EN ISO 10424-2:2007

SLOVENSKI STANDARD
01-februar-2009
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Petroleum and natural gas industries - Rotary drilling equipment - Part 2: Threading and
gauging of rotary shouldered thread connections (ISO 10424-2:2007)
Erdöl- und Erdgasindustrie - Bohr- und Förderanlagen - Teil 2: Verschraubungen,
Kalibrierung und Prüfung von drehenden Schulteransatz-Gewindeverbindungen (ISO
10424-2:2007)
Industries du pétrole et du gaz naturel - Équipements de forage rotary - Partie 2: Filetage
et calibrage des connexions rotary filetées a épaulement (ISO 10424-2:2007)
Ta slovenski standard je istoveten z: EN ISO 10424-2:2007
ICS:
75.180.10 Oprema za raziskovanje in Exploratory and extraction
odkopavanje equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 10424-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2007
ICS 75.180.10
English Version
Petroleum and natural gas industries - Rotary drilling equipment
- Part 2: Threading and gauging of rotary shouldered thread
connections (ISO 10424-2:2007)
Industries du pétrole et du gaz naturel - Équipements de Erdöl- und Erdgasindustrie - Bohr- und Förderanlagen - Teil
forage rotary - Partie 2: Filetage et calibrage des 2: Verschraubungen, Kalibrierung und Prüfung von
connexions rotary filetées à épaulement (ISO 10424- drehenden Schulteransatz-Gewindeverbindungen (ISO
2:2007) 10424-2:2007)
This European Standard was approved by CEN on 2 November 2007.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2007 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 10424-2:2007: E
worldwide for CEN national Members.

Contents Page
Foreword.3

Foreword
This document (EN ISO 10424-2:2007) has been prepared by Technical Committee ISO/TC 67 "Materials,
equipment and offshore structures for petroleum and natural gas industries" in collaboration with Technical
Committee CEN/TC 12 “Materials, equipment and offshore structures for petroleum, petrochemical and
natural gas industries” the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by May 2008, and conflicting national standards shall be withdrawn at the
latest by May 2008.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 10424-2:2007 has been approved by CEN as a EN ISO 10424-2:2007 without any
modification.
INTERNATIONAL ISO
STANDARD 10424-2
First edition
2007-11-15
Petroleum and natural gas industries —
Rotary drilling equipment —
Part 2:
Threading and gauging of rotary
shouldered thread connections
Industries du pétrole et du gaz naturel — Équipements de forage
rotary —
Partie 2: Filetage et calibrage des connexions rotary filetées à
épaulement
Reference number
ISO 10424-2:2007(E)
©
ISO 2007
ISO 10424-2:2007(E)
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©  ISO 2007
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ii © ISO 2007 – All rights reserved

ISO 10424-2:2007(E)
Contents Page
Foreword. v
Introduction . vi
1 Scope .1
2 Conformance — Units of measurement .1
3 Normative references .2
4 Terms, abbreviated terms, definitions and symbols.2
4.1 Terms and definitions .2
4.2 Design types and definitions.4
4.3 Abbreviations and symbols.6
5 Information to be supplied by purchaser.8
6 Threading.8
6.1 Thread profile and dimensions .8
6.2 Bevels for drill collars and tools that mate directly with drill collars.15
6.3 Low-torque feature .16
7 Product optional features .18
7.1 General.18
7.2 Stress-relief features .18
7.3 Benchmarks .21
7.4 Surface treatment .23
7.5 Cold working .23
7.6 Break-in.23
8 Product gauging .23
8.1 Gauging .23
8.2 Stand-off measurement.24
8.3 Gauge contact points .24
8.4 Lead measurement .25
8.5 Taper measurement.27
8.6 Thread height measurement and gauges .27
9 Gauge relationships for rotary shouldered connections .27
9.1 Gauge relationship .27
9.2 Gauge specifications.28
10 Gauge calibration.40
10.1 Calibration system.40
10.2 Acceptance criteria.40
10.3 Gauge measurement methods .40
10.4 Gauge certification .46
Annex A (informative) Tables in USC units .47
Annex B (informative) Care and use of regional master gauges .56
Annex C (normative) Shipment of reference master gauges .58
Annex D (normative) Care and use of working gauges .60
Annex E (informative) API gauge certification requirements .61
Annex F (informative) Other rotary shouldered connections.64
Annex G (informative) USC units conversion table .85
ISO 10424-2:2007(E)
Annex H (informative) Recommended practice for gauging new rotary shouldered connections. 86
Annex I (informative) Calculations. 92
Annex J (informative) API grand and regional master rotary connection gauges . 96

