ISO 17447-1:2015

INTERNATIONAL ISO
STANDARD 17447-1
First edition
2015-05-15
Road Vehicles — Glow-plugs with
conical seating and their cylinder
head housing —
Part 1:
Basic characteristics and dimensions
for metal-sheath-type glow-plugs
Véhicules routiers — Bougies de préchauffage à fourreau et à siège
conique et leur logement dans la culasse —
Partie 1: Caractéristiques de base et dimensions des bougies de
préchauffage à fourreau de type métallique
Reference number
ISO 17447-1:2015(E)
©
ISO 2015

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ISO 17447-1:2015(E)

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© ISO 2015, Published in Switzerland
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ii © ISO 2015 – All rights reserved

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ISO 17447-1:2015(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Dimensions and tolerances . 2
4.1 Threads-dimension limits and tolerances . 2
4.2 Glow-plugs . 3
4.2.1 General. 3
4.2.2 Heating elements . 4
4.2.3 Electrical connection . 4
4.2.4 Dimensions for M14, M12, M10, and M8 glow-plugs . 6
4.3 Cylinder head housing . 7
4.3.1 General. 7
4.3.2 Housing dimensions . 8
5 Installation tightening torque . 8
Annex A (normative) Pin terminal dimensions .10
Annex B (informative) M8 × 1 glow-plugs with 10 mm hexagon and their cylinder head housing .12
Bibliography .13
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ISO 17447-1:2015(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 on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT), see the following URL: Foreword — Supplementary information.
The committee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 32, Electrical
and electronic components and general system aspects.
ISO 17447 consists of the following parts, under the general title Road Vehicles — Glow-plugs with conical
seating and their cylinder head housing:
— Part 1: Basic characteristics and dimensions for metal-sheath-type glow-plugs
— Part 2: Basic characteristics and dimensions for ceramic-sheath-type glow-plugs
— Part 3: Tests and requirements
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ISO 17447-1:2015(E)

Introduction
The purpose of this International Standard is to provide a compact and concise specification on glow-
plugs and their cylinder head housings, which is to replace the existing single standards on each type of
glow-plugs.
It is intended to specify the main properties, the design requirements, and the dimensions of most of the
existing types of glow-plugs and their cylinder head housings. It is to enable the user to work with one
comprehensive document valid for most types of glow-plugs instead of a number of standards, each of
them specified for one type only.
This part of ISO 17447 covers basic characteristics and dimensions for metal-sheath-type glow-plugs.
ISO 17447-2 covers basic characteristics and dimensions for ceramic-sheath-type glow-plugs. Tests and
requirements are defined in ISO 17447-3.
It is intended to withdraw the following standards on glow-plugs and their cylinder head housing as
soon as this part of ISO 17447 is published:
ISO 6550-1, ISO 6550-2, ISO 6550-3, ISO 6550-4, ISO 7578.
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INTERNATIONAL STANDARD ISO 17447-1:2015(E)
Road Vehicles — Glow-plugs with conical seating and their
cylinder head housing —
Part 1:
Basic characteristics and dimensions for metal-sheath-
type glow-plugs
1 Scope
This part of ISO 17447 specifies the main properties and dimensions of metal-sheath-type glow-
plugs, including the terminals and the dimensions of their cylinder head housings, for use with diesel
(compression ignition) engines.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 68-1, ISO general purpose screw threads — Basic profile — Part 1: Metric screw threads
ISO 261, ISO general purpose metric screw threads — General plan
ISO 965-1:2013, ISO general purpose metric screw threads — Tolerances — Part 1: Principles and basic
data
ISO 965-3, ISO general purpose metric screw threads — Tolerances — Part 3: Deviations for constructional
screw threads
ISO 1101, Geometrical product specifications (GPS) — Geometrical tolerancing — Tolerances of form,
orientation, location and run-out
3 Terms and definitions
For the purpose of this document, the following terms and definitions apply.
3.1
nominal voltage
voltage as marked on the housing of the glow-plug
Note 1 to entry: The nominal voltage of the glow-plug is generally not identical to the supply voltage of the vehicle’s
electrical system.
3.2
test voltage
voltage(s) applied to the glow-plug under test
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ISO 17447-1:2015(E)

4 Dimensions and tolerances
4.1 Threads-dimension limits and tolerances
The threads of glow-plugs and the corresponding tapped holes in cylinder heads shall be in accordance
with ISO 68-1, ISO 261, ISO 965-1, and ISO 965-3.
The tolerance class 6g shall be used for glow-plug threads. For existing designs, tolerance class 6e is also
permitted. New designs shall be to tolerance class 6g.
The thread in the corresponding tapped holes in the cylinder heads shall have tolerance class 6H.
The threads, dimension limits, and tolerances of glow-plugs and the corresponding tapped holes in the
cylinder head are given in Tables 1 and 2.
Table 1 — Dimension limits
Dimensions in mil
...