ISO/WD 7689

Aerospace — Bolts, with MJ threads, made of alloy steel, strength class 1 100 MPa — Procurement specification

Aéronautique et espace — Vis à filetages MJ, en acier allié, de classe de résistance 1 100 MPa — Spécification d'approvisionnement

General Information

• Status: Not Published
• ICS: 49.030.20 - Bolts, screws, studs
• Technical Committee: ISO/TC 20/SC 4 - Aerospace fastener systems
• Drafting Committee: ISO/TC 20/SC 4/WG 3 - Supporting documents
• Current Stage: 2099 - WD approved for registration as CD
• Completion Date: 31-Oct-2022

Relations

• Revises: ISO 7689:2008 - Aerospace — Bolts, with MJ threads, made of alloy steel, strength class 1 100 MPa — Procurement specification
• Effective Date: 23-Apr-2020

Standards Content (Sample)

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Formatted: Font: 12 pt, Bold
ISO/TC 20/SC 4
Date:  2020-02-20
ISO/DIS 7689.2:2020(E)
ISO/TC 20/SC 4/WG
ISO/TC 20/SC 4
ISO/FDIS 7689.2:2022(E)
ISO/TC 20/SC 4/WG
Secretariat:  ANSI DIN
Aerospace — Bolts, with MJ threads, made of alloy steel, strength class
1 100 MPa — Procurement specification
Aéronautique et espace — Vis à filetages MJ, en acier allié, de classe de résistance 1 100 MPa —
Spécification d'approvisionnement
Aerospace series — Bolts, with MJ threads, made of alloy steel, strength class
1 100 MPa — Procurement specification
Aéronautique et espace — Vis à filetages MJ, en acier allié, de classe de résistance
1 100 MPa — Spécification d'approvisionnement
Formatted: English (United Kingdom)
Document type:  Erreur ! Source du renvoi introuvable.
Document subtype:  Erreur ! Source du renvoi introuvable.
Document stage:  Erreur ! Source du renvoi introuvable.
Document language:  Erreur ! Source du renvoi introuvable.

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COPYRIGHT PROTECTED DOCUMENT
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or
utilized otherwise in any form or by any means, electronic or mechanical, including photocopying,
or posting on the internet or an intranet, without prior written permission. Permission can be
requested from either ISO at the address below or ISO’s member body in the country of the
requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland Formatted: English (United Kingdom)
Tel.  + 41 22 749 01 11
Fax  + 41 22 749 09 47
[e-mail]
www.iso.org
Formatted: English (United Kingdom)
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Contents Page
Foreword . iv Formatted: Font: Bold
Formatted: TOC 1, Indent: First line: 0 cm, Tab stops: Not
1 Scope .1
at 1.27 cm
2 Normative references .1
3 Terms and definitions .2
4 Quality assurance .4
4.1 General .4
4.2 Qualification inspection conditions .4
4.3 Acceptance inspection conditions .4
4.4 Use of „statistical process control (SPC)” .5
5 Requirements .5
Annex A (informative) Cross sectional areas and formulae for tensile loads . 21
A.1 Cross-sectional area values . 21
A.2 Formulae . 21
A.2.1 Cross-sectional area . 21
A.2.2 Tensile test load . 22
Annex B (informative) Cross sectional areas and formulae for double shear loads . 23
B.1 Cross-sectional area values (single section) . 23
B.2 Formulae . 23
B.2.1 Shear strength cross-sectional area, A (single section) . 23
s
B.2.2 Double shear strength test load . 24

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iii

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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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Formatted: Hyperlink, English (United States)
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. Details of any
patent rights identified during the development of the document will be in the Introduction and/or on
the ISO list of patent declarations received (see www.iso.org/patents).
Formatted: Hyperlink, English (United States)
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the World
Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
Formatted: Hyperlink, English (United States)
This document was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles,
Subcommittee SC 4, Aerospace fastener systems.
This third edition cancels and replaces the second edition (ISO 7689:2008), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— additional requirements in 5.2 "Dimensions";
— additional requirements in 5.4.1 "Tensile strength"
— additional values in Table 5 "Minimum loads for tensile and double shear tests" for protruding head.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html. Formatted: Hyperlink, English (United States)
Formatted: English (United Kingdom)
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iv