iv © ISO 2007 – All rights reserved

ISO 10424-2:2007(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 10424-2 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures
for petroleum, petrochemical and natural gas industries, Subcommittee SC 4, Drilling and production
equipment.
ISO 10424 consists of the following parts, under the general title Petroleum and natural gas industries —
Rotary drilling equipment:
⎯ Part 1: Rotary drill stem elements
⎯ Part 2: Threading and gauging of rotary shouldered thread connections
ISO 10424-2:2007(E)
Introduction
This International Standard is based on API Spec 7, Specification for rotary drill stem elements.
Users of this International Standard should be aware that further or differing requirements may be needed for
individual applications. This International Standard is not intended to inhibit a vendor from offering, or the
purchaser from accepting, alternative equipment or engineering solutions for the individual application. This
may be particularly applicable where there is innovative or developing technology. Where an alternative is
offered, the vendor should identify any variations from this International Standard and provide details.

vi © ISO 2007 – All rights reserved

INTERNATIONAL STANDARD ISO 10424-2:2007(E)

Petroleum and natural gas industries — Rotary drilling
equipment —
Part 2:
Threading and gauging of rotary shouldered thread
connections
1 Scope
This part of ISO 10424 specifies requirements on rotary shouldered connections for use in petroleum and
natural gas industries, including dimensional requirements on threads and thread gauges, stipulations on
gauging practice, gauge specifications, as well as instruments and methods for inspection of thread
connections. These connections are intended primarily for use in drill-string components.
Other supplementary specifications can be agreed between interested parties for special tolerance
requirements, qualification, testing, inspection and finishing.
This part of ISO 10424 is applicable to the following preferred rotary shouldered connection designs:
a) number (NC) style;
b) regular (REG) style;
c) full hole (FH) style.
These are traceable to an internationally supported system of gauges and calibration
2 Conformance — Units of measurement
In this part of ISO 10424, data are expressed in both the International System (SI) of units and the United
States Customary (USC) system of units. Separate tables for data expressed in SI units and USC units are
given in the body of this part of ISO 10424 and Annex A, respectively. Figures express data in both SI and
USC units. For a specific order item, it is intended that only one system of units be used, without combining
data expressed in the other system. Annex G provides the conversion between SI and USC units used in this
part of ISO 10424.
Products manufactured to specifications expressed in either of these unit systems shall be considered
equivalent and totally interchangeable. Consequently, compliance with the requirements of this part of
ISO 10424 as expressed in one system provides compliance with requirements expressed in the other
system. For data expressed in the SI system, a comma is used as the decimal separator and a space as the
thousands separator. For data expressed in the USC system, a dot (on the line) is used as the decimal
separator and a space as the thousands separator.
In the text, data in SI units are followed by data in USC units in brackets.
ISO 10424-2:2007(E)
3 Normative references
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 amendments) applies.
ISO 10424-1, Petroleum and natural gas industries — Rotary drilling equipment — Part 1: Rotary drill stem
elements
1)
ISO 11961 , Petroleum and natural gas industries — Steel drill pipe
ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories
API Spec 7, Specification for Rotary Drill Stem Elements
4 Terms, abbreviated terms, definitions and symbols
4.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
4.1.1
bevel diameter
outside diameter of the contact face of the rotary shouldered connection
4.1.2
box connection
box end
threaded connection on oil country tubular goods with internal (female) threads
4.1.3
box thread
internal (female) threads of a rotary shouldered connection
4.1.4
break-in
procedure applied to newly manufactured threads to assure correct mating
4.1.5
calibration system
documented system of gauge calibration and control
4.1.6
cold working
plastic deformation of the surface of the connection at a temperature low enough to induce strain hardening
4.1.7
first perfect thread
thread furthest from the sealing face on a pin, or closest to the sealing face on a box, where both the crest and
the root are fully formed
4.1.8
full-depth thread
thread in which the thread root lies on the minor cone of an external thread or lies on the major cone of an
internal thread
1) To be published. (Revision of ISO 11961:1996)
2 © ISO 2007 – All rights reserved

