ISO 6621-4:2015
Internal combustion engines — Piston rings — Part 4: General specifications
ISO 6621-4:2015 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 Standards). 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.
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Section sec_1
Section sec_2
Section sec_3
Section sec_4
Table tab_1
Section sec_5
Section sec_5.1
Section sec_5.1.1
Section sec_5.1.2
Section sec_5.1.3
Section sec_5.1.4
Section sec_5.2
Section sec_5.2.1
Section sec_5.2.2
Section sec_5.2.3
Section sec_6
Section sec_6.1
Section sec_6.2
Section sec_6.3
Section sec_6.3.1
Section sec_6.3.2
Section sec_7
Section sec_7.1
Table tab_2
Section sec_7.2
Section sec_7.3
Table tab_3
Section sec_7.4
Section sec_7.4.1
Section sec_7.4.2
Section sec_7.4.2.1
Table tab_4
Section sec_7.4.2.2
Section sec_7.4.2.3
Table tab_5
Section sec_7.4.2.4
Table tab_6
Section sec_7.4.3
Section sec_7.4.3.1
Section sec_7.4.3.1.1
Section sec_7.4.3.1.2
Section sec_7.4.3.2
Section sec_7.4.3.2.1
Section sec_7.4.3.2.2
Section sec_7.4.3.3
Section sec_7.4.3.3.1
Section sec_7.4.3.3.2
Section sec_7.4.3.4
Section sec_7.4.3.4.1
Section sec_7.4.3.4.2
Section sec_7.5
Section sec_7.5.1
Section sec_7.5.2
Section sec_7.5.3
Section sec_7.5.3.1
Section sec_7.5.3.1.1
Section sec_7.5.3.1.2
Section sec_7.5.3.2
Section sec_7.5.3.2.1
Section sec_7.5.3.2.2
Section sec_7.6
Section sec_7.6.1
Section sec_7.6.2
Section sec_7.6.2.1
Section sec_7.6.2.2
Section sec_8
Section sec_8.1
Figure fig_1
Table tab_7
Figure fig_2
Table tab_8
Section sec_8.2
Figure fig_3
Table tab_9
Section sec_9
Section sec_9.1
Table tab_10
Section sec_9.2
Section sec_9.3
Table tab_11
Section sec_10
Section sec_10.1
Section sec_10.1.1
Section sec_10.1.2
Table tab_12
Section sec_10.1.3
Section sec_10.1.4
Table tab_a
Figure fig_4
Table tab_13
Section sec_10.1.5
Table tab_b
Figure fig_5
Table tab_14
Section sec_10.1.6
Figure fig_6
Figure fig_7
Figure fig_8
Table tab_15
Section sec_10.1.7
Table tab_16
Section sec_10.1.8
Section sec_10.2
Section sec_10.2.1
Section sec_10.2.2
Section sec_10.2.3
Section sec_10.2.4
Table tab_17
Table tab_c
Figure fig_9
Section sec_10.2.5
Table tab_d
Figure fig_10
Table tab_18
Section sec_10.2.6
Table tab_e
Figure fig_11
Table tab_f
Figure fig_12
Table tab_19
Section sec_10.2.7
Table tab_20
Section sec_10.2.8
Section sec_10.3
Section sec_10.3.1
Section sec_10.3.2
Table tab_21
Section sec_10.3.3
Section sec_10.3.4
Table tab_22
Section sec_10.4
Section sec_10.4.1
Section sec_10.4.2
Section sec_10.4.3
Section sec_10.5
Section sec_10.5.1
Section sec_10.5.2
Section sec_10.5.3
Table tab_23
Section sec_10.5.4
Section sec_10.5.5
Table tab_24
Figure fig_13
Section sec_11
Section sec_11.1
Section sec_11.2
Section sec_11.3
Section sec_12
Reference ref_1
Reference ref_2
Reference ref_3
Reference ref_4
Reference ref_5
Reference ref_6
Reference ref_7
Reference ref_8
Reference ref_9
Reference ref_10
Reference ref_11
Reference ref_12
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Piston ring codes
5 Designation of piston rings
5.1 Designation elements and order
5.2 Designation examples
6 Marking of piston rings
6.1 General
6.2 Mandatory topside identification marking
6.3 Additional marking
7 General characteristics
7.1 Ring shape
7.2 Light tightness
7.3 Closed gap
7.4 Tangential force, Ft, and diametral force, Fd, of single piece piston rings
7.5 Tangential force Ft of multipiece oil control rings as specified in ISO 6626-1, ISO 6626-2, and ISO 6626-3
7.6 Tangential force Ft of expander/segment oil control rings as specified in ISO 6627
8 Notches for preventing ring rotation
8.1 Ring joint with internal notch (only for compression rings as specified in ISO 6622 and ISO 6624)
8.2 Ring joint with side notch (only for compression rings as specified in ISO 6622)
9 Machining of surfaces
9.1 Peripheral surfaces
9.2 Side faces
9.3 Other surfaces
10 Plated, coated, and treated surfaces
10.1 Chromium plating on peripheral surfaces
10.2 Spray coated peripheral surfaces
10.3 Nitrided surfaces
10.4 Treated surfaces
10.5 Physical vapour deposition coating (PVD)
