ISO/CD 13948-1

Diesel engines — Fuel injection pumps and fuel injector low-pressure connections — Part 1: Threaded connections

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ISO 13948-1:2015 specifies dimensions and requirements for mechanical, threaded connections used on diesel fuel injection pumps and fuel injectors for the connection of low-pressure fuel, lubrication oil or air supply.
Five types of threaded connections (types A to E) are described in this part of ISO 13948. Type A is commonly used for both pumps and injectors, while types B to E are for diesel fuel injection pumps only.
NOTE: Low-pressure connections to fuel filters are covered in other International Standards; see the Bibliography. High-pressure end-connections for pumps and injectors are covered in ISO 2974