M00044578
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API Spec 5B 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)
standard by American Petroleum Institute, 12/01/2017
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API SPECIFICATION 5B
SIXTEENTH EDITION, DECEMBER 2017
ERRATA 1, JUNE 2018
ERRATA 2, NOVEMBER 2018
ADDENDUM 1, DECEMBER 2018
(API MONOGRAM PROGRAM EFFECTIVE DATE: JULY 1, 2019)
ADDENDUM 2, NOVEMBER 2019
(API MONOGRAM PROGRAM EFFECTIVE DATE: MAY 1, 2020)
ADDENDUM 3, JANUARY 2021
(API MONOGRAM PROGRAM EFFECTIVE DATE: AUGUST 1, 2021)
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Users of this specification should not rely exclusively on the information contained in this document. Sound business, scientific, engineering, and safety judgment should be used in employing the information contained herein.
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Copyright © 2017 American Petroleum Institute
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the term “shall” denotes a minimum requirement in order to conform to the standard;
the term “should” denotes a recommendation or that which is advised but not required in order to conform to the standard;
the term “may” is used to express permission or a provision that is optional; and
the term “can” is used to express possibility or capability.
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Suggested revisions are invited and should be submitted to the Standards Department, API, 200 Massachusetts Avenue, NW, Suite 1100, Washington, DC 20001, standards@api.org.
iii
Page
Scope 1
Coverage—Threading and Gauging 1
Coverage—Inspection 1
Application of the API Monogram 1
Other Applications 1
Normative References 1
Terms, Definitions, and Abbreviations 2
Terms and Definitions 2
Abbreviations 6
Thread Dimensions and Tolerances—Line Pipe, Round Thread Casing and Tubing, and Buttress Thread Casing 7
Thread Measurement 7
Visual Inspection 7
Thread Precision 8
Thread Design 8
Chamfer 9
Internal Thread 9
Thread Finish 9
Thread Control 9
Thread Elements 9
Misalignment 9
Misalignment Tests (Options) 10
Misalignment Rejects (Purchaser Option) 10
Full Crested Thread Length 10
Rounded Nose 10
Thread Inspection 34
Line Pipe, Round Thread Casing and Tubing, and Buttress Thread Casing Precautions 34
Location of Measurements 34
Taper Measurement 37
Lead Measurement 41
Height and Addendum Measurement 43
Angle and Thread Form Measurement 51
Single Dial Buttress Thread Form Gauge 53
Coupling Thread Alignment 54
Calibration of Instruments and Dial Gauges 57
Diameter, Ovality, and Size Gauging Practice 58
Line Pipe, Round Thread Casing and Tubing, and Buttress Thread Casing 58
Gauge Specification 72
Line Pipe, Round Thread Casing and Tubing, and Buttress Thread Casing 72
API Gauge Certification 91
Line Pipe, Round Thread Casing and Tubing, and Buttress Thread Casing 91
Thread Marking 92
Annex A (informative) API Monogram Program, Use of the API Monogram by Licensees 94
Annex B (informative) Supplementary Requirements 98
v
Page
Annex C (informative) Instructions for Shipment of Master Gauges 104
Bibliography 105
Figures
Basic Dimensions of Buttress Threads Hand-tight Make-up 11
Buttress Casing Thread Form and Dimensions (Casing sizes 41/2 in. through 133/8 in.) 12
Buttress Casing Thread Form and Dimensions (Casing sizes 16 in. and larger) 13
Basic Dimensions of Line Pipe Hand-tight Make-up 13
Basic Dimensions of Casing Round Threads Hand-tight Make-up 14
Casing Round Thread Dimensions 15
Casing Round Thread Form 15
Basic Dimensions of Tubing Round Threads Hand-tight Make-up 16
Round Nose Ends 16
Line Pipe Thread Form 17
Tubing Round Thread Form 17
8 Round Tubing Thread Dimensions 18
10 Round Tubing Thread Dimensions 18
Measuring Interval (8-round Tubing Pin) 35
Measuring Interval (8-round Coupling) 35
Measuring Interval (Buttress Pin) 36
Measuring Interval (Buttress Coupling) 36
External Thread Taper Measurements (Gauge Set near First Perfect Thread) 38
External Thread Taper Measurements (Measurement at Last Perfect Thread) 38
Buttress Thread Run-out Measurements 39
Internal Thread Taper Measurements 39
Internal Taper Measurements (41/2 in. and smaller) 40
Internal Lead Gauge on Standard Template 42
Lead Gauge on Pin Thread 42
Lead Gauge on Coupling Thread 43
Thread Height Contact Point (Round Thread Height Gauge) 44
Thread Height Contact Point (Buttress Thread Height) 44
External Addendum Contact Point (Round Thread Addendum Gauge) 44
Internal Thread Height Gauge on Setting Standards (Buttress Thread Height Gauge on Block) 46
Internal Thread Height Gauge on Setting Standards (8R and 10R Thread Height Gauge on Block) . . . 46
Internal Addendum Gauge on Setting Standards (8R and 10R Addendum Gauge on Block) 47
External Thread Height Gauge on Setting Standards (Buttress Thread Height Gauge on Block) 47
External Thread Height Gauge on Setting Standards (8R and10R Thread Height Gauge on Block) . . . 47
External Addendum Gauge on Setting Standards (8R and 10R Addendum Gauge on Block) 48
Round Thread Height Gauge Setting Standard (Thread Addendum Standard) 48
Round Thread Height Gauge Setting Standard (Thread Height Standard) 48
Buttress Height Gauge Setting Standard (1 in. TPF Buttress Thread Height Standard) 49
Round Thread Height Gauge Setting Standard (3/4 in. TPF Buttress Thread Height Standard) 49
