ISO 2345:1981

International Standard @ 2345
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION*ME)YHAPOAHAR OPrAHMBAUMR fl0 CTAH~APTH3AUHH.ORGANlSATlON INTERNATIONALE DE NORMALISATION
L Road vehicles - Spark plugs M 18 x 1,5 with conical
seating and their cylinder head housing
Véhicules routiers - Bougies d'allumage M 18 x 1,5 à siège conique et leur logement dans la culasse
Third edition - 1981-05-15
- UDC 621.43.045 Ref. No. IS0 2345-1981 (E)
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Descriptors : road vehicles, motor vehicles, internal combustion engines, ignition systems, spark plugs, conical components, threaded
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mechanical parts, screw threads, dimensions, dimensional tolerances.
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s Price based on 4 pages

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Foreword
IS0 (the International Organization for Standardization) is a worldwide federation of
national standards institutes (IS0 member bodies). The work of developing Inter-
national Standards is carried out through IS0 technical committees. Every member
body interested in a subject for which a technical committee has been set up 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.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the IS0 Council.
International Standard IS0 2345 was developed by Technical Committee ISO/TC 22,
Road vehicles.
This third edition was submitted directly to the IS0 Council, in accordance with
clause 5.10.1 of part 1 of the Directives for the technical work of ISO. It cancels and
replaces the second edition (i.e. IS0 235-1976], which had been approved by the
:
member bodies of the following countries
Israel Spain
Australia
Austria Italy Sweden
Japan Switzerland
Belgium
Czechoslovakia Korea, Dem. P. Rep. of Turkey
Korea, Rep. of United Kingdom
Egypt, Arab Rep. of
France Netherlands USA
Germany, F. R. Portugal USSR
Hungary Romania
South Africa, Rep. of
Ireland
No member body had expressed disapproval of the document.
O International Organization for Standardization, 1981 O
Printed in Switzerland

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INTERNATIONAL STANDARD IS0 ??4.5:!-?6.1. . . , (E)/ERRATUM
PuMished 19 6.1 . . - . .
INTERNATIONAL ORGANUATION FOR STANDARDIZATION .MEXAYHA,WIIHAI OPïAHHUUHR no CTAHIJAPTHUUHH .ORGANISATION INTERNATtONALE Of NORMALISATION
Road vehicles - hark pluCs M 18 x 1.5 with conical seating and their
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i!
ERRATUM
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Sub-clause 4.2.1, sentence 3, read "10,9 2 0,3 mm" instead of "109 2 0,3 rn".
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INTERNATIONAL STANDARD IS0 2345-1981 (E)
Road vehicles - Spark plugs M 18 x 1,5 with conical
seating and their cylinder head housing
4.2 Dimensions and thread (see figures 1 and 2)
1 Scope
This International Standard specifies the main dimensional
4.2.1 Length dimensions
characteristics of a spark plug type used with spark ignition
engines.
The length dimensions are measured from a gauging plane
defined by diameter 1191 on the seating.
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Dimension 13,5 min is allowed for an interim period. For future
2 Field of application manufacturing, the dimension 12,0 min is recommended.
The provisions of this International Standard apply to spark
Dimension @ I 0,3 rnm may be increased for certain spark
plugs M 18 x 1.5 with conical seating and to their cylinder
plug types.
head housing. 7 40,9
4.2.2 Dimensions of spark plug housing in the cylinder
head
3 References
The length dimensions 10,5 min. and 9 max. in the cylinder
head are measured from a gauging plane defined by diameter
IS0 68, IS0 general purpose screw threads - Basic profile.
1191 on the seating.
IS0 261, IS0 general purpose metric screw threads - General
Dimension 10,5 min. shall ensure that no threaded portion of
plan.
the plug reach may enter the combustion chamber when the
spark plug is tightened with the torque specified in 4.4.
IS0 96511, IS0 general purpose metric screw threads -
Tolerances - Part 1 : Principles and basic data.
4.2.3 Thread
IS0 96513, IS0 general purpose metric screw threads -
4.2.3.1 Dimension limits
Tolerances - Part 3 : Deviations for constructional threads.
Values in millimetres
Plug thread Tapped hole in
4 Required characteristics Dimension (on finished plug) cylinder head
I I 6e 1 6H
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4.1 Terminais (see figu
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