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BS ISO 6621-4:2024

BS ISO 6621-4:2024

$167.15

Internal combustion engines. Piston rings – General specifications

Published By Publication Date Number of Pages
BSI 2024 38
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PDF Catalog

PDF Pages PDF Title
2 undefined
7 Foreword
8 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
4 Piston ring codes
12 5 Designation of piston rings
5.1 Designation elements and order
5.1.1 General
5.1.2 Mandatory elements
13 5.1.3 Measurement principles
5.1.4 Additional elements
5.1.5 Elements for additional marking
5.2 Designation examples
5.2.1 Designation example of a piston ring in accordance with ISO 6622-1
5.2.2 Designation example of a piston ring in accordance with ISO 6624-1
14 5.2.3 Designation example of a piston ring in accordance with ISO 6626-1
6 Designation of piston rings
6.1 General
6.2 Mandatory topside identification marking
15 6.3 Additional marking
7 General characteristics
7.1 Ring shape
16 7.2 Light tightness
7.3 Closed gap
7.4 Tangential force, Ft, and diametral force, Fd, of single piece piston rings
7.4.1 Calculation of Ft, and Fd values in dimension tables of dimensional standards
17 7.4.2 Correction of Ft, and Fd values
18 7.4.3 Examples for correction of Ft and Fd
20 7.5 Tangential force Ft of multipiece oil control rings as specified in ISO 6626-1, ISO 6626-2, and ISO 6626-3
7.5.1 General
7.5.2 Rounding of values
7.5.3 Examples for calculating tangential force Ft
21 7.6 Tangential force Ft of expander/rail oil control rings as specified in ISO 6627
7.6.1 General
7.6.2 Example for calculating the tangential force Ft ā€” Selected type of piston ring: ISO 6627 ā€“ES3 ā€“ 85 Ɨ 3 ā€“ MC67 MC68/CR1 PNH
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)
23 8.2 Ring joint with side notch (only for compression rings as specified in ISO 6622)
24 9 Machining of surfaces
9.1 Peripheral surfaces
9.2 Side faces
9.3 Other surfaces
25 10 Plated, coated, and treated surfaces
10.1 Chromium plating on peripheral and side surfaces
10.1.1 General
10.1.2 Chromium plating thickness
10.1.3 Chromium plated rings of fully faced design
10.1.4 Chromium plated rings of semi-inlaid design
26 10.1.5 Chromium plated rings of inlaid design
27 10.1.6 Side Chromium plated rings design
10.1.7 Radius, chamfer and dimensions of peripheral edges of chromium plated rings
28 10.1.8 Peripheral edges at the gap of chromium plated rings and rails
29 10.1.9 Hardness of chromium plating
10.2 Spray-coated peripheral surfaces
10.2.1 Codes
10.2.2 Spray-coating thickness
10.2.3 Spray-coated rings of fully faced design
10.2.4 Spray-coated rings of semi-inlaid design
30 10.2.5 Spray-coated rings of inlaid design
31 10.2.6 Radius, chamfer of peripheral edges of spray-coated rings
10.2.7 Peripheral edges at gap of spray-coated rings
32 10.2.8 Hardness of spray-coating
10.3 Nitride surfaces
10.3.1 Codes
10.3.2 Nitride case depth
33 10.3.3 Radius and dimensions of outside and inside edges of nitride steel rings
10.3.4 Peripheral edges at the gap of nitride steel rings and rails
34 10.4 Treated surfaces
10.4.1 Ferro-oxidized all over ā€” Code FE ā€” Coating thickness (0,001 to 0,005) mm
10.4.2 Phosphated all over ā€” Code PO ā€” Coating thickness 0,002 mm min.
10.4.3 Phosphated all over ā€” Code PR ā€” Coating thickness 0,002 mm max.
10.5 Physical vapour deposition coating (PVD)
10.5.1 Codes
10.5.2 PVD coating
10.5.3 PVD coating thickness
10.5.4 Hardness of PVD coating
35 10.5.5 Peripheral edges at the gap of PVD-coated rings and rails
11 Miscellaneous
11.1 Cleanliness
11.2 Corrosion protection
11.3 Packaging
12 Traceability (optional)
36 Bibliography

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BS ISO 6621-4:2024
$167.15