ISO 17447-2:2015

Road Vehicles - Glow-plugs with conical seating and their cylinder head housing - Part 2: Basic characteristics and dimensions for ceramic-sheath-type glow-plugs

ISO 17447-2:2015 specifies the main properties and dimensions of ceramic-sheath-type glow-plugs, including the terminals and the dimensions of their cylinder head housings, for use with diesel (compression ignition) engines.

Véhicules routiers — Bougies de préchauffage à fourreau et à siège conique et leur logement dans la culasse — Partie 2: Caractéristiques de base et dimensions des bougies de préchauffage à fourreau de type céramique

General Information

• Status: Published
• Publication Date: 12-May-2015
• ICS: 43.060.50 - Electrical and electronic equipment. Control systems
• Technical Committee: ISO/TC 22/SC 32 - Electrical and electronic components and general system aspects
• Drafting Committee: ISO/TC 22/SC 32/WG 1 - Ignition Equipment
• Current Stage: 9093 - International Standard confirmed
• Start Date: 17-Jun-2021
• Completion Date: 13-Dec-2025

Relations

• Consolidated By: ISO 9241-960:2017 - Ergonomics of human-system interaction - Part 960: Framework and guidance for gesture interactions
• Effective Date: 06-Jun-2022
• Revises: ISO 6550-3:2009 - Road vehicles - Sheath-type glow-plugs with conical seating and their cylinder head housing - Part 3: M10 glow-plugs
• Effective Date: 21-May-2011
• Revises: ISO 6550-1:1994 - Road vehicles - Sheath-type glow-plugs with conical seating and their cylinder head housing - Part 1: M14 x 1,25 glow-plugs
• Effective Date: 21-May-2011
• Revises: ISO 7578:2008 - Road vehicles - Sheath-type glow-plugs - General requirements and test methods
• Effective Date: 21-May-2011
• Revises: ISO 6550-4:2009 - Road vehicles - Sheath-type glow-plugs with conical seating and their cylinder head housing - Part 4: M8 x 1 glow-plugs
• Effective Date: 21-May-2011
• Revises: ISO 6550-2:1994 - Road vehicles - Sheath-type glow-plugs with conical seating and their cylinder head housing - Part 2: M12 x 1,25 glow-plugs
• Effective Date: 21-May-2011

Overview

ISO 17447-2:2015 specifies the basic characteristics and dimensions for ceramic‑sheath‑type glow‑plugs and their cylinder head housings for diesel (compression‑ignition) engines. It is part of the ISO 17447 series covering glow‑plugs with conical seating and provides a single, consolidated reference for design, interchangeability and installation of ceramic‑sheath glow‑plugs.

Key topics and requirements

• Scope: Main properties, design requirements and dimensional data for ceramic‑sheath glow‑plugs, terminals and corresponding cylinder head housings.
• Threads and tolerances:
  • Glow‑plug threads: nominal sizes include M10 × 1.25, M10 × 1 and M8 × 1.
  • New designs: thread tolerance class 6g; tapped holes in cylinder heads: 6H. Existing designs with 6e are permitted.
  • Dimension limits and fundamental deviations for pitch/minor diameters are given in tabulated form.
• Glow‑plug geometry:
  • Detailed body, heating‑element (types H1, H2) and terminal geometry referenced in figures and tables.
  • Pin terminals P1 and P2 defined (detailed dimensions in Annex A).
• Cylinder head housing: Housing dimensions and tolerances for M10 and M8 types are specified to ensure correct seating and sealing.
• Installation torque:
  • Recommended tightening torques are provided (e.g., M10: 10–20 Nm; M8: 9–12 Nm; M4 terminal thread: 0.8–1.5 Nm), with guidance to reduce torque by ~1/3 when threads are lubricated.
• Normative references: Applies ISO screw‑thread standards (ISO 68‑1, ISO 261, ISO 965‑1/3) and geometrical tolerancing (ISO 1101).

Applications and practical value

• Ensures interchangeability of ceramic‑sheath glow‑plugs across manufacturers and engine designs.
• Guides design engineers on correct thread classes, seating and housing dimensions to prevent leakage, seizure and installation damage.
• Supports manufacturers and suppliers in producing components that meet international dimensional tolerances.
• Aids service and maintenance technicians with correct installation torque and terminal compatibility.
• Useful for quality control, procurement specifications and component validation in diesel engine development and aftermarket parts.

Who should use this standard

• Glow‑plug manufacturers and materials engineers
• Internal combustion engine designers and OEMs
• Cylinder head and engine component suppliers
• Automotive test labs, quality assurance and aftermarket service organizations

Related standards

• ISO 17447‑1 (metal‑sheath glow‑plugs), ISO 17447‑3 (tests and requirements)
• ISO 68‑1, ISO 261, ISO 965‑1/3 (metric thread standards)
• ISO 1101 (geometrical tolerancing), plus ISO 2768‑2 and ISO 8092 series for electrical connections

Keywords: ISO 17447-2, glow-plugs, ceramic-sheath, diesel engines, cylinder head housing, M10, M8, thread tolerances, installation torque.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 17447-2
First edition
2015-05-15
Road Vehicles — Glow-plugs with
conical seating and their cylinder
head housing —
Part 2:
Basic characteristics and dimensions
for ceramic-sheath-type glow-plugs
Véhicules routiers — Bougies de préchauffage à fourreau et à siège
conique et leur logement dans la culasse —
Partie 2: Caractéristiques de base et dimensions des bougies de
préchauffage à fourreau de type céramique
Reference number
©
ISO 2015
© ISO 2015, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
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the requester.
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www.iso.org
ii © ISO 2015 – All rights reserved

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 . 3
4.2.3 Electrical connection . 4
4.2.4 Dimensions for M10 and M8 glow-plugs . 4
4.3 Cylinder head housing dimensions . 4
4.3.1 General. 4
4.3.2 Housing dimensions . 5
5 Installation tightening torque . 5
Annex A (normative) Pin terminal dimensions . 7
Bibliography . 9
Foreword
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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
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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
iv © ISO 2015 – All rights reserved

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.
ISO 17447-1 covers basic characteristics and dimensions for metal-sheath-type glow-plugs. This part of
ISO 17447 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.
INTERNATIONAL STANDARD ISO 17447-2:2015(E)
Road Vehicles — Glow-plugs with conical seating and their
cylinder head housing —
Part 2:
Basic characteristics and dimensions for ceramic-sheath-
type glow-plugs
1 Scope
This part of ISO 17447 specifies the main properties and dimensions of ceramic-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 documen
...