ISO/DIS 6622-1

Internal combustion engines -- Piston rings

Moteurs à combustion interne -- Segments de piston

Standards Content (sample)

DRAFT INTERNATIONAL STANDARD
ISO/DIS 6622-1
ISO/TC 22/SC 34 Secretariat: ANSI
Voting begins on: Voting terminates on:
2020-04-03 2020-06-26
Internal combustion engines — Piston rings —
Part 1:
Rectangular rings made of cast iron
Moteurs à combustion interne — Segments de piston —
Partie 1: Segments rectangulaires en fonte moulée
ICS: 27.020
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
This document is circulated as received from the committee secretariat.
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 6622-1:2020(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION. ISO 2020
---------------------- Page: 1 ----------------------
ISO/DIS 6622-1:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Fax: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/DIS 6622-1:2020(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope (mandatory) ............................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Overview ....................................................................................................................................................................................................................... 1

4 Ring types and designation examples ............................................................................................................................................ 1

4.1 Type R — Straight faced rectangular ring ....................................................................................................................... 1

4.1.1 General features................................................................................................................................................................ 1

4.1.2 Designation ........................................................................................................................................................................... 2

4.2 Type B — Barrel faced rectangular ring ........................................................................................................................... 2

4.2.1 General features................................................................................................................................................................ 2

4.2.2 Designation ........................................................................................................................................................................... 4

4.3 Type BA — Asymmetrical barrel faced rectangular ring h ≥ 1,5 mm .................................................... 4

4.3.1 General features................................................................................................................................................................ 4

4.3.2 Designation ........................................................................................................................................................................... 5

4.4 Type M — Taper faced rectangular ring ........................................................................................................................... 6

4.4.1 General features................................................................................................................................................................ 6

4.4.2 Designation ........................................................................................................................................................................... 7

5 Common features ................................................................................................................................................................................................. 7

5.1 Face Coating Types .............................................................................................................................................................................. 7

5.2 Face Shape Types .................................................................................................................................................................................. 7

5.3 Piston Ring Twist Features ........................................................................................................................................................... 7

5.3.1 Taper faced rectangular ring with partly cylindrical machined (LM) or

lapped (LP) peripheral surface............................................................................................................................ 9

5.4 Chamfered edges ................................................................................................................................................................................10

5.5 Type R, B, BA and M rings (fully faced, semi-inlaid and inlaid) — Plating/coating

thickness ....................................................................................................................................................................................................11

5.6 Type R, B, BA, and M rings — Nitrided case depth ...............................................................................................12

6 Force factors ...........................................................................................................................................................................................................13

7 Dimensions ..............................................................................................................................................................................................................13

Bibliography .............................................................................................................................................................................................................................26

© ISO 2020 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO/DIS 6622-1:2020(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment,

as well as information about ISO's adherence to the World Trade Organization (WTO) principles in the

Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html.

The committee responsible for this document is Technical Committee [or Project Committee] ISO/TC

[or ISO/PC] ###, [name of committee], Subcommittee SC ##, [name of subcommittee].

This second/third/… edition cancels and replaces the first/second/… edition (ISO #####:####), which

has been technically revised.
The main changes compared to the previous edition are as follows:
— xxx xxxxxxx xxx xxxx
A list of all parts in the ISO ##### series can be found on the ISO website.
iv © ISO 2020 – All rights reserved
---------------------- Page: 4 ----------------------
ISO/DIS 6622-1:2020(E)
Introduction

ISO 6622 is one of a number of series of International Standards dealing with piston rings

[2], [3], [4], [5] [6]
for reciprocating internal combustion engines. Others are ISO 6621 , ISO 6623 ,
[7], [8], [ ], [10] [11] [12], [13] [14]
ISO 6624 9 , ISO 6625 , ISO 6626 and ISO 6627 .

