ISO 8535-1:2006

INTERNATIONAL ISO
STANDARD 8535-1
Fourth edition
2006-08-01

Diesel engines — Steel tubes for high-
pressure fuel injection pipes —
Part 1:
Requirements for seamless cold-drawn
single-wall tubes
Moteurs diesels — Tubes en acier pour lignes d'injection de
combustible à haute pression —
Partie 1: Exigences pour les tubes monoparoi sans soudure étirés
à froid




Reference number
ISO 8535-1:2006(E)
©
ISO 2006

---------------------- Page: 1 ----------------------
ISO 8535-1:2006(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.


©  ISO 2006
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland

ii © ISO 2006 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 8535-1:2006(E)
Contents Page
Foreword. iv
1 Scope . 1
2 Normative references . 1
3 Dimensions and tolerances . 1
3.1 Diameters. 1
3.2 Length . 2
4 Material processing . 4
4.1 Steel manufacturing process . 4
4.2 Manufacturing of tubes . 4
4.3 Surface quality . 4
4.4 Surface finish . 4
4.5 Minimum mechanical properties of tubes.5
4.6 Cleanliness . 5
4.7 Straightness . 5
4.8 Corrosion-resistance. 5
5 Testing . 6
5.1 General. 6
5.2 Scope of tests . 6
5.3 Dimension tests . 6
5.4 Mechanical property tests . 6
5.5 Bending test . 6
5.6 Cold upsetting of tubes. 6
5.7 Surface quality test. 6
5.8 Inside pressure test. 7
5.9 Retesting. 7
5.10 Test certificate. 7
6 Designation . 7
7 Identification and marking . 8
8 Packing . 8
Annex A (informative) Theoretical maximum pressure for inside pressure testing . 9
Bibliography . 10

© ISO 2006 – All rights reserved iii

---------------------- Page: 3 ----------------------
ISO 8535-1:2006(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 8535-1 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 7, Injection
equipment and filters for use on road vehicles.
This fourth edition cancels and replaces the third edition (ISO 8535-1:1996), which has been technically
revised.
ISO 8535 consists of the following parts, under the general title Diesel engines — Steel tubes for
high-pressure fuel injection pipes:
⎯ Part 1: Requirements for seamless cold-drawn single-wall tubes
⎯ Part 2: Requirements for composite tubes
NOTE The first part of the general title “Diesel engines” is used for Part 1 only; for Part 2 “Compression-ignition
engines” is still used but will be replaced at the next revision.
Annex A is for information only.

iv © ISO 2006 – All rights reserved

---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 8535-1:2006(E)

Diesel engines — Steel tubes for high-pressure fuel injection
pipes —
Part 1:
Requirements for seamless cold-drawn single-wall tubes
1 Scope
This part of ISO 8535 specifies dimensions and requirements for seamless cold-drawn single-wall steel tubes
for high-pressure fuel injection pipes used on diesel (compression-ignition) engines (class 2) and for fuel
injection pump testing (class 1).
It applies to diesel (compression-ignition) engines.
2 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 404, Steel and steel products — General technical delivery requirements
ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method
ISO 6892, Metallic materials — Tensile testing at ambient temperature
ISO 12345, Diesel engines — Cleanliness assessment of fuel injection equipment
3 Dimensions and tolerances
3.1 Diameters
Recommended inside and outside diameters are given in Table 1. Other sizes may be used by agreement
between supplier and purchaser.
1)
Tolerances on inside and outside diameters shall be as follows:
a) Inside diameter, d:
d u 4mm: ± 0,05 mm for class 2;
± 0,025 mm for class 1;
d > 4mm: ± 0,10 mm for class 2.
NOTE Classes 1 and 2 are explained in Clause 1.

1) These tolerances are in accordance with ISO 4093.
© ISO 2006 – All rights reserved 1

---------------------- Page: 5 ----------------------
ISO 8535-1:2006(E)
b) Outside diameter, D, for classes 1 and 2:
D < 8 mm: ± 0,06 mm;
D W 8 mm: ± 0,10 mm.
c) Concentricity of the tube outside diameter relative to the inside diameter shall be proportional to the wall
thickness, as shown in Figure 1.

Key
D outside diameter
d inside diameter
t wall thickness
Figure 1 — Concentricity of the tube outside diameter
3.2 Length
Length and tolerances on length shall be by agreement between supplier and purchaser.
2 © ISO 2006 – All rights reserved

---------------------- Page: 6 ----------------------
ISO 8535-1:2006(E)
Table 1 — Recommended inside and outside diameters
Dimensions in millimetres

a
Inside diameter Outside diameter
d D
4 5
Preferred 4,5 6 7 8 10 12 15 19 24 30
1
1,12
1,25
1,4
1,5
1,6
1,7
1,8
1,9
2
2,12  Size combinations to be used
2,24 appear between heavy lines
2,36
2,5
2,65
2,8
3
3,15
3,35
3,55
3,75
4
4,25
4,5
...