External Addendum Gauge on Pin Threads (Round Thread Addendum Gauge) 49
External Thread Height Gauge on Pin Threads (Round Thread Height Gauge) 50
External Thread Height Gauge on Pin Threads (Buttress Thread Height Gauge) 50
Internal Thread Height Gauge on Coupling Threads (Round Thread Height Gauge) 50
Internal Addendum Gauge on Coupling Threads (Round Thread Addendum Gauge) 51
Internal Thread Height Gauge on Coupling Threads (Buttress Thread Height Gauge) 51
vi
Page
Figures (continued)
External Thread Form Overlays for 8 Round Threads 52
External Thread Form Overlays for Buttress Threads 52
External Thread Form Overlays for Buttress Threads (Measured from Root) 53
Buttress Tooth Width Gauge (Measured from Thread Crest) 53
Buttress Groove Width Gauge 54
Equipment for Measuring Coupling Alignment and Concentricity 55
Coupling Alignment Gauge 55
Coupling Alignment Inspection 56
Coupling Alignment Inspection (Detail) 56
External Thread Crest Diameter Gauge Location 59
Internal Thread Crest Diameter Gauge Location 59
Average Crest Diameter 60
Ovality 60
8 Round Casing Thread Ring Standoff 65
8 Round Casing Thread Plug Standoff 65
Gauging Practice for Line Pipe Threads, Casing, and Tubing Round Thread Hand-tight Assembly . . . 67
Gauging Practice for Buttress Casing Threads Hand-tight Assembly 68
Comparison of Line Pipe Gauges Made Subsequent to 1940 and Gauges Made Prior to 1940 71
Thread Gauge for Line Pipe and Round Thread Casing and Tubing
(Taper sizes 41/2 in. through 133/8 in.) 86
Thread Gauge for Buttress Casing 87
Gauge Thread Form for Line Pipe and Round Thread Casing and Tubing 87
Gauge Thread Form and Dimensions for Buttress Casing (Taper sizes 41/2 in. through 133/8 in.) 88
Gauge Thread Form and Dimensions for Buttress Casing (Taper sizes 16 in. and larger) 89
Bolt Circles and Back-up Plate Dimensions for Line Pipe, Buttress Casing and
Short or Long Round Casing Master Plug Gauges 90
Basic Dimension of Power Tight Make-up 98
SR 22 Casing Round Thread Form (API 8-Round Internal Threadform) 103
SR 22 Casing Round Thread Form (API 8-Round External Threadform) 103
SR 22 Casing Round Thread Form (API 8-Round Mated Threadform) 103
vii
Tables
Page
Casing Short-thread Dimensions 19
Tolerances on Buttress Casing Thread Dimensions 21
Line Pipe Thread Dimensions 23
Casing Long-thread Dimensions 24
Buttress Casing Thread Dimensions 25
Non-upset Tubing Thread Dimensions 26
External-upset Tubing Thread Dimensions 27
External-upset Long Round Thread Dimensions for Fiberglass Pipe 28
Integral-joint Tubing Thread Dimensions 28
Round Nosed Ends 29
Casing Round Thread Height Dimensions 29
Tolerances on Casing Round Thread Dimensions 30
Line Pipe Thread Height Dimensions 31
Tolerances on Line Pipe Dimensions 31
Tubing Round Thread Height Dimensions 32
Tolerances on Tubing Round Thread Dimensions 32
Contact Point Dimensions for Taper and Run-out Gauges 37
Contact Point Dimensions for Lead Gauge 41
Compensated Thread Lengths for Measurements Parallel to the Taper Cone 42
Contact Point Dimensions for Addendum Gauge 45
Thread Height Groove Check Blocks 45
Buttress Thread Height Groove Check Blocks 45
Thread Addendum Groove Check Blocks 45
Dial Gauge Error Check 57
Thread Ovality Maximum for Standoff 62
Max Allowable Standoff for Given Values of Thread Ovality (3/4 in. TPF) 63
Max Allowable Standoff for Given Values of Thread Ovality (1 in. TPF) 64
Standoff Tolerances 69
Gauge Standoff Tolerance for Acceptance 70
Gauge Standoff Correction Factor 71
Line Pipe Thread Gauge Dimensions 74
Short and Long Round Casing Thread Gauge Dimensions 75
Buttress Casing Thread Gauge Dimensions 76
Non-upset Tubing Thread Gauge Dimensions 77
External-upset Tubing Thread Gauge Dimensions 78
Integral-joint Tubing Thread Gauge Dimensions 79
Gauge Thread Height Dimensions for Line Pipe 80
Gauge Thread Height Dimensions for Round Thread Casing and Tubing 80
Tolerances on Gauge Dimensions for Line Pipe 81
Tolerances on Gauge Dimensions for Round Thread Casing and Tubing 82
Tolerances on Gauge Dimensions for Buttress Casing 83
Enhanced Leak Resistance LTC Thread Dimensions 100
Dimensional Tolerances on SR 22 Casing 8-Round Thread Dimensions 102
viii
Threading, Gauging, and Inspection of Casing, Tubing, and Line Pipe Threads
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.
Thread inspection applies at the point of manufacture prior to shipment, to inspection at some 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 111/2 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.
See API 5B1 for additional inspection procedures.
If product (master gauges only) is manufactured at a facility licensed by API and it is intended to be supplied bearing the API Monogram, the requirements of Annex A apply.
By agreement between the purchaser and manufacturer, the supplemental requirements for Enhanced Leak Resistance LTC in API 5TRSR22 and Annex B apply.
Information on the shipping of Master Gauges can be found in Annex C.
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any addenda or errata) applies.
API Recommended Practice 5A3, Thread Compounds for Casing, Tubing, Line Pipe, and Drill Stem Elements
API Specification 5L, Line Pipe Specifications, 6th Edition
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