Aerospace — Nuts, metric — Tolerances of form and position

This document defines the tolerances of form and position of metric nuts meant for aerospace construction. These tolerances comply with ISO 1101, ISO 2692 and ISO 5459.

Aéronautique et espace — Écrous métriques — Tolérances de forme et de position

General Information

Status
Published
Publication Date
17-May-2020
Current Stage
6060 - International Standard published
Start Date
17-Apr-2020
Completion Date
18-May-2020
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ISO 8788:2020 - Aerospace -- Nuts, metric -- Tolerances of form and position
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INTERNATIONAL ISO
STANDARD 8788
Third edition
2020-05
Aerospace — Nuts, metric —
Tolerances of form and position
Aéronautique et espace — Écrous métriques — Tolérances de forme
et de position
Reference number
ISO 8788:2020(E)
ISO 2020
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ISO 8788:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

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

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below or ISO’s member body in the country of the requester.
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Published in Switzerland
ii © ISO 2020 – All rights reserved
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ISO 8788:2020(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Types of nuts, illustration of tolerances of form and position, values..........................................................1

Annex A (informative) Plain nuts ..........................................................................................................................................................................10

Annex B (informative) Slotted nuts .....................................................................................................................................................................11

Annex C (informative) Self-locking nuts with wrenching feature, with plastic locking ring ..................12

Annex D (informative) Self-locking hexagonal nuts, with wrenching feature, formed out-of-

round .............................................................................................................................................................................................................................13

Annex E (informative) Self-locking bihexagonal nuts, with wrenching feature, formed out-

of-round ......................................................................................................................................................................................................................14

Annex F (informative) Self-locking clinch/shank nuts ...................................................................................................................15

Annex G (informative) Self-locking anchor nuts, two lug .............................................................................................................16

Annex H (informative) Self-locking anchor nuts, single lug ......................................................................................................17

Annex I (informative) Self-locking anchor nuts, corner ................................................................................................................18

Bibliography .............................................................................................................................................................................................................................19

© ISO 2020 – All rights reserved iii
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ISO 8788:2020(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.

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 8788:2000), of which it constitutes a

minor revision.
The changes compared to the previous edition are as follows:

— informative references changed from dated to undated and moved to the Bibliography;

— the document editorially revised.

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.
iv © ISO 2020 – All rights reserved
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INTERNATIONAL STANDARD ISO 8788:2020(E)
Aerospace — Nuts, metric — Tolerances of form and
position
1 Scope

This document defines the tolerances of form and position of metric nuts meant for aerospace

construction. These tolerances comply with ISO 1101, ISO 2692 and ISO 5459.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4 Types of nuts, illustration of tolerances of form and position, values

See Table 1 for the tolerances of form and position to be applied in relation to the type of nut, Table 2 to

Table 11 for the illustration of tolerances of form and position for different types of nut. See Tables 12

and Table 13 for the values of the tolerances. In the “illustration” column, only one type of nut has been

shown as an example, but the corresponding tolerance applies to all types of nut specified in the third

column.
© ISO 2020 – All rights reserved 1
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ISO 8788:2020(E)
2 © ISO 2020 – All rights reserved

Table 1 — Tolerances of form and position to be applied in relation to the type of nut

Sequence number
Plain nuts Slotted Self-locking nuts
nuts
Table Tolerance of former position with wrenching feature clinch/shank anchor
formed out-of-round two-lug single-lug corner
...

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