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ISO 6621-5:2020 Internal combustion engines - Piston rings - Part 5: Quality requirements >
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ISO 6621-5:2020 Internal combustion engines - Piston rings - Part 5: Quality requirements, 2020
- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Visible defects
- 4.1 General
- 4.2 Pores, cavities and sand inclusions
- 4.3 Scratches, indentations, depressions and cracks
- 4.3.1 Scratches
- 4.3.2 Indentations, depressions
- 4.3.3 Cracks
- 4.4 Edges
- 4.4.1 Edge configuration
- 4.4.2 Chipping and similar defects on peripheral edges and peripheral edges at the gap.
- 4.4.3 Chipping and defects on non-peripheral edges
- 4.4.4 Chipping and defects on inside gap corners
- 4.5 Other characteristics subject to visual inspection only
- 4.5.1 Discolouring or staining of surface
- 4.5.2 Casting skin and deposits on inside surface
- 4.5.3 Chipping on uncoated surfaces
- 4.5.4 Chromium plated peripheral surface
- 4.5.5 Spray coatings
- 4.5.6 Nitrided surfaces
- 4.5.7 Pin Holes in PVD coated piston ring surface
- 5 Loss of tangential force under temperature effects
- 6 Raised material caused by marking of rings
- 7 Machining of periphery and sides — Unintentional deviation from ideal profile and flatness
- 7.1 General
- 7.2 Permissible deviations for peripheral surface profile
- 7.2.1 Straight faced rings according to ISO 6622 (all parts) and ISO 6624 (all parts)
- 7.2.2 Straight faced rings without IW/IF according to ISO 6622 (all parts), ISO 6624-1 and ISO 6624-3
- 7.2.3 Straight faced rings with IW/IF according to ISO 6622 (all parts), ISO 6624-1 and ISO 6624-3 and straight faced rings according to ISO 6624-2 and ISO 6624-4
- 7.2.4 S, G, D and DV type oil control rings according to ISO 6625
- 7.2.5 SF type, coil spring loaded oil control rings according to ISO 6626, ISO 6626-2, and ISO 6626-3
- 7.3 Permissible side face unevenness
- 7.4 Permissible helix
- Bibliography [Go to Page]