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Erreur ! Source du renvoi introuvable.FINAL DRAFT Erreur ! Source du renvoi
INTERNATIONAL STANDARD introuvable.ISO/FDIS 7689.2:2022(E)
Formatted: Font: Bold
Formatted: Font: Bold

Formatted: English (United Kingdom)
Aerospace series — Bolts, with MJ threads, made of alloy steel,
strength class 1 100 MPa — Procurement specification
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1

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Aerospace series — Bolts, with MJ threads, made of alloy steel,
strength class 1 100 MPa — Procurement specification
1 Scope
This document specifies the characteristics and quality assurance requirements for MJ thread bolts made
of alloy steel, of strength class 1 100 MPa, for aerospace construction.
It is applicable whenever it is referenced in a definition document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 4288, Geometrical Product Specifications (GPS) — Surface texture: Profile method — Rules and
procedures for the assessment of surface texture
ISO 21920-3, Geometrical product specifications (GPS) — Surface texture: Profile — Part 3:
Specification operators
ISO 5855-2, Aerospace — MJ threads — Part 2: Limit dimensions for bolts and nuts
ISO 6506-1, Metallic materials — Brinell hardness test — Part 1: Test method
ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method
ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method
ISO 7961, Aerospace — Bolts — Test methods
ISO 8258, Shewhart control charts
Formatted: Don't keep with next, Adjust space between
3 Terms and definitions
Latin and Asian text, Adjust space between Asian text and
numbers
For the purposes of this document, the following terms and definitions apply.
Formatted: English (United States)
ISO and IEC maintain terminologicalterminology databases for use in standardization at the following
Formatted: English (United States)
addresses:
Formatted: Font: Times New Roman, 12 pt, English
(United States)
— ISO Online browsing platform: available at http://www.iso.org/obphttps://www.iso.org/obp
Formatted: English (United States)
— IEC Electropedia: available at http://www.electropedia.org/https://www.electropedia.org/
Formatted: Hyperlink, English (United States)
Formatted: Adjust space between Latin and Asian text,
3.1
Adjust space between Asian text and numbers, Tab stops:
production batch
Not at 0.7 cm + 1.4 cm + 2.1 cm + 2.8 cm + 3.5 cm + 4.2
quantity of finished bolts, manufactured using the same process, from a single material cast (single heat
cm + 4.9 cm + 5.6 cm + 6.3 cm + 7 cm
of alloy), having the same number of definition document (3.3), same thread and diameter code, heat
Formatted: English (United States)
treated together to the same specified condition and produced as one continuous run
Formatted: Hyperlink, English (United States)
Formatted: cite_sec
3.2
inspection lot
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quantity of bolts from a single production batch (3.1) having the same number of definition document (3.3)
Formatted: cite_sec
Formatted: cite_sec
3.3
definition document
document specifying directly or indirectly all the requirements for bolts
Note 1 to entry: The definition document can be an International Standard, an in-house standard or a drawing.
3.4
crack
rupture in the material which may extend in any direction and which may be intercrystalline or
transcrystalline in character
3.5
seam
open surface defect
3.6
lap
surface defect caused by folding over metal fins or sharp corners and then rolling or forging them into
the surface
3.7
crevice
hollow area at thread crest
3.8
inclusions
non-metallic particles originating from the material manufacturing process
Note 1 to entry: These particles can be isolated or arranged in strings.
3.9
sampling plan
plan according to which one or more samples are taken in order to obtain information and possibly to
Formatted: Don't keep with next
reach a decision
Note 1 to entry: In this document, each sampling plan specifies the number of bolts to be inspected as a function
of the size of the batch and the acceptance number [number of defective items acceptable (Ac)]. See ISO 2859-1.
Formatted: std_publisher
Formatted: std_docNumber
3.10
Formatted: std_docPartNumber
simple random sampling
sampling of n items from a population of N items in such a way that all possible combinations of n items
have the same probability of being chosen
3.11
critical defect
defect that, according to judgement and experience, is likely to result in hazardous or unsafe conditions
for individuals using, maintaining or depending upon the considered product (bolt), or that is likely to
prevent performance of the function of a major end item
3.12
major defect
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defect, other than critical, that is likely to result in a failure or to reduce materially the usability of the
considered product (bolt) for its intended purpose
3.13
minor defect
defect that is not likely to reduce materially the usability of the considered product (bolt) for its intended
purpose, or that is a departure from the established specification having little bearing on the effective use
or operation of this product
3.14
limiting quality
LQ
quality limit that corresponds to a specified and relatively low probability of Formatted: cite_sec
acceptance
Note 1 to entry: It is the limiting lot quality characteristic that the consumer is willing to accept with a low
probability that a lot of this quality would occur.
Note 2 to entry: For the purposes of this document, the limiting quality quoted in Table 4 corresponds to a
probability of acceptance of 10 %.
3.15
acceptable quality limit
AQL
maximum percent defective (or maximum number of defects per hundred units) that, for purposes of
sampling inspection, can be considered satisfactory as a process average
Note 1 to entry: Variant: quality limit which in a sampling plan (3.9) corresponds to a specified but relatively high
Formatted: cite_sec
probability of acceptance.
4 Quality assurance
4.1 General
The manufacturer shall be capable of continuous production of bolts complying with the quality
requirements specified in this document. It is recommended that the manufacturer be certified to a
recognized quality management system. The certification authority may be the prime contractor.
1
The purpose of qualification inspections of bolts is to check that the design and manufacturing
conditions of a bolt allow it to satisfy the requirements of this document.
NOTE In order to simplify the text the term "inspections" used in this document also refers to "inspections and
tests".
Quality documentation for parts produced in accordance to this document shall be maintained for a
minimum period of 10 years.
Qualification of the bolts shall be granted by the certification authorities in the purchaser's country, or
their appointed representative, who may be the prime contractor.