ISO 10424-2:2007(E)
4.1.9
gauge point
imaginary plane, perpendicular to the thread axis of rotary shouldered connections at which the pitch
diameter, C, at gauge point is measured
NOTE This plane is located 15,875 mm (0.625 0 in) from the make-up shoulder of the pin thread.
4.1.10
interchange stand-off
stand-off between each member of a gauge set and a corresponding gauge next higher in the ranking
scheme: grand master or regional master, reference master, working gauge
4.1.11
lead
distance parallel to the thread axis from a point on a thread turn and the corresponding point on the next turn,
i.e. the axial displacement of a point following the helix one turn around the thread axis
4.1.12
make-up shoulder
sealing shoulder on a rotary shouldered connection
4.1.13
manufacturer
firm, company or corporation that operates facilities capable of cutting the threads and is responsible for
compliance with all the applicable provisions of this part of ISO 10424
4.1.14
master gauge
gauges used for calibration of other gauges
NOTE These include reference master, regional master and grand master gauges.
4.1.15
mating stand-off
stand-off between the plug and ring members of a gauge set
NOTE Interchange stand-off is the stand-off between each member and a gauge higher in the ranking scheme.
4.1.16
pin connection
pin end
threaded connection on oil country tubular goods with external (male) threads
4.1.17
pin thread
external (male) threads of a rotary shouldered connection
4.1.18
pitch
axial distance between successive threads, which, in a single start thread, is equivalent to lead
4.1.19
pitch cone
imaginary cone whose diameter at any point is equal to the pitch diameter of the thread at the same point
4.1.20
pitch diameter
diameter at which the distance across the threads is equal to the distance between the threads
ISO 10424-2:2007(E)
4.1.21
product
drill string component with rotary shouldered connection in accordance with this part of ISO 10424
4.1.22
reference dimension
dimension that is a result of two or more other dimensions
4.1.23
rotary shouldered connection
thread connection used on drill stem elements which has coarse, tapered threads and sealing shoulders
4.1.24
stand-off
distance between faces of gauges, or gauge and product when mated
4.1.25
stress-relief groove
〈feature〉 modification performed on rotary shouldered connections that removes a certain length of the
unengaged threads of the pin or box
NOTE This process reduces the likelihood of fatigue cracking in the highly stressed area both for box and pin threads
due to a reduction of stress concentration.
4.1.26
taper
increase in the diameter of the pitch cone with length
NOTE The taper is expressed in millimetres per millimetre (inches per foot) of thread length.
4.1.27
thread form
thread profile in an axial plane for a length of one pitch
4.1.28
thread height
distance between the crest and root, normal to the axis of the thread
4.1.29
tolerance
amount of variation permitted
4.1.30
working gauges
gauges used for gauging rotary shouldered connections
4.2 Design types and definitions
NOTE Any style of rotary shouldered connection can be made in right-hand (RH) or left-hand (LH) versions.
Right-hand is assumed unless otherwise designated as LH.
4.2.1
full-hole style
FH style
type and size of rotary shouldered connection having thread form of V-040 or V-050
NOTE The number relates to a historical drill-pipe size.
4 © ISO 2007 – All rights reserved