The common features and dimensional tables presented in this part of ISO 6622 constitute a broad

range of variables and, in selecting a particular ring type, the designer must bear in mind the conditions

under which it will be required to operate.
[4]

It is also essential that the designer refer to the specifications and requirements of ISO 6621-3 and

ISO 6621-4 before completing selection.
Identification of patent holders, if any.
© ISO 2020 – All rights reserved v
---------------------- Page: 5 ----------------------
DRAFT INTERNATIONAL STANDARD ISO/DIS 6622-1:2020(E)
Internal combustion engines — Piston rings —
Part 1:
Rectangular rings made of cast iron
1 Scope (mandatory)

This part of ISO 6622 specifies the essential dimensional features of rectangular rings made of cast

iron, Types R, B, BA and M, having diameters up to and including 200 mm, used in reciprocating internal

combustion piston engines. It is also applicable to piston rings of compressors working under similar

conditions.
2 Normative references

The following referenced documents are indispensable for the application of this document. For dated

references, only the edition cited applies. For undated references, the latest edition of the referenced

document (including any amendments) applies.
ISO 6621-1, Internal combustion engines — Piston rings — Part 1: Vocabulary

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

3 Overview

The rectangular ring types are specified in Tables 1 to 3 and Figures 1 to 4. Their common features and

the dimensions of those features are specified in Tables 4 to 9 and Figures 5 to 11. Tables 10 and 11 give

the force factors for the different ring types, while Tables 12 and 13 give the dimensions and forces of

rectangular rings of radial wall thickness regular and thicker “D/22”, respectively.

4 Ring types and designation examples
4.1 Type R — Straight faced rectangular ring
4.1.1 General features
See Table 12 or 13 for dimensions and forces.
© ISO 2020 – All rights reserved 1
---------------------- Page: 6 ----------------------
ISO/DIS 6622-1:2020(E)
Key
1 reference plane
t = 0,005 × h .
Figure 1 — Type R
4.1.2 Designation

EXAMPLE Designation of a piston ring complying with the requirements of ISO 6622-1, being a rectangular

ring made of cast iron, with a straight faced peripheral surface (R), of nominal diameter d = 90 mm (90), of

nominal ring width h = 2,5 mm (2,5), made of non-heat treated grey cast iron, subclass 12 (MC12), phosphated

on all sides (PO):
Piston ring ISO 6622-1 R 90 × 2,5 - MC12/PO
4.2 Type B — Barrel faced rectangular ring
4.2.1 General features
See Table 12 or 13 for dimensions and forces.
2 © ISO 2020 – All rights reserved
---------------------- Page: 7 ----------------------
ISO/DIS 6622-1:2020(E)
Key
1 reference plane
See Table 1.
Figure 2 — Type B
© ISO 2020 – All rights reserved 3
---------------------- Page: 8 ----------------------
ISO/DIS 6622-1:2020(E)
Table 1 — Gauge width (h ) and barrel dimensions for symmetrical barrel faced
compression rings
Dimensions in millimetres
a b c
h h h h tolerance h t , t h
1 25 26 26 27 2 3 8
1,2 0,30 0,60 ± 0,20 0,90 0,002...0,012 0,60
1,5 0,35 0,75 ± 0,25 1,15 0,80
1,75 0,35 0,85 ± 0,30 1,35 1,00
0,003...0,015
2,0 0,40 1,00 ± 0,30 1,60 1,20
2,5 0,45 1,25 ± 0,40 2,05 1,60
3,0 0,50 1,50 ± 0,50 2,50 2,00
0,005...0,020
3,5 0,55 1,75 ± 0,50 2,95 2,40
4,0 0,60 2,00 ± 0,60 3,40 2,80
0,005...0,023
4,5 0,65 2,25 ± 0,60 3,85 3,20
h may be lowered for rings with reduced edge dimensions.
t and/or t can be changed as agreed between edge dimensions.
2 3

Gauge width (h ) only informative; may be used only if agreed between manufacturer and client.

4.2.2 Designation

EXAMPLE Designation of a piston ring complying with the requirements of ISO 6622-1, being a rectangular

ring made of cast iron, with a barrel faced peripheral surface (B), of nominal diameter d = 90 mm (90), of nominal

width h = 2,5 mm (2,5), made of heat-treated martensitic spheroidal graphite cast iron, subclass 51 (MC51), with

a chromium plated coating on the peripheral surface, and of minimum thickness 0,15 mm (CR3):

