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ISO 12251:2017

Diesel engines — Clamp mounted CR fuel injectors — Mounting dimensions

Oct 4, 2017
95.99   Withdrawal of Standard   Jan 26, 2026

General information

95.99     Jan 26, 2026

ISO

ISO/TC 22/SC 34

International Standard

43.060.40  

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Scope

ISO 12251 specifies dimensional requirements for clamp mounted CR fuel injectors and their corresponding cylinder head features in diesel engines.
According to the injector nozzle capnut, the clamp mounted CR fuel injectors can be divided into two types:
a) Type A, where the nozzle capnut is straight (see Figure 4);
b) Type B, where the nozzle capnut is stepped (see Figure 5).
Each clamp mounted CR fuel injector type is subdivided by a series of different sizes.
NOTE This differentiation corresponds to the relationship between the two guide diameters of the clamp mounted CR fuel injectors.

Life cycle

PREVIOUSLY

WITHDRAWN
ISO 12251:2011

NOW

WITHDRAWN
ISO 12251:2017
95.99 Withdrawal of Standard
Jan 26, 2026

REVISED BY

PUBLISHED
ISO 12251:2026