Active standard | Published: 01/10/2026

API SPEC 5B

Threading, Gauging, and Inspection of Casing, Tubing, and Line Pipe Threads, Seventeenth Edition

Available languages: English

Available design: electronic (protected pdf), Print design

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Detail information

Designation: API SPEC 5B

Publication date: 01/10/2026

Pages: 118

Country: American technical standard

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Anotation

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, round thread tubing, and buttress casing connections are included. Thread dimensions shown without specifications (or shown as “NA”) are not subject to inspection of diameter, ovality, and addendum. Thread dimensions shown without tolerances are related to the basis for connection design and are not subject to measurement to determine acceptance of product.

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