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  • BSI
    BS ISO 6621-5:2020 Internal combustion engines. Piston rings - Quality requirements
    Edition: 2020
    $316.70
    / user per year

Description of BS ISO 6621-5:2020 2020

This document specifies quality aspects that can be defined but that are not normally found on a drawing specification.

It covers the following:

  • single?piece piston rings of grey cast iron or steel;

  • multi?piece piston rings (oil control rings) consisting of cast iron parts and spring components; and

  • single?piece and multi?piece oil control rings of steel, i.e. oil control rings in the form of strip steel components or steel segments (rails) with spring expander components.

In addition to specifying some of the limits of acceptance relating to inspection measuring principles (covered by ISO 6621-2), this document also covers those features for which no recognized quantitative measurement procedures exist and which are only checked visually with normal eyesight (glasses if worn normally) and without magnification. Such features (superficial defects) are additional to the standard tolerances of ring width, radial wall thickness and closed gap.

This document does not establish acceptable quality levels (AQL), it being left to manufacturer and customer to decide the appropriate levels jointly. In this case, the recommendations of ISO 2859-1 are followed.

This document specifies the quality requirements of piston rings for reciprocating internal combustion engines for road vehicles and other applications. It is applicable to all such rings of a nominal diameter from 30 mm up to and including 200 mm.



Standard NumberBS ISO 6621-5:2020
TitleInternal combustion engines. Piston rings - Quality requirements
StatusDefinitive
Publication Date2020-01-31
ReplacesBS ISO 6621-5:2013
Identical National Standard OfISO 6621-5
DescriptorsForce, Pistons, Quality, Visual inspection (testing), Engine components, Defects, Reciprocating engines, Surface defects, Machining tolerances, Testing conditions, Reciprocating parts, Size, Piston rings
ICS43.060.10 Engine block and internal components
CommitteeMCE/22
ISBN978 0 580 90519 3
PublisherBSI
Pages22

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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