1
In order to simplify the text the term "inspections" used in this document also refers to "inspections and tests".
Formatted: English (United Kingdom)
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The purpose of production acceptance inspection of a bolt is to check, as simply as possible, using a
method which is inexpensive but the most representative of the actual conditions of use, with the
uncertainty inherent in statistical sampling, that the bolts satisfy the requirements of this document.
Production acceptance inspections shall be carried out by the manufacturer, or under his responsibility.
4.2 Qualification inspection conditions
Unless otherwise specified, the inspection shall be carried out on:
— each type and diameter of bolt;
— 25 bolts selected from a single inspection lot by simple random sampling.
The test programme may possibly be reduced, or the qualification granted without inspection; any such
decision shall be based on the results obtained on similar types and diameters of bolt provided that the
design and manufacturing conditions are identical.
The inspections shall be repeated on any bolt if the manufacturing conditions have been modified.
Table 2 indicates the allocation of bolt samples for the inspections.
4.3 Acceptance inspection conditions
Inspections shall be carried out on each production batch or inspection lot. Bolts from the batch or lot to
be inspected shall be selected by simple random sampling.
Each bolt may be submitted to several inspections, provided that none of the characteristics to be verified
has been previously altered during any of these inspections.
The bolts to be subjected to destructive inspections may be those on which non-destructive inspections
have been carried out.
If a more stringent inspection is deemed necessary, all or part of the qualification inspections may be
performed during the acceptance inspections. In this case, the number of bolts submitted is the same as
that submitted for qualification inspection.
Production batches or inspection lots declared unacceptable after the production acceptance inspections
shall be submitted for re-inspection only after all the defective units have been removed and/or defects
have been corrected. In this case, the attribute(s) that caused the rejection shall be verified using a sample
of twice the normal size but with the same number of acceptable defective items.
4.4 Use of "statistical process control (SPC)"
When a characteristic is obtained by a controlled statistical process, in order to declare conformity of the
characteristic, the manufacturer has the possibility of refraining from the final systematic sampling
provided for in this document if he/she isthey are capable of formally justifying this choice by using
ISO/TR 13425 and the standards quoted in it as a basis.
This justification includes the following phases:
— analysis of the key characteristics of the product;
— analysis of the risks for each implemented process;
— determination of the parameters and/or characteristics to be respected under SPC;
— determination of the capabilities of each process;
— drawing up of an inspection plan and integration in the manufacturing process;
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— drawing up of routes and control charts (ISO 79667870-3, ISO 7870-1, ISO 8258);
— use of control charts for data consolidation;
— determination of the audits to be run and the control to be carried out to ensure reliability of the
device.
To be usable in production, this process shall or should be validated beforehand by the qualifying body,
either during the qualification phase or a posteriori, according to the case, by analysing the justificatory Formatted: Font: Not Italic
file and the results of the qualification inspections such as provided for in Clause 5. Such an SPC process
is not applicable to destructive tests.
5 Requirements
Formatted: Don't adjust space between Latin and Asian
The requirements in Table 1, unless otherwise specified, shall apply to bolts ready for use. The test
text, Don't adjust space between Asian text and numbers
temperature, unless otherwise specified, shall be the ambient temperature. These requirements
Formatted Table
complement the requirements of all other standards or specifications referenced in the definition
Formatted: Font: Bold
document.
Formatted: Font: Bold
Table 1 — Requirements and test methods
Formatted: Font: Bold
Designa Formatted: Font: Bold
No of Characteristi Inspection and test Sample
Requirement
a
subclause. c method size
tion
Formatted: Font: Bold
Formatted: Don't adjust space between Latin and Asian
5.-1  Material In accordance with the See material standard.  As
text, Don't adjust space between Asian text and numbers
definition document. required
by
Formatted: Don't adjust space between Latin and Asian
semifinishe text, Don't adjust space between Asian text and numbers
d product
Formatted Table
5.-2  Dimensions In accordance with the Standard gauging. Q 20
Formatted: Don't adjust space between Latin and Asian
definition document. text, Don't adjust space between Asian text and numbers
ISO 5855-2 shall
A See Table 3
Dimensions shall include the apply.
Formatted: Default Paragraph Font
and Table 4
chemical applied or
Formatted: Default Paragraph Font
electroplated finishes
Formatted: Don't adjust space between Latin and Asian
designated on the detailed
text, Don't adjust space between Asian text and numbers
drawing. Dimensions shall
exclude paint and similar
Formatted: Default Paragraph Font
coating, metallic dips and dry
Formatted: Don't adjust space between Latin and Asian
film lubricants.
text, Don't adjust space between Asian text and numbers
5.-3  Manufacturin
Formatted: Don't adjust space between Latin and Asian
g
text, Don't adjust space between Asian text and numbers
Formatted: Don't adjust space between Latin and Asian
 5.- Forging The heads of the bolts shall be According to the Q
text, Don't adjust space between Asian text and numbers
3.-1 formed by a hot or cold forging route of manufacture.