Piston ring ISO 6622-1 - B 90 × 2,5 - MC51/CR3
4.3 Type BA — Asymmetrical barrel faced rectangular ring h ≥ 1,5 mm
4.3.1 General features
See Table 12 or 13 for dimensions and forces.
4 © ISO 2020 – All rights reserved
---------------------- Page: 9 ----------------------
ISO/DIS 6622-1:2020(E)
Key
1 reference plane
2 top side identification mark
Figure 3 — Type BA
Table 2 — Asymmetrical barrel dimensions
Dimensions in millimetres
a b b
h h h h tol. h t t
1 25 26 26 27 2 3
0,20 0,35 0,80
1,2 ± 0,15 0,005…0,016
0…0,005
0,28 0,43 0,90
1,5 0,35 0,50 ± 0,15 1,15 0,007…0,022
1,75 0,35 0,55 1,35 0,008…0,025
± 0,20 0…0,007
2,0 0,40 0,60 1,50 0,009…0,030
2,5 0,45 0,70 1,80 0,011…0,035
± 0,25 0…0,008
3,0 0,55 0,80 2,10 0,012…0,038
3,5 0,60 0,90 2,40 0,012…0,040
± 0,30 0…0,009
4,0 0,65 0,95 2,80 0,013... 0,045
4,5 0,70 1,05 ± 0,35 3,20 0…0,010 0,015... 0,050
h may be lowered for rings with reduced edge dimensions.
t and/or t may be varied as agreed between manufacturer and client.
2 3
Recommended for bottom edge smaller than 0,2 mm.
4.3.2 Designation

EXAMPLE Designation of a piston ring complying with the requirements of ISO 6622-1, being a rectangular

ring made of cast iron, with an asymmetrical barrel faced peripheral surface (BA), of nominal diameter

d = 90 mm (90), of nominal width h = 2,5 mm (2,5), made of heat-treated martensitic spheroidal graphite

1 1

cast iron subclass 51 (MC51), and having a chromium plated coating on the peripheral surface with a minimum

thickness of 0,15 mm (CR3):
Piston ring ISO 6622-1 BA 90 × 2,5 - MC51/CR3
© ISO 2020 – All rights reserved 5
---------------------- Page: 10 ----------------------
ISO/DIS 6622-1:2020(E)
4.4 Type M — Taper faced rectangular ring
4.4.1 General features
See Table 12 or 13 for dimensions and forces.
Key
1 reference plane
2 top side identification mark
Figure 4 — Type M
Table 3 — Taper
Dimensions in minutes

Uncoated rings with peripheral surface turned and chromium plated or spray coated rings with

peripheral surface ground and chromium plated rings with surface not ground
Code
b b, c
with IF or IW (top side) with IFU or IWU (bottom side)
Taper Tolerance
Taper Tolerance Taper Tolerance
+40
M1 10 10 — —
M2 30 30 — —
+60
M3 60 60 0 60
+50
+60
M4 90 90 90
M5 120 120 120

For chromium plated rings with tapered peripheral surface not ground, the tolerance shall be increased by 10

+60 +70

(e.g. M3 = 60: for M rings or for M rings (negative twist type) with IF or IW and IFU or IWU).

0 0
IF and IW, and IFU and IWU, are explained in Figures 10 to 13.

M1 should not be used for rings of width < 1,5 mm or for those with a partly cylindrical peripheral surface.

For M rings (negative twist type) M3, M4 and M5, the twist angle should not exceed 90 % of the minimum taper angle.

6 © ISO 2020 – All rights reserved
---------------------- Page: 11 ----------------------
ISO/DIS 6622-1:2020(E)
4.4.2 Designation

EXAMPLE Designation of a piston ring complying with the requirements of ISO 6622-1, being a rectangular

ring made of cast iron, with a 10’ taper faced peripheral surface (M1), of diameter d = 90 mm (90), of nominal

width h = 2,5 mm (2,5), made of heat treated grey cast iron, subclass 23 (MC23) and having an inlaid spray

coating on the peripheral surface with a minimum thickness of 0,1 mm (SC2F):
Piston ring ISO 6622-1 M1 90 × 2,5 - MC23/SC2F
5 Common features
5.1 Face Coating Types
Figure 5 shows the types of piston ring face coatings
a. Uncoated b. Fully Faced c. Semi Inlaid d. Inlaid
Reference Tables 8 and 9 for coating thicknesses
Figure 5 — Piston Ring Face Types
5.2 Face Shape Types
Figure 6 shows the types of piston ring face shapes
a. Type R b. Type B c. Type BA d. Type M
Straight Faced Barrel Faced Asymmetrical barrel Taper faced
faced
Figure 6 — Types Piston Ring Face Shapes
5.3 Piston Ring Twist Features