ISO 10424-2:2007(E)
4.2.2
GOST Z style
type and size of the rotary shouldered connection, covered by a Russian standard and having the V-038R,
V-040 or V-050 thread form
NOTE The number designation is the pin-base diameter, rounded to units of millimetres.
4.2.3
H90 style
type and size of rotary shouldered connection having a 90° thread form
NOTE The number relates to a historical drill-pipe size.
4.2.4
IF style
type and size of the rotary shouldered connection having the V-038R thread form
NOTE 1 The number relates to a historical drill-pipe size.
NOTE 2 The thread form was historically V-065.
4.2.5
number style
NC style
type and size of the rotary shouldered connection having the V-038R thread form
NOTE The number in the connection number is the first two digits of the pitch diameter of the pin thread at the gauge
point, expressed in units of 2,54 mm (0.1 in).
4.2.6
open-hole style
OH style
type and size of rotary shouldered connection having the V-076 thread form
NOTE The number relates to a historical drill-pipe size.
4.2.7
PAC style
type and size of rotary shouldered connection having the V-076 thread form
NOTE The number relates to a historical drill-pipe size.
4.2.8
regular style
REG style
type and size of rotary shouldered connection having thread forms of V-040, V-050 or V-055
NOTE The number relates to a historical drill-pipe size.
4.2.9
SL H90 style
type and size of rotary shouldered connection having a 90° thread form and heavy truncation
NOTE The number relates to a historical drill-pipe size.
ISO 10424-2:2007(E)
4.3 Abbreviations and symbols
4.3.1 Abbreviations
c/bore Counterbore
CW Cold working
dia. Diameter
FF Full face
FH Full-hole (style)
ID Inside diameter
IF Internal-flush (style)
LH Left-hand
LT Low-torque modification
max. Maximum
min. Minimum
NC Numbered-connection (style)
OD Outside diameter
OH Open-hole (style)
ref Reference (dimension)
REG Regular (style)
RH Right-hand
SRG Stress-relief groove
thds Threads
4.3.2 Symbols
A Depth of the pin stress-relief groove below the thread root at the gauge point
B Depth of box stress-relief groove, measured from the pitch cone addendum
C Pitch diameter at working gauge point
GP
C Pitch diameter of thread at gauge point
d Diameter of ball for lead and taper gauges
b
D Diameter of box member at stress-relief groove
BG
d Diameter of ball for thread-height gauge
bh
D Diameter of cylinder of boreback stress-relief contour
CB
D Diameter of face groove and box counterbore in low-torque feature
FG
D Diameter of plug fitting plate
FP
D Large diameter of pin
L
6 © ISO 2007 – All rights reserved

ISO 10424-2:2007(E)
D Diameter of flat on pin
LF
D Major diameter of plug gauge at gauge point
MP
D Minor diameter of ring gauge at gauge point
MR
D Outside diameter of ring gauge
R
D Small diameter of pin
S
D Diameter of pin stress-relief groove
SRG
F Width of crest flat, product thread
c
F Width of root flat, product thread
r
f Crest truncation, product thread
c
f Crest truncation, gauge thread
cg
f Root truncation, product thread
r