process before heat treatment.
Formatted: Don't adjust space between Latin and Asian
text, Don't adjust space between Asian text and numbers
In the case of hot forging, the The equipment used
Formatted: Don't adjust space between Latin and Asian
equipment shall ensure an shall be approved.
text, Don't adjust space between Asian text and numbers
adequate and uniform
temperature throughout the Formatted: Don't adjust space between Latin and Asian
production batch. text, Don't adjust space between Asian text and numbers
Formatted: Don't adjust space between Latin and Asian
 5.- Heat The forged blanks shall be heat- According to the Q
text, Don't adjust space between Asian text and numbers
3.-2 treatment treated to produce the process route.

properties required by the Formatted: Don't adjust space between Latin and Asian
The equipment used
text, Don't adjust space between Asian text and numbers
definition document. Blanks
shall be approved.
Formatted: English (United Kingdom)
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6

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shall not be heat-treated more
than twice.
 5.- Removal of If machining is required, it is
Formatted: Don't adjust space between Latin and Asian
3.-3 surface necessary to respect the text, Don't adjust space between Asian text and numbers
contaminatio requirements of 5.-5.-1.
n (bearing
face and
shank)
 5.- Threads Formed by a single rolling According to the Q
Formatted: Don't adjust space between Latin and Asian
3.-4 process after full heat manufacturing route. text, Don't adjust space between Asian text and numbers