When the standard twist of 0,01/0,05 for rings ≤ 2 mm axial width and 0,01/0,04 for rings > 2 mm axial

width per 2 mm of radial ring thickness is specified, the dimension a , the angle φ and the width of the

bevel are at the discretion of the manufacturer. In such cases, the design should correspond to one or

the other of the designs shown in Figures 7 and 8.
Figure 7 shows the types of piston ring positive twist features
© ISO 2020 – All rights reserved 7
---------------------- Page: 12 ----------------------
ISO/DIS 6622-1:2020(E)
Dimensions in millimetres
a. Type IF b. Type IFV c. Type IW
Internal bevel top side Variable internal bevel on the Internal step top side
top side
Reference Tables 4 and 5 for dimensions
1 top side identification mark
Figure 7 — Types Piston Ring Positive Twist Features
Figure 8 shows the types of piston ring negative twist features
Dimensions in millimetres
a. Type IFU a. Type IFVU c. Type IWU

Internal bevel bottom side Variable internal bevel on the Internal step bottom side

bottom side
Reference Tables 4 and 5 for dimensions
1 top side identification mark see Table 3
Figure 8 — Types Piston Ring Negative Twist Features
Table 4 — a , h and h dimensions for rings h < 1,5 mm
3 18 19 1
Dimensions in millimetres
a h , h
3 18 19
Tolerance Tolerance
0 0
30 ≤ d < 60 0,85 × a 0,6 × h
1 1 1
−02, −02, 5
Dimension does not apply for IF and IFU rings because h is specified for
this feature.
8 © ISO 2020 – All rights reserved
---------------------- Page: 13 ----------------------
ISO/DIS 6622-1:2020(E)
Table 4 (continued)
a h , h
3 18 19
Tolerance Tolerance
0 0
60 ≤ d ≤ 90 0,9 × a 0,6 × h
1 1 1
−03, −02, 5
Dimension does not apply for IF and IFU rings because h is specified for
this feature.
Table 5 — a and h dimensions for rings h ≥ 1,5mm
3 18 1
Dimensions in millimetres
a h
3 18
Tolerance Tolerance
0 0
30 ≤ d < 80 0,8 × a 0,6 × h
1 1 1
−02, −02, 5
0 0
80 ≤ d < 100 0,8 × a 0,6 × h
1 1 1
−03, −02, 5
0 0
100 ≤ d < 150 0,8 × a 0,6 × h
1 1 1
−03, −03, 5
0 0
150 ≤ d ≤ 200 0,8 × a 0,6 × h
1 1 1
−04, −04, 5

5.3.1 Taper faced rectangular ring with partly cylindrical machined (LM) or lapped (LP)

peripheral surface
Figure 9 shows a partly cylindrical machines or lapped Type M ring.
Key
1 top side identification mark
Figure 9 — Partly cylindrical machined or lapped Type M rings
Table 6 — Axial dimensions of the cylindrical part of peripheral surface h
Dimensions in millimetres
h h h
1 24 24
max. max.
each side of gap up to 30°
1,2 0,4 0,8
1,5 0,5 1,0
1,75 0,6 1,2
2,0 0,7 1,4
2,5 0,8 1,6
3,0 1,0 2,0
Partly cylindrical peripheral surface shall be visible.
© ISO 2020 – All rights reserved 9
---------------------- Page: 14 ----------------------
ISO/DIS 6622-1:2020(E)
Table 6 (continued)
h h h
1 24 24
max. max.
each side of gap up to 30°
3,5 1,2 2,3
4,0 1,3 2,6
4,5 1,5 3,0
Partly cylindrical peripheral surface shall be visible.
5.4 Chamfered edges

Outside chamfered edges (KA) are shown in Figure 10. Inside chamfered edges (KI) are shown in Figure

11. KA and KI dimensions are shown in Table 7.
a) Chamfer with step for nominal b) Chamfer KA
KA ≥ 0,3
NOTE KA applies to uncoated rings only
Figure 10 — Outside chamfered edges, KA
10 © ISO 2020 – All rights reserved
---------------------- Page: 15 ----------------------
ISO/DIS 6622-1:2020(E)
Figure 11 — Inside chamfered edges, KI
Table 7 — KA and KI dimensions
Dimensions in millimetres
d KA KI
30 ≤ d < 50 ≤ 0,2 ≤ 0,2
50 ≤ d < 125 0,3 ± 0,1 0,3 ± 0,15
125 ≤ d < 175 0,4 ± 0,1 0,4 ± 0,15
175 ≤ d ≤ 200 0,5 ± 0,1 0,6 ± 0,20

