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About This Item
Full Description
Thread inspection applies at the point of manufacture prior to shipment, to inspection at any intermediate point, to inspection subsequent to delivery at destination, and to inspection by inspectors representing the purchaser or the manufacturer. The manufacturer may, at his or her option, use other instruments or methods to control manufacturing operations; but acceptance and rejection of the product is determined by the results of inspection made in accordance with the requirements of this specification.
Thread inspection is performed using instruments designed to measure either the functional relationship of multiple thread elements or measure an individual thread element. The inspection requirements include measurements of standoff, diameter, ovality, addendum, taper, lead, height, and angle of thread that are applicable to threads having 11 1/2 or less turns per inch (0.45 or less turns per mm). Ring and Plug gauges are designed to measure the functional size of an internal or external thread. Individual thread elements listed are measured with one or more specific instruments.
Document History
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API Spec 5B
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Threading, Gauging, and Inspection of Casing, Tubing, and Line Pipe Threads, Sixteenth Edition, Includes Errata 1 (2018), Errata 2 (2018), Addendum 1 (2018), Addendum 2 (2019), and Addendum 3 (2021)- Most Recent
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API Spec 5B (R2015)
Specification for Threading, Gauging and Thread Inspection of Casing, Tubing, and Line Pipe Threads, Fifteenth Edition- Historical Version
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API Spec 5B
Specification for Threading, Gauging, and Thread Inspection of Casing, Tubing, and Line Pipe Threads (US Customary Units) (Includes March 2004 Addendum)- Historical Version
Amendments, rulings, supplements, and errata
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API Spec 5B Addendum 3
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Addendum to Threading, Gauging, and Inspection of Casing, Tubing, and Line Pipe Threads, Sixteenth Edition -
API Spec 5B Addendum 2
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Addendum to Threading, Gauging, and Inspection of Casing, Tubing, and Line Pipe Threads, Sixteenth Edition -
API Spec 5B Addendum 1
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Addendum to Threading, Gauging, and Inspection of Casing, Tubing, and Line Pipe Threads, Sixteenth Edition, Includes Errata 1 (2018), Errata 2 (2018), and Addendum 1 (2018) -
API Spec 5B Errata 2
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Errata to Threading, Gauging, and Inspection of Casing, Tubing, and Line Pipe Threads, Sixteenth Edition, Includes Errata 1 (2018) and Errata 2 (2018) -
API Spec 5B Errata 1
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Errata 1 to Threading, Gauging, and Inspection of Casing, Tubing, and Line Pipe Threads, Sixteenth Edition