ISO/DIS 4579

Aerospace -- Drives, internal, TORX PARALOBE drive -- Geometrical definition, gaging and technical requirements

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DRAFT INTERNATIONAL STANDARD
ISO/DIS 4579
ISO/TC 20/SC 4 Secretariat: DIN
Voting begins on: Voting terminates on:
2021-02-08 2021-05-03
Aerospace — Drives, internal, TORX PARALOBE drive —
Geometrical definition, gaging and technical requirements
ICS: 49.030.01
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
This document is circulated as received from the committee secretariat.
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 4579:2021(E)
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 SUPPORTING DOCUMENTATION. ISO 2021
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ISO/DIS 4579:2021(E)
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© ISO 2021

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

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ii © ISO 2021 – All rights reserved
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ISO/DIS 4579:2021(E)
Contents Page

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

Introduction ..................................................................................................................................................................................................................................v

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

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

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

4 Basic fastener recess configuration .................................................................................................................................................. 1

4.1 Recess dimensions — metric and inch............................................................................................................................... 2

4.2 Recess drive designation ................................................................................................................................................................ 3

5 Recess inspection ................................................................................................................................................................................................. 3

5.1 Gaging equipment ................................................................................................................................................................................ 3

5.2 Gaging procedure .................................................................................................................................................................................. 5

5.3 Penetration type gage dimensions — metric and inch ........................................................................................ 5

6 Fastener recess torque test ........................................................................................................................................................................ 5

6.1 Fixture ............................................................................................................................................................................................................ 5

6.2 Torque wrench/torsion machine ............................................................................................................................................ 6

6.3 Driver bit ...................................................................................................................................................................................................... 6

6.4 Test specimen ........................................................................................................................................................................................... 6

6.5 Fastener recess torque test procedure ............................................................................................................................... 6

6.6 Fastener recess torque values .................................................................................................................................................... 6

© ISO 2021 – All rights reserved iii
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ISO/DIS 4579:2021(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.

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 2021 – All rights reserved
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ISO/DIS 4579:2021(E)
Introduction

ISO draws attention to the fact that it is claimed that compliance with this document may involve the

use of a US patent “DRIVE SYSTEM WITH FULL SURFACE DRIVE CONTACT” 10,697,499 B2. ISO takes no

position concerning the evidence, validity and scope of this patent right.

The holder of this patent right has assured ISO that he/she is willing to negotiate licenses under

reasonable and non-discriminatory terms and conditions with applicants throughout the world. In

this respect, the statement of the holder of this patent right is registered with ISO. Information may be

obtained from:
Acument Intellectual Properties, LLC
6125 Eighteen Mile Road
Sterling Heights, MI 48314
U.S.A.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights other than those identified above. ISO shall not be held responsible for identifying any or

all such patent rights.
Acument Intellectual Properties, LLC
6125 Eighteen Mile Road
Sterling Heights, MI 48314
U.S.A.
© ISO 2021 – All rights reserved v
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DRAFT INTERNATIONAL STANDARD ISO/DIS 4579:2021(E)
Aerospace — Drives, internal, TORX PARALOBE drive —
Geometrical definition, gaging and technical requirements
1 Scope

This international standard specifies basic dimensions, characteristics and engineering requirements

® ®
for TORX PARALOBE recesses in aerospace fasteners.
2 Normative referenc
...