f Root truncation, gauge thread
rg
H Reference thread height not truncated
h Product thread height truncated
h Depth of box stress-relief groove, measured normal to taper cone
bg
h Height of product thread, compensated for taper
cn
h Reference gauge thread height truncated
g
L Depth of box
BC
L Length, shoulder face to groove of box member
BG
L Depth of box threads (minimum)
BT
L Length of thread lead multiple, compensated for taper
ct
L Boreback length
CB
L Depth of cylinder of boreback contour
CYL
L Thickness of gauge fitting plate
fp
L Distance from shoulder to first full-depth pin thread
ft
L Distance from shoulder to gauge point
GP
L Total length of plug gauge
pg
L Total length of ring gauge
rg
L Length of pin
PC
L Depth of box counterbore
Qc
L Length of relief groove on pin
SRG
L Length from shoulder to last thread scratch on boreback cylinder
X
n Number of threads in 25,4 mm (1.0 in)
ISO 10424-2:2007(E)
P Pitch of thread (used also for lead, since all threads referenced are single-start)
Q Diameter of ring gauge counterbore
Q Diameter of product box counterbore
c
r Radius at corners of crest flat
c
r Radius at corners of root flat
r
R Root radius, product thread
R Radius at corners of box stress-relief groove
bg
R Radius at corners of low-torque grooves
FG
S Mating stand-off of gauges
S Stand-off of certified reference master gauges
S Stand-off of the working plug gauge on a reference master gauge
S Stand-off of the working ring gauge on a reference master gauge
T Taper, expressed as millimetres of diameter per millimetre of length or inches of diameter per foot
of length
T Thickness of gauge fitting plate
FP
ϕ Half of the included angle of the taper cone
θ Angle between the thread flank and the normal to the thread axis
5 Information to be supplied by purchaser
In placing orders for equipment manufactured with rotary shouldered connections in accordance with this part
of ISO 10424, the purchaser shall specify the following on the purchase order:
⎯ number of this part of ISO 10424;
⎯ thread style and size;
⎯ if necessary, supplementary requirements as detailed in Clause 6, which are optional with the purchaser.
6 Threading
6.1 Thread profile and dimensions
6.1.1 Overall dimensions
Rotary shouldered connections shall be furnished in the sizes and styles shown in Table 1. Dimensions of
rotary shouldered connections shall conform to Tables 1 and 2, and Figures 1 and 2. The taper, T, in Tables 1
and 2, is related to the half-angle, ϕ, in Figures 1 and 2, by T = 2 tanϕ.
The dimensions shown in Tables 1 and 2 that have no specified tolerance and do not have tolerances defined
below shall be considered reference dimensions. Deviations from these dimensions shall not be cause for
rejection. The extent of the bevel of the small end of the pin is optional with the manufacturer.
Right-hand threads shall be considered standard. Left-hand threads conforming to this part of ISO 10424 shall
be acceptable, if certified reference master gauges exist for these threads.
8 © ISO 2007 – All rights reserved

