ISO 6621-4:2003
Internal combustion engines - Piston rings - Part 4: General specifications

Standard No.

ISO 6621-4:2003

Release Date

2003

Published By

International Organization for Standardization (ISO)

Status

Be replaced

Replace By

ISO 6621-4:2015

Latest

ISO 6621-4:2024

Scope

This part of ISO 6621 specifies the general characteristics of piston rings for both reciprocating internal combustion engines and compressors (the individual dimensional criteria for these rings are given in the relevant International Standards). It also provides a system for ring coding, designation and marking, It is applicable to all such rings of a diameter ≤ 200 mm.

ISO 6621-4:2003 Referenced Document

• ISO 6507-3 Metallic materials - Vickers hardness test - Part 3: Calibration of reference blocks*， 2018-01-01 Update
• ISO 6621-1 Internal combustion engines - Piston rings - Part 1: Vocabulary*， 2018-02-01 Update
• ISO 6621-2:2003 Internal combustion engines - Piston rings - Part 2: Inspection measuring principles*， 2003-11-01 Update

ISO 6621-4:2003 history

• 2024 ISO 6621-4:2024 Internal combustion engines — Piston rings — Part 4: General specifications
• 2015 ISO 6621-4:2015 Internal combustion engines - Piston rings - Part 4: General specifications
• 2003 ISO 6621-4:2003 Internal combustion engines - Piston rings - Part 4: General specifications
• 1988 ISO 6621-4:1988 Internal combustion engines; piston rings; part 4: general specifications