5.5 Type R, B, BA and M rings (fully faced, semi-inlaid and inlaid) — Plating/coating

thickness
Figure 12 — Plating/coating thickness
© ISO 2020 – All rights reserved 11
---------------------- Page: 16 ----------------------
ISO/DIS 6622-1:2020(E)
Table 8 — Plating/spray coating thickness
Dimensions in millimetres
Chromium plating Spray coating Thickness
code code min.
CRF — 0,005
CR1 SC1 0,050
CR2 SC2 0,100
a a
CR3 SC3 0,150
a a
CR4 SC4 0,200
Not recommended for rings h ≤ 1,2.
Table 9 — PVD coating thickness
Dimensions in millimetres
Code Peripheral surface
min.
PC001 0,001
PC003 0,003
PC006 0,006
PC010 0,010
PC020 0,020
PC030 0,030
PC040 0,040
Not applicable to diamond-like carbon (DLC) coatings.
5.6 Type R, B, BA, and M rings — Nitrided case depth
Figure 13 — Nitrided case depth
Table 10 — Nitrided case depth
Dimensions in millimetres
Nitrided case depth min.
Code
Peripheral surface Side faces
NT030 0,03 0,010
NT050 0,05 0,015
NT070 0,07 0,020
NT090 0,09 0,020
NT110 0,11 0,030
NT130 0,13 0,030
12 © ISO 2020 – All rights reserved
---------------------- Page: 17 ----------------------
ISO/DIS 6622-1:2020(E)
6 Force factors

The tangential and diametral forces given in Tables 12 and 13 shall be corrected when additional

features and/or materials other than grey cast iron with a modulus of elasticity of 100 GN/m are being

used. For common features, the multiplier correction factors given in Tables 10 and 11 and the force

correction factors given in ISO 6621-4 shall be used. The factors of Table 11 have been calculated with

mean plating/coating thickness.

Table 11 — Force correction factors for R, B, BA and M rings with features KA, KI, IF, IW, IFU and

IWU
Factor
KA KI Taper IF IW
IFU IWU
M2 or M4 or
M3 M5
30 ≤ d < 50 1 1 0,97 0,93 0,88 0,75
50 ≤ d < 200 0,97 0,97 0,98 0,96 0,88 0,78

Note The Force correction factors for IFV and IFVU must be calculated based on the design.

Table 12 — Force correction factors for chromium plated or spray coated R, B, BA and M rings

(fully faced, semi-inlaid and inlaid types)
Factor
CRF/PC001…
mm CR1/PC040 CR2/SC1 CR3/SC2 CR4/SC3 SC4
PC030
30 ≤ d < 50 1 0,81 0,70 0,64 — —
50 ≤ d < 75 1 0,90 0,85 0,81 0,75 0,71
75 ≤ d < 100 1 0,92 0,88 0,85 0,81 0,77
100 ≤ d < 125 1 0,94 0,91 0,88 0,86 0,83
125 ≤ d < 150 1 0,95 0,92 0,90 0,88 0,85
150 ≤ d ≤ 200 1 0,96 0,93 0,91 0,89 0,87
7 Dimensions
See Tables 13 and 14.
© ISO 2020 – All rights reserved 13
---------------------- Page: 18 ----------------------
ISO/DIS 6622-1:2020(E)
14 © ISO 2020 – All rights reserved

Table 13 — Dimensions of R, B, BA and M rectangular rings — Radial wall thickness “regular”

Dimensions in millimetres

Nominal Radial wall thick- Ring width Closed gap Tangential force Diametral force

diameter ness “regular”
h s F F
1 1 t d
d a N N
1 1

Tolerance Column Tolerance Tolerance For h shown in column Tolerance For h shown in column Tolerance