ISO 10424-2:2007(E)
Dimensions in millimetres (inches)

Key
1 taper half-angle, ϕ
2 plane of gauge point
3 connection bevel diameter; see 6.2
4 outside bevel, angle optional to manufacturer
5 optional inside bevel
a
In accordance with ISO 11961 or product specification.
Figure 1 — Pin connection
Key
1 taper half-angle, ϕ
2 chamfer angle, typically 25° to 45°
Figure 2 — Box connection
ISO 10424-2:2007(E)
Table 1 — Product thread dimensions for preferred connections
a
(SI units )
Dimensions in millimetres, unless otherwise specified
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Connection Threads Pitch dia. Large Pin Small Depth of Total Box Depth
Pin
Thread
b
style and per at gauge dia. of cylinder dia. of box box c/bore of box
Taper
c
form
length
size 25,4 mm point pin dia. pin threads depth dia. c/bore
T n C D D D L L L Q L L
L LF S PC BT BC c Qc ft
0 +9 +08, +16,
mm/mm  ref. ± 0,4 ref. min. max.
−3 0 −04, −08,
NC23 V-038R 1/6 4 59,817 0 65,10 61,90 52,40 76,20 79,38 92,08 66,68 15,88 12,70
NC26 V-038R 1/6 4 67,767 2 73,05 69,85 60,35 76,20 79,38 92,08 74,61 15,88 12,70
NC31 V-038R 1/6 4 80,848 2 86,13 82,96 71,31 88,90 92,08 104,78 87,71 15,88 12,70
NC35 V-038R 1/6 4 89,687 4 94,97 92,08 79,09 95,25 98,42 111,12 96,84 15,88 12,70
NC38 V-038R 1/6 4 96,723 2 102,00 98,83 85,07 101,60 104,78 117,48 103,58 15,88 12,70
NC40 V-038R 1/6 4 103,428 8 108,71 105,56 89,66 114,30 117,48 130,18 110,33 15,88 12,70
NC44 V-038R 1/6 4 112,191 8 117,47 114,27 98,42 114,30 117,48 130,18 119,06 15,88 12,70
NC46 V-038R 1/6 4 117,500 4 122,78 119,61 103,73 114,30 117,48 130,18 124,62 15,88 12,70
NC50 V-038R 1/6 4 128,059 2 133,34 130,43 114,29 114,30 117,48 130,18 134,94 15,88 12,70
NC56 V-038R 1/4 4 142,646 4 149,24 144,86 117,49 127,00 130,18 142,88 150,81 15,88 12,70
NC61 V-038R 1/4 4 156,921 2 163,52 159,16 128,59 139,70 142,88 155,58 165,10 15,88 12,70
NC70 V-038R 1/4 4 179,146 2 185,74 181,38 147,64 152,40 155,58 168,28 187,32 15,88 12,70
1 REG V-055 1/8 6 29,311 6 32,54 31,32 27,78 38,10 50,80 53,98 33,04 11,13 10,16
1-1/2 REG V-055 1/8 6 39,141 4 42,37 41,17 36,02 50,80 53,98 66,80 42,88 11,13 10,16
2-3/8 REG V-040 1/4 5 60,080 4 66,68 63,88 47,62 76,20 79,38 92,08 68,26 15,88 12,70
2-7/8 REG V-040 1/4 5 69,605 4 76,20 73,41 53,98 88,90 92,08 104,78 77,79 15,88 12,70
3-1/2 REG V-040 1/4 5 82,292 7 88,89 86,11 65,07 95,25 98,42 111,12 90,49 15,88 12,70
4-1/2 REG V-040 1/4 5 110,867 7 117,46 114,68 90,47 107,95 111,12 123,82 119,06 15,88 12,70
5-1/2 REG V-050 1/4 4 132,944 1 140,20 137,41 110,03 120,65 123,82 136,52 141,68 15,88 12,70
6-5/8 REG V-050 1/6 4 146,248 1 152,19 149,40 131,02 127,00 130,18 142,88 153,99 15,88 12,70
7-5/8 REG V-050 1/4 4 170,549 1 177,80 175,01 144,46 133,35 136,52 149,22 180,18 15,88 12,70
8-5/8 REG V-050 1/4 4 194,731 1 201,98 199,14 167,85 136,53 139,70 152,40 204,39 15,88 12,70
5 1/2 FH V-050 1/6 4 142,011 4 147,95 145,16 126,78 127,00 130,18 142,88 150,02 15,88 12,70
6-5/8 FH V-050 1/6 4 165,597 8 171,53 168,73 150,37 127,00 130,18 142,88 173,83 15,88 12,70
a
See Table A.1 for USC units.
b
Taper, T: 1/6 mm/mm corresponds to a half-angle of ϕ = 4,764°.
1/4 mm/mm corresponds to a half-angle of ϕ = 7,125°.
1/8 mm/mm corresponds to a half-angle of ϕ = 3,576°.
c
For roller cone drill bits only, the pin length may vary by −5 mm.

