments and requirements for the inspection of threads for line pipe, round thread casing, and buttress casing connections are included. The inspection requirements include measurements of diameter, ovality, addendum, taper, lead, height, and angle of thread that are applicable to threads having 111/2 or less turns per inch (0,45 or less turns per mm). All thread dimensions shown without tolerances are related to the basis for connection design and are not subject to measurement to determine acceptance of product. The inspection procedures for all thread element inspection requirements shall be found in API Specification 5B1