treatment.
Formatted: Don't adjust space between Latin and Asian
text, Don't adjust space between Asian text and numbers
 5._3. Surface In accordance with the Q 5
ISO 4288 21920-3
-5 roughness definition document. Formatted: Don't adjust space between Latin and Asian
shall apply.
A See Table 3
text, Don't adjust space between Asian text and numbers
Visual examination.
and Table 4
Formatted Table
 5.- Surface In accordance with the See surface coating Q 5
Formatted: Default Paragraph Font
3.-6 coating definition document. standard.
A See Table 3
Formatted: Don't adjust space between Latin and Asian
and Table 4
text, Don't adjust space between Asian text and numbers
5.-4  Mechanical     Formatted: Default Paragraph Font
properties
Formatted: Don't adjust space between Latin and Asian
text, Don't adjust space between Asian text and numbers
 5-4- Tensile See Table 5. On bolts: ISO 7961 Q 5
1 strength shall apply.
Formatted: Don't adjust space between Latin and Asian
text, Don't adjust space between Asian text and numbers
  The requirements apply on A for Table 6 or
Formatted: Don't adjust space between Latin and Asian
bolts except on the following: bolts, Table 7
text, Don't adjust space between Asian text and numbers
not for
specime
Formatted: Default Paragraph Font
ns
Formatted: Don't adjust space between Latin and Asian
a) protruding head bolts of
text, Don't adjust space between Asian text and numbers

grip length < twice the
nominal shank diameter;
b) countersunk head bolts of

grip length < two and a half
times the nominal shank
diameter;
c) threaded to head bolts of

overall length < three times
the nominal thread
diameter or bolts having an
overall length < 18 mm;
 5.4. Tensile See Table 5. On bolts: ISO 7961 Q 5
Split Cells
1 strength shall apply.
The requirements apply on
Split Cells
bolts except on the following:
Split Cells
a) protruding head bolts of
Split Cells
grip length < twice the nominal
shank diameter; Split Cells
b) countersunk head bolts of
Formatted: Left
grip length < two and a half
times the nominal shank
diameter;
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7

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c) threaded to head bolts of
overall length < three times the
nominal thread diameter or
bolts having an overall length
< 18 mm;
d) bolts with a thread
length < one and a half times
the thread nominal diameter
(thread length including
imperfect threads);
e) bolts with a nominal
diameter < 4 mm.
f) Full threaded fasteners
with both a recess drive and
drilled lockwire holes in the
head.;
g) Fasteners with drilled
Formatted: List Number 1 (-), Don't adjust space
threads. User should be between Latin and Asian text, Don't adjust space between
Asian text and numbers, Tab stops: 0.7 cm, Left + 1.4 cm,
aware that fasteners with
Left + 2.1 cm, Left + 2.8 cm, Left + 3.5 cm, Left + 4.2 cm,
holes drilled in the thread
Left + 4.9 cm, Left + 5.6 cm, Left + 6.3 cm, Left + 7 cm,
area for lock wire or other
applications may exhibit a
reduction in tensile value.
e) bolts with a nominal

diameter < 4 mm.
f) Full threaded fasteners

with both a recess drive and
drilled lockwire holes in the
head.;
g) Fasteners with drilled
Split Cells
  A Table 6 or
threads. User should be
Table 7
Formatted: List Number 1 (-), Don't adjust space
aware that fasteners with
between Latin and Asian text, Don't adjust space between
holes drilled in the thread
Asian text and numbers, Tab stops: 0.7 cm, Left + 1.4 cm,
area for lock wire or other
Left + 2.1 cm, Left + 2.8 cm, Left + 3.5 cm, Left + 4.2 cm,
applications may exhibit a
Left + 4.9 cm, Left + 5.6 cm, Left + 6.3 cm, Left + 7 cm,
reduction in tensile value.
Split Cells
Split Cells
 5.- Double shear See Table 5. ISO 7961 shall apply. Q 5
Split Cells
4.-2 strength
The requirements apply on
Split Cells
bolts except on the following:
a) protruding head bolts of Formatted: Left
grip length < twice the nominal
Formatted: Don't adjust space between Latin and Asian
shank diameter;
text, Don't adjust space between Asian text and numbers
b) countersunk head bolts of
Formatted Table
grip length < two and a half
Formatted: Default Paragraph Font
times the nominal shank
diameter;
c) bolts with a nominal
diameter < 4 mm;
d) threaded to head bolts.
e) Oversize fastener shear tests
may be performed using a test
Formatted: English (United Kingdom)
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specimen or by modifying the
shear dies.