6.1.2 Shoulder contact face
Shoulder contact faces of rotary shouldered connections shall be plane, and square with the thread axis,
within 0,05 mm (0.002 in).
6.1.3 Stand-off
Rotary shouldered connections shall be produced with stand-off tolerances as specified in Clause 8.
10 © ISO 2007 – All rights reserved

ISO 10424-2:2007(E)
6.1.4 Thread axis
Thread axes of rotary shouldered connections, except on bits, shall not deviate from the design axes of the
product by an angle greater than 0,057° [0,001 mm/mm (0.001 in/in) of projected axis]. The design axis shall
be assumed to intersect the thread axis at the plane of the joint shoulder.
6.1.5 Lead tolerance
The lead tolerance of rotary shouldered connections shall be as follows:
a) ± 0,038 mm per 25,4 mm (0.001 5 in per in) for any 25,4 mm (1.0 in) between first and last full depth
threads;
b) ± 0,114 mm (0.004 5 in) between first and last full depth threads, or the sum of 0,025 4 mm (0.001 in) for
each 25,4 mm (1 in) between first and last full depth threads, whichever is greater.
Clause 8 describes the method for determining lead.
6.1.6 Taper tolerance
The taper tolerance of rotary shouldered connections shall be as follows:
a) pin thread: +0,002 5 mm/mm to 0 mm/mm (0.030 in/ft to 0 in/ft) average taper between first and last
full depth threads;
b) box thread: 0 mm/mm to −0,002 5 mm/mm (0 in/ft to −0.030 in/ft) average taper between first and last
full depth threads.
Methods for determining taper are described in 8.5.
6.1.7 Thread form
The thread form shall be as defined in Table 2, and shown in Figures 3 and 4.
Table 2 — Product thread form dimensions
a
(SI units )
Dimensions in millimetres, unless otherwise specified
1 2 3 4 5 6 7 8
Thread form V-038R V-038R V-040 V-050 V-050 V-055
Threads per 25,4 mm n 4 4 5 4 4 6
Lead, ref 6,35 6,35 5,08 6,35 6,35 4,233 33
Half angle θ, deg ± 0,75 30 30 30 30 30 30
Taper T, mm/mm 1/6 1/4 1/4 1/6 1/4 1/8
Crest flat width F, ref. 1,65 1,65 1,02 1,27 1,27 1,40
c
Root radius R 0,97 0,97 0,51 0,64 0,64 N/A
Root flat width F , ref. N/A N/A N/A N/A N/A 1,19
r
Root flat corner radius r ± 0,2 N/A N/A N/A N/A N/A 0,38
r
Thread height, not
H, ref. 5,486 53 5,470 62 4,376 50 5,486 53 5,470 62 3,661 40
truncated
Crest truncation f 1,426 50 1,422 36 0,875 31 1,097 31 1,094 12 1,208 26
c
Root truncation f 0,965 20 0,965 20 0,508 00 0,635 00 0,635 00 1,032 51
r
+0,025
Thread height truncated h 3,094 83 3,083 06 2,993 19 3,754 22 3,74150 1,420 63
−0,076
Crest flat corner radius r ± 0,2 0,38 0,38 0,38 0,38 0,38 0,38
c
NOTE See Figures 4 and 5 for meaning of dimensions.
a
See Table A.2 for values in USC units.
ISO 10424-2:2007(E)
a)  V-038R
Key
1 taper half-angle, ϕ
Figure 3 — Product thread forms
12 © ISO 2007 – All rights reserved

ISO 10424-2:2007(E)
b)  V-050, V-040
Key
1 taper half-angle, ϕ
Figure 3 (continued)
ISO 10424-2:2007(E)
Key
1 taper half-angle, ϕ
Figure 4 — Product thread form V-055
6.1.8 Pin base diameter
Pin base diameter dimensional requirements shall be as follows.
a) Rotary shouldered connections on drill collars shall have a cylindrical region at the base conforming to the
dimension D of Table 1, and shall have a 1,6 mm ± 0,4 mm (0.062 in ± 0.015 in) radius at the pin base
LF
as shown in Figure 5, except when a stress-relief groove is used.
b) Rotary shouldered connections on products other than drill collars may have a tapered region at the pin
base rather than a cylindrical region. When the tapered base is used, the radius at the intersection of the
taper and the sealing face shall be equal to or greater than 0,8 mm (0.03 in), as shown in Figure 5.
c) The distance between the pin shoulder and the intersection of the pin base diameter with the thread flank
at the first point of full thread depth shall not exceed L (see Figure 6 and Table 1).

ft
14 © ISO 2007 – All rights reserved

ISO 10424-2:2007(E)
Dimensions in millimetres (inches)

