ISO 2705:2006

Road vehicles — M12 x 1,25 spark-plugs with flat seating and their cylinder head housings

ISO 2705:2006 specifies characteristics of M12 x 1,25 spark-plugs with flat seating and their cylinder head housings, for use with spark-ignition engines.

Véhicules routiers — Bougies d'allumage M12 x 1,25 à siège plat et leurs logements dans la culasse

General Information

• Status: Withdrawn
• Publication Date: 11-Oct-2006
• Withdrawal Date: 11-Oct-2006
• 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: 9599 - Withdrawal of International Standard
• Completion Date: 04-Feb-2011

Relations

• Revises: ISO 2705:1999 - Road vehicles — M12 x 1,25 spark-plugs with flat seating and their cylinder head housings
• Effective Date: 15-Apr-2008

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 2705
Sixth edition
2006-10-01

Road vehicles — M12 x 1,25 spark-plugs
with flat seating and their cylinder head
housings
Véhicules routiers — Bougies d'allumage M12 × 1,25 à siège plat et
leurs logements dans la culasse




Reference number
ISO 2705:2006(E)
©
ISO 2006

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ISO 2705:2006(E)
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ISO 2705:2006(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 2705 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 1, Ignition
equipment.
This sixth edition cancels and replaces the fifth edition (ISO 2705:1999), which has been technically revised.

© ISO 2006 – All rights reserved iii

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INTERNATIONAL STANDARD ISO 2705:2006(E)

Road vehicles — M12 × 1,25 spark-plugs with flat seating and
their cylinder head housings
1 Scope
This International Standard specifies characteristics of M12 × 1,25 spark-plugs with flat seating and their
cylinder head housings, for use with spark-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 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, 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
threads
ISO 14508, Road vehicles — Spark-plugs — Terminals
3 Terminals
The spark-plug terminal may be either the solid post or the threaded type as specified in ISO 14508.
A spark-plug with threaded terminal on which a nut is applied shall respect the dimensions specified for
spark-plugs with solid post terminals (see Figures 1 and 2).
4 Dimensions and threads
4.1 Spark-plug reach
The spark-plug reach shall be according to Table 1 (see Figures 1 to 4).
© ISO 2006 – All rights reserved 1

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ISO 2705:2006(E)
Table 1 — Spark-plug reach
Dimensions in millimetres

a
A B Y
E
Type of reach max. + 0,3
Tolerance of A + E: ± 0,2
− 0,8
Normal 12,7 21 11,7
0
Long
27
19 18
Extended long 1,5 … 6 31
Extra long 0 34,5
26,5 25,5
Extended extra long 1,5 … 6 38,5
a
It is intended to specify E more definitively in future revisions of this International Standard.
4.2 Gasket
When the spark-plugs have been tightened with a torque of 25 Nm, on thread
...