Formatted: Don't adjust space between Latin and Asian
text, Don't adjust space between Asian text and numbers
a) protruding head bolts of A See Table 6
grip length < twice the or
Formatted: List Number 1 (-), Don't adjust space
nominal shank diameter; Table between Latin and Asian text, Don't adjust space between
Asian text and numbers, Tab stops: 0.7 cm, Left + 1.4 cm,
7
Left + 2.1 cm, Left + 2.8 cm, Left + 3.5 cm, Left + 4.2 cm,
Left + 4.9 cm, Left + 5.6 cm, Left + 6.3 cm, Left + 7 cm,
5.4. Fatigue ISO 7961 shall apply
b) countersunk head bolts of Q 5
Formatted: Default Paragraph Font
3
grip length < two and a half
A See table 8
times the nominal shank Merged Cells
diameter;Fasteners shall meet
Merged Cells
the test cycle requirements per
Formatted: List Number 1 (-), Tab stops: 0.7 cm, Left +
TABLE 9 when subjected to the
1.4 cm, Left + 2.1 cm, Left + 2.8 cm, Left + 3.5 cm, Left +
loads per TABLE 8
4.2 cm, Left + 4.9 cm, Left + 5.6 cm, Left + 6.3 cm, Left +
7 cm, Left
Unless otherwise specified by
purchase order or part
Merged Cells
standard, fatigue tests shall not
Merged Cells
apply to parts with:
Formatted: Left
a).  No rolled fillet.
Formatted: Left
b). Thread size smaller than 5
mm
c). Drilled thread.
d). Drilled heads.
e). Metal removed for locking
element.
f). Reduced flush head
configurations.
g). Full threaded parts
(th
...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 7689
ISO/TC 20/SC 4
Aerospace — Bolts, with MJ threads,
Secretariat: DIN
made of alloy steel, strength class 1
Voting begins on:
2022-06-07 100 MPa — Procurement specification
Voting terminates on:
Aéronautique et espace — Vis à filetages MJ, en acier allié, de classe
2022-08-02
de résistance 1 100 MPa — Spécification d'approvisionnement
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 7689:2022(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. © ISO 2022

---------------------- Page: 1 ----------------------
ISO/FDIS 7689:2022(E)
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 7689
ISO/TC 20/SC 4
Aerospace — Bolts, with MJ threads,
Secretariat: DIN
made of alloy steel, strength class 1
Voting begins on:
100 MPa — Procurement specification
Voting terminates on:
Aéronautique et espace — Vis à filetages MJ, en acier allié, de classe
de résistance 1 100 MPa — Spécification d'approvisionnement
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
RECIPIENTS OF THIS DRAFT ARE INVITED TO
ISO copyright office
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
CP 401 • Ch. de Blandonnet 8
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
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ISO/FDIS 7689:2022(E)
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NATIONAL REGULATIONS. © ISO 2022