Key
1 taper half-angle, ϕ
Figure 5 — Pin base cylinder
Key
1 first point of full thread depth
Figure 6 — First point of full thread depth
6.1.9 Box counterbore
The box counterbore shall have the diameter, Q , specified in Table 1, and taper, T, as described in 6.1.1 and
C
shown in the detail of Figure 2. The depth of the counterbore shall be L , as specified in Table 1. The angle
Qc
of the bevel at the intersection of the counterbore and the first threads is optional to the manufacturer and is
typically 25° to 45°.
6.2 Bevels for drill collars and tools that mate directly with drill collars
Bevel diameters on drill collars and tools that mate with them are based on a computation described in detail
in Annex I, which depends on the outside diameter at the connection. The bevel diameter for the smallest
diameter commonly used, the reference diameter, is listed in Table 3. The bevel diameter is re-calculated for
every 6,4 mm (0.25 in) increase in outside diameter of the drill collar. For every 6,4 mm (0.25 in) increase (or
decrease) in outside diameter, the bevel diameter is also increased (or decreased) by 4,8 mm (0.19 in).
ISO 10424-2:2007(E)
Bevel diameters for low-torque features have been arbitrarily set and shall not increase with diameter
changes.
Unless otherwise specified, bevel tolerances shall be ± 0,4 mm (± 0.015 in).
These bevel diameters shall not apply to products that have specific requirements in API Spec 7 and
ISO 10424-1, tool joints, bits or boxes that mate with bits.
Table 3 — Reference bevel diameters for 60° included thread angle connections
when used on drill collars
a
(SI units )
Dimensions in millimetres
1 2 3 4 5 6 7 8 9
Connection Reference Connection Reference Connection Reference
Reference Reference Reference
size and bevel size and bevel size and bevel
b b b
OD OD OD
style diameter style diameter style diameter
NC23 79,38 76,20 NC50 161,92 155,18 51/2 REG 165,10 159,54
NC26 85,72 82,95 NC56 190,50 180,58 65/8 REG 190,50 181,37
NC31 104,78 100,41 NC61 209,55 198,44 75/8 REG 219,08 209,55
NC35 120,65 114,70 NC70 241,30 227,81 75/8 REG LT 244,48 234,95
NC38 120,65 116,28 23/8 REG 79,38 76,60 85/8 REG FF 241,30 232,17
NC40 133,35 127,40 27/8 REG 98,42 90,88 85/8 REG LT 269,88 266,70
NC44 146,05 139,70 31/2 REG 107,95 103,58 51/2 FH 171,45 165,89
NC46 152,40 145,26 41/2 REG 139,70 134,54 65/8 FH 203,20 195,66
NOTE These bevel diameters do not apply to tool joints, bits or boxes that mate with bits.
a
See Table A.3 for USC units.
b
See 6.2 for OD larger than the reference OD.

6.3 Low-torque feature
Several connections in larger sizes shall have modified bevel diameters and enlarged face counterbores when
used on products with a large outside diameter. This allows the make-up torque to achieve adequate
compressive stress on the sealing face while maintaining bending stiffness. These features are shown in
Figure 7, and dimensions in Table 4. These features shall be mandatory above the product diameter
indicated.
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ISO 10424-2:2007(E)
Dimensions in millimetres (inches), unless otherwise specified

a)  Pin with SRG b)  Pin without SRG

c)  Low-torque box
Key
1 taper
Figure 7 — Low-torque feature for certain connections with ODs larger than 241 mm (9.5 in)

ISO 10424-2:2007(E)
Table 4 — Low-torque feature
a
(SI units )
Dimensions in millimetres
1 2 3 4
Face groove diameter Face groove radius
Connection size and style Required above OD
+ 0,8 0
D R
FG −0,4 FG −0,4
7-5/8 REG 241,3 196,9 6,35
8-5/8 REG 266,7 228,6 6,35
NOTE See Figure 7.
a
See Table A.4 for USC units.
7 Product optional features
7.1 General
The requirements given in 7.2 to 7.6 apply only if stated on the purchase order.
7.2 Stress-relief features
If fatigue failures in connections can be a problem, stress-relief features may be specified. Stress-relief
features are of two basic designs: a groove on the pin and a boreback contour for boxes or a groove on both
the pins and boxes. The boreback stress-relief contour is the recommended design for the box connection.
However, the box relief groove also has been shown to provide beneficial effects.
These features are shown in Figures 8 through 10. The dimensions for connections not listed here may be
calculated according to the equations in Annex I. Stress-relief grooves at the pin shoulder and stress-relief
grooves or borebacks at the base of the box thread shall conform to the dimensions shown in Table 5.
Stress-relief grooves are not recommended for use on pin threads with pitch diameter, C, at gauge point
smaller than 89 mm (3.5 in).
The boreback contour is not recommended for use on threads with pin length, L , smaller than 89 mm
PC
(3.5 in).
Stress-relief grooves on pins cause a slight reduction in the tensile strength and section modulus of the
connection. However, under most conditions this reduction in cross-sectional area is more than offset by the
reduction in fatigue failures. If unusually high loads are expected, calculations of the effect should be made.
18 © ISO 2007 – All rights reserved

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