11 Miscellaneous
11.1 Cleanliness
11.2 Corrosion protection
11.3 Packaging
12 Traceability (optional)
Bibliography
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Section sec_1
Section sec_2
Section sec_3
Section sec_4
Table tab_1
Section sec_5
Section sec_5.1
Section sec_5.1.1
Section sec_5.1.2
Section sec_5.1.3
Section sec_5.1.4
Section sec_5.2
Section sec_5.2.1
Section sec_5.2.2
Section sec_5.2.3
Section sec_6
Section sec_6.1
Section sec_6.2
Section sec_6.3
Section sec_6.3.1
Section sec_6.3.2
Section sec_7
Section sec_7.1
Table tab_2
Section sec_7.2
Section sec_7.3
Table tab_3
Section sec_7.4
Section sec_7.4.1
Section sec_7.4.2
Section sec_7.4.2.1
Table tab_4
Section sec_7.4.2.2
Section sec_7.4.2.3
Table tab_5
Section sec_7.4.2.4
Table tab_6
Section sec_7.4.3
Section sec_7.4.3.1
Section sec_7.4.3.1.1
Section sec_7.4.3.1.2
Section sec_7.4.3.2
Section sec_7.4.3.2.1
Section sec_7.4.3.2.2
Section sec_7.4.3.3
Section sec_7.4.3.3.1
Section sec_7.4.3.3.2
Section sec_7.4.3.4
Section sec_7.4.3.4.1
Section sec_7.4.3.4.2
Section sec_7.5
Section sec_7.5.1
Section sec_7.5.2
Section sec_7.5.3
Section sec_7.5.3.1
Section sec_7.5.3.1.1
Section sec_7.5.3.1.2
Section sec_7.5.3.2
Section sec_7.5.3.2.1
Section sec_7.5.3.2.2
Section sec_7.6
Section sec_7.6.1
Section sec_7.6.2
Section sec_7.6.2.1
Section sec_7.6.2.2
Section sec_8
Section sec_8.1
Figure fig_1
Table tab_7
Figure fig_2
Table tab_8
Section sec_8.2
Figure fig_3
Table tab_9
Section sec_9
Section sec_9.1
Table tab_10
Section sec_9.2
Section sec_9.3
Table tab_11
Section sec_10
Section sec_10.1
Section sec_10.1.1
Section sec_10.1.2
Table tab_12
Section sec_10.1.3
Section sec_10.1.4
Table tab_a
Figure fig_4
Table tab_13
Section sec_10.1.5
Table tab_b
Figure fig_5
Table tab_14
Section sec_10.1.6
Figure fig_6
Figure fig_7
Figure fig_8
Table tab_15
Section sec_10.1.7
Table tab_16
Section sec_10.1.8
Section sec_10.2
Section sec_10.2.1
Section sec_10.2.2
Section sec_10.2.3
Section sec_10.2.4
Table tab_17
Table tab_c
Figure fig_9
Section sec_10.2.5
Table tab_d
Figure fig_10
Table tab_18
Section sec_10.2.6
Table tab_e
Figure fig_11
Table tab_f
Figure fig_12
Table tab_19
Section sec_10.2.7
Table tab_20
Section sec_10.2.8
Section sec_10.3
Section sec_10.3.1
Section sec_10.3.2
Table tab_21
Section sec_10.3.3
Section sec_10.3.4
Table tab_22
Section sec_10.4
Section sec_10.4.1
Section sec_10.4.2
Section sec_10.4.3
Section sec_10.5
Section sec_10.5.1
Section sec_10.5.2
Section sec_10.5.3
Table tab_23
Section sec_10.5.4
Section sec_10.5.5
Table tab_24
Figure fig_13
Section sec_11
Section sec_11.1
Section sec_11.2
Section sec_11.3
Section sec_12
Reference ref_1
Reference ref_2
Reference ref_3
Reference ref_4
Reference ref_5
Reference ref_6
Reference ref_7
Reference ref_8
Reference ref_9
Reference ref_10
Reference ref_11
Reference ref_12
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Piston ring codes
5 Designation of piston rings
5.1 Designation elements and order
5.2 Designation examples
6 Marking of piston rings
6.1 General
6.2 Mandatory topside identification marking
6.3 Additional marking
7 General characteristics
7.1 Ring shape
7.2 Light tightness
7.3 Closed gap
7.4 Tangential force, Ft, and diametral force, Fd, of single piece piston rings
7.5 Tangential force Ft of multipiece oil control rings as specified in ISO 6626-1, ISO 6626-2, and ISO 6626-3
7.6 Tangential force Ft of expander/segment oil control rings as specified in ISO 6627
8 Notches for preventing ring rotation
8.1 Ring joint with internal notch (only for compression rings as specified in ISO 6622 and ISO 6624)
8.2 Ring joint with side notch (only for compression rings as specified in ISO 6622)
9 Machining of surfaces
9.1 Peripheral surfaces
9.2 Side faces
9.3 Other surfaces
10 Plated, coated, and treated surfaces
10.1 Chromium plating on peripheral surfaces
10.2 Spray coated peripheral surfaces
10.3 Nitrided surfaces
10.4 Treated surfaces
10.5 Physical vapour deposition coating (PVD)
11 Miscellaneous
11.1 Cleanliness
11.2 Corrosion protection
11.3 Packaging
12 Traceability (optional)
Bibliography