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ISO/FDIS 7689:2022(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Quality assurance . 3
4.1 General . 3
4.2 Qualification inspection conditions . . 3
4.3 Acceptance inspection conditions . 4
4.4 Use of "statistical process control (SPC)" . 4
5 Requirements . 4
Annex A (informative) Cross sectional areas and formulae for tensile loads .18
Annex B (informative) Cross sectional areas and formulae for double shear loads .20
Bibliography .21
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ISO/FDIS 7689:2022(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 non­governmental, 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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles,
Subcommittee SC 4, Aerospace fastener systems.
This third edition cancels and replaces the second edition (ISO 7689:2008), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— additional requirements in 5.2 "Dimensions";
— additional requirements in 5.4.1 "Tensile strength"
— additional values in Table 5 "Minimum loads for tensile and double shear tests" for protruding head.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
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FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 7689:2022(E)
Aerospace — Bolts, with MJ threads, made of alloy steel,
strength class 1 100 MPa — Procurement specification
1 Scope
This document specifies the characteristics and quality assurance requirements for MJ thread bolts
made of alloy steel, of strength class 1 100 MPa, for aerospace construction.
It is applicable whenever it is referenced in a definition document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 21920-3, Geometrical product specifications (GPS) — Surface texture: Profile — Part 3: Specification
operators
ISO 5855-2, Aerospace — MJ threads — Part 2: Limit dimensions for bolts and nuts
ISO 6506-1, Metallic materials — Brinell hardness test — Part 1: Test method
ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method
ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method
ISO 7961, Aerospace — Bolts — Test methods
ISO 8258, Shewhart control charts
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
production batch
quantity of finished bolts, manufactured using the same process, from a single material cast (single
heat of alloy), having the same number of definition document (3.3), same thread and diameter code,
heat treated together to the same specified condition and produced as one continuous run
3.2
inspection lot
quantity of bolts from a single production batch (3.1) having the same number of definition document
(3.3)
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ISO/FDIS 7689:2022(E)
3.3
definition document
document specifying directly or indirectly all the requirements for bolts
Note 1 to entry: The definition document can be an International Standard, an in-house standard or a drawing.
3.4
crack
rupture in the material which may extend in any direction and which may be intercrystalline or
transcrystalline in character
3.5
seam
open surface defect
3.6
lap
surface defect caused by folding over metal fins or sharp corners and then rolling or forging them into
the surface
3.7
crevice
hollow area at thread crest
3.8
inclusions
non­metallic particles originating from the material manufacturing process
Note 1 to entry: These particles can be isolated or arranged in strings.
3.9
sampling plan
plan according to which one or more samples are taken in order to obtain information and possibly to
reach a decision
Note 1 to entry: In this document, each sampling plan specifies the number of bolts to be inspected as a function
of the size of the batch and the acceptance number [number of defective items acceptable (Ac)]. See ISO 2859-1.
3.10
simple random sampling
sampling of n items from a population of N items in such a way that all possible combinations of n items
have the same probability of being chosen
3.11
critical defect
defect that, according to judgement and experience, is likely to result in hazardous or unsafe conditions
for individuals using, maintaining or depending upon the considered product (bolt), or that is likely to
prevent performance of the function of a major end item
3.12
major defect
defect, other than critical, that is likely to result in a failure or to reduce materially the usability of the
considered product (bolt) for its intended purpose
3.13
minor defect
defect that is not likely to reduce materially the usability of the considered product (bolt) for its
intended purpose, or that is a departure from the established specification having little bearing on the
effective use or operation of this product
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ISO/FDIS 7689:2022(E)
3.14
limiting quality
LQ
quality limit that corresponds to a specified and relatively low probability of
acceptance
Note 1 to entry: It is the limiting lot quality characteristic that the consumer is willing to accept with a low
probability that a lot of this quality would occur.
Note 2 to entry: For the purposes of this document, the limiting quality quoted in Table 4 corresponds to a
probability of acceptance of 10 %.
3.15
acceptable quality limit
AQL
maximum percent defective (or maximum number of defects per hundred units) that, for purposes of
sampling inspection, can be considered satisfactory as a process average
Note 1 to entry: Variant: quality limit which in a sampling plan (3.9) corresponds to a specified but relatively high
probability of acceptance.
4 Quality assurance
4.1 General
The manufacturer shall be capable of continuous production of bolts complying with the quality
requirements specified in this document. It is recommended that the manufacturer be certified to a
recognized quality management system. The certification authority may be the prime contractor.
The purpose of qualification inspections of bolts is to check that the design and manufacturing
conditions of a bolt allow it to satisfy the requirements of this document.
NOTE In order to simplify the text the term "inspections" used in this document also refers to "inspections
and tests".
