ISO 8535-1:2016

INTERNATIONAL ISO
STANDARD 8535-1
Sixth edition
2016-11-15
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 2016
© ISO 2016, Published in Switzerland
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ii © ISO 2016 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Dimensions and tolerances . 1
4.1 Diameters . 1
4.2 Length . 2
5 Material processing . 2
5.1 Steel manufacturing process . 2
5.2 Manufacturing of tubes . 2
5.3 Surface quality . 4
5.3.1 General. 4
5.3.2 Minimum quality inside surface (bore grade S) . 4
5.3.3 Higher quality inside surface (bore grades O, P, Q, R) . 4
5.4 Surface finish . 4
5.5 Minimum mechanical properties of tubes . 5
5.6 Cleanliness . 5
5.7 Straightness . 5
5.8 Corrosion resistance . 5
6 Testing . 5
6.1 General . 5
6.2 Scope of tests . 5
6.3 Dimension tests . 6
6.4 Mechanical-property tests . 6
6.5 Bending test . 6
6.6 Cold upsetting of tubes . 6
6.7 Surface quality test . 6
6.8 Inside pressure test . 6
6.9 Retesting . 6
6.10 Test certificate . 7
7 Designation . 7
8 Identification and marking. 8
9 Packing. 8
Annex A (informative) Theoretical maximum pressure for inside pressure testing .9
Bibliography .10
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
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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).
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Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.
The committee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 34,
Propulsion, powertrain, and powertrain fluids.
This sixth edition cancels and replaces the fifth edition (ISO 8535-1:2011), which has been technically
revised with the following changes:
— inside diameter sizes 3,5 mm and 3,6 mm have been added to Table 1;
— code 5 and code 6 have been added to Table 4.
A list of parts in the ISO 8535 series can be found on the ISO website.
NOTE The first part of the general title, “Diesel engines”, is used for Part 1 only while for Part 2, “Compression-
ignition engines” is still used but will be replaced at the next revision.
iv © ISO 2016 – All rights reserved

INTERNATIONAL STANDARD ISO 8535-1:2016(E)
Diesel engines — Steel tubes for high-pressure fuel
injection pipes —
Part 1:
Requirements for seamless cold-drawn single-wall tubes
1 Scope
This document 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).
This document applies to diesel (compression-ignition) engines.
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 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method
ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
ISO 12345, Diesel engines — Cleanliness assessment of fuel injection equipment
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:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
4 Dimensions and tolerances
4.1 Diameters
Recommended inside and outside diameters are given in Table 1. Other sizes may be used by agreement
between supplier and customer.
Tolerances on inside and outside diameters shall be as follows.
a) Inside diameter, d
d ≤ 4 mm: ±0,05 mm for class 2
±0,025 mm for class 1 (these tolerances are in accordance with ISO 4093)
d > 4 mm: ±0,10 mm
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