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ISO 6621-4 : 2024

Internal combustion engines — Piston rings — Part 4: General specifications

Standard Details

This document specifies the general characteristics of piston rings for reciprocating internal combustion engines for road vehicles and other applications (the individual dimensional criteria for these rings are given in the relevant International StandardDetails). It also provides a system for ring coding, designation, and marking. It is applicable to all such rings of a nominal diameter from 30 mm up to and including 200 mm.

General Information

Status : Published
Standard Type: Main
Document No: ISO 6621-4 : 2024
Document Year: 2024
Pages: 28
Edition: 4
  • ICS:
  • 43.060.10 Engine block and internal components

Life Cycle

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ISO 6621-4 : 2024
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