This part of ISO 18669 specifies the essential dimensional characteristics of piston pins with an outer diameter between 8 mm and 100 mm, for reciprocating internal combustion engines for road vehicles and other applications. In addition, it establishes a vocabulary, a pin-type classification, material description based on mechanical properties, common features and quality requirements.

The use of this part of ISO 18669 may require a manufacturer and customer statistical process control agreement.