ASME B1.20.5-1991 establishes practical gaging methods and commonly used gages for production evaluation of inch dryseal pipe threads. It covers NPTF, PTF-SAE SHORT, NPSF, and NPSI thread inspection, including functional size evaluation, taper verification, crest and root truncation checks, gage coordination, gage tolerances, working and master gage dimensions, and measurement methods for taper thread pitch diameter. The standard includes tables, figures, dimensional data, and informative appendices covering 3-step gages, wire measurement methods, calculation formulas, and turns engagement.
Application Scope: For manufacturers, inspectors, quality engineers, gage designers, and laboratories evaluating inch dryseal pipe threads and related working or master gages.