Quality documentation for parts produced in accordance to this document shall be maintained for a
minimum period of 10 years.
Qualification of the bolts shall be granted by the certification authorities in the purchaser's country, or
their appointed representative, who may be the prime contractor.
The purpose of production acceptance inspection of a bolt is to check, as simply as possible, using
a method which is inexpensive but the most representative of the actual conditions of use, with the
uncertainty inherent in statistical sampling, that the bolts satisfy the requirements of this document.
Production acceptance inspections shall be carried out by the manufacturer, or under his responsibility.
4.2 Qualification inspection conditions
Unless otherwise specified, the inspection shall be carried out on:
— each type and diameter of bolt;
— 25 bolts selected from a single inspection lot by simple random sampling.
The test programme may possibly be reduced, or the qualification granted without inspection; any such
decision shall be based on the results obtained on similar types and diameters of bolt provided that the
design and manufacturing conditions are identical.
The inspections shall be repeated on any bolt if the manufacturing conditions have been modified.
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ISO/FDIS 7689:2022(E)
Table 2 indicates the allocation of bolt samples for the inspections.
4.3 Acceptance inspection conditions
Inspections shall be carried out on each production batch or inspection lot. Bolts from the batch or lot
to be inspected shall be selected by simple random sampling.
Each bolt may be submitted to several inspections, provided that none of the characteristics to be
verified has been previously altered during any of these inspections.
The bolts to be subjected to destructive inspections may be those on which non-destructive inspections
have been carried out.
If a more stringent inspection is deemed necessary, all or part of the qualification inspections may be
performed during the acceptance inspections. In this case, the number of bolts submitted is the same as
that submitted for qualification inspection.
Production batches or inspection lots declared unacceptable after the production acceptance
inspections shall be submitted for re-inspection only after all the defective units have been removed
and/or defects have been corrected. In this case, the attribute(s) that caused the rejection shall be
verified using a sample of twice the normal size but with the same number of acceptable defective items.
4.4 Use of "statistical process control (SPC)"
When a characteristic is obtained by a controlled statistical process, in order to declare conformity
of the characteristic, the manufacturer has the possibility of refraining from the final systematic
sampling provided for in this document if they are capable of formally justifying this choice by using
ISO/TR 13425 and the standards quoted in it as a basis.
This justification includes the following phases:
— analysis of the key characteristics of the product;
— analysis of the risks for each implemented process;
— determination of the parameters and/or characteristics to be respected under SPC;
— determination of the capabilities of each process;
— drawing up of an inspection plan and integration in the manufacturing process;
— drawing up of routes and control charts (ISO 7870-3, ISO 7870-1, ISO 8258);
— use of control charts for data consolidation;
— determination of the audits to be run and the control to be carried out to ensure reliability of the
device.
To be usable in production, this process shall or should be validated beforehand by the qualifying body,
either during the qualification phase or a posteriori, according to the case, by analysing the justificatory
file and the results of the qualification inspections such as provided for in Clause 5. Such an SPC
process is not applicable to destructive tests.
5 Requirements
The requirements in Table 1, unless otherwise specified, shall apply to bolts ready for use. The test
temperature, unless otherwise specified, shall be the ambient temperature. These requirements
complement the requirements of all other standards or specifications referenced in the definition
document.
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ISO/FDIS 7689:2022(E)
Table 1 — Requirements and test methods
Character- Inspection and test Designa-
No. Requirement Sample size
a
istic method tion
5-1 Material In accordance with the defini­ See material standard. As required
tion document. by semi­
finished
product
5-2 Dimensions In accordance with the defini­ Standard gauging. Q 20
tion document.
A See Table 3
ISO 5855-2 shall apply.
and Table 4
Dimensions shall include the
chemical applied or electroplat­
ed finishes designated on the
detailed drawing. Dimensions
shall exclude paint and similar
coating, metallic dips and dry
film lubricants.
5-3 Manufacturing
5-3-1 Forging The heads of the bolts shall be According to the route Q
formed by a hot or cold forging of manufacture.

process before heat treatment.
In the case of hot forging, the The equipment used
equipment shall ensure an shall be approved.
adequate and uniform tempera­
ture throughout the production
batch.
5-3-2 Heat treat­ The forged blanks shall be According to the pro­ Q
ment heat­treated to produce the cess route.

properties required by the defi­
The equipment used
nition document. Blanks shall
shall be approved.
not be heat­treated more than
twice.
5-3-3 Removal If machining is required, it is
of surface necessary to respect the re­
contamination quirements of 5-5-1.
(bearing face
and shank)
5-3-4 Threads Formed by a single rolling pro­ According to the man­ Q
cess after full heat treatment. ufacturing route.

5_3-5 Surface rough­ In accordance with the defini­ ISO 21920­3 shall Q 5
ness tion document. apply.
A See Table 3
and Table 4
Visual examination.
5-3-6 Surface coat­ In accordance with the defini­ See surface coating Q 5
ing tion document. standard.
A See Table 3
and Table 4
5-4 Mechanical
properties
5-4-1 Tensile See Table 5. On bolts: ISO 7961 Q 5
strength shall apply.
The requirements apply on bolts A for Table 6 or
except on the following: bolts, not Table 7
for s
...