1 1
1 2 3 4 5 1 2 3 4 5 1 2 3 4 5
30 1,25 6,0 7,5 8,6 9,9 12,5
31 1,30 6,2 8,0 9,2 10,5 13,1
32 1,35 6,7 8,2 9,7 11,0 13,8
33 1,40 6,9 8,6 10,1 11,6 14,6
34 1,40 6,5 8,2 9,5 11,0 13,8
35 1,45 6,9 8,6 10,1 11,4 14,4
36 1,50 7,1 9,0 10,5 12,0 15,1
37 1,55 7,5 9,5 11,0 12,7 15,7
38 1,60 7,7 9,9 11,4 13,1 16,6
39 1,65 8,2 10,3 12,0 13,8 17,2
— — — — —
40 1,65 7,7 9,7 11,4 13,1 16,3
−0,010
± 0,15
−0,025
± 30 % if ± 30 % if
41 1,70 8,2 10,1 11,8 13,5 17,0
For
Within F < 10 N F < 21,5 N
t d
+02,
42 1,75 1,2 1,5 1,75 2 2,5 0,15 8,4 10,5 12,3 14,2 17,6
phosphate
a ring: PO surface: ± 20 % if ± 20 % if
43 1,80 8,8 11,0 12,9 14,6 18,3
F ≥ 10 N F ≥ 21,5 N
t d
−0,005
0,15 max.
−0,025
44 1,85 9,0 11,4 13,3 15,3 19,1
45 1,90 9,2 11,8 13,8 15,7 19,6
46 1,90 9,0 11,2 13,1 15,1 18,7
47 1,95 9,2 11,6 13,5 15,5 19,4
48 2,00 9,7 12,0 14,0 16,1 20,2
49 2,05 9,9 12,5 14,6 16,6 20,9
50 2,10 4,8 6,0 7,0 8,0 10,0 10,3 12,9 15,1 17,2 21,5
51 2,15 4,9 6,2 7,2 8,3 10,3 10,5 13,3 15,5 17,8 22,1
52 2,15 4,7 5,9 6,9 7,9 9,9 10,1 12,7 14,8 17,0 21,3
53 2,20 4,9 6,1 7,2 8,2 10,3 10,5 13,1 15,5 17,6 22,1
54 2,25 5,0 6,3 7,4 8,5 10,6 10,8 13,5 15,9 18,3 22,8
---------------------- Page: 19 ----------------------
ISO/DIS 6622-1:2020(E)
© ISO 2020 – All rights reserved 15
Table 13 (continued)

Nominal Radial wall thick- Ring width Closed gap Tangential force Diametral force

diameter ness “regular”
h s F F
1 1 t d
d a N N
1 1

Tolerance Column Tolerance Tolerance For h shown in column Tolerance For h shown in column Tolerance

1 1
1 2 3 4 5 1 2 3 4 5 1 2 3 4 5
55 2,30 5,2 6,5 7,6 8,7 10,9 11,2 14,0 16,3 18,7 23,4
−0,010
−0,025
56 2,35 5,4 6,7 7,8 9,0 11,2 11,6 14,4 16,8 19,4 24,1
For
57 2,40 0,15 5,5 6,9 8,1 9,2 11,6 11,8 14,8 17,4 19,8 24,9
phosphate
PO surface:
58 2,40 5,3 6,7 7,8 8,9 11,2 11,4 14,4 16,8 19,1 24,1
−0,005
−0,025
59 2,45 5,5 6,9 8,0 9,2 11,5 11,8 14,8 17,2 19,8 24,7
60 2,50 5,6 7,0 8,2 9,4 11,7 12,0 15,1 17,6 20,2 25,2
61 2,55 5,7 7,2 8,4 9,6 12,1 12,3 15,5 18,1 20,6 26,0
62 2,60 5,9 7,4 8,6 9,9 12,4 12,7 15,9 18,5 21,3 26,7
63 2,65 6,1 7,6 8,9 10,1 12,7 13,1 16,3 19,1 21,7 27,3
64 2,65 5,9 7,3 8,6 9,8 12,3 12,7 15,7 18,5 21,1 26,4
+02,
65 2,70 6,0 7,5 8,8 10,1 12,6 12,9 16,1 18,9 21,7 27,1
± 0,15
± 30 % if ± 30 % if
66 2,75 6,2 7,7 9,0 10,3 12,9 13,3 16,6 19,4 22,1 27,7
Within F < 10 N F < 21,5 N
t d
67 2,80 1,2 1,5 1,75 2 2,5 0,2 6,3 7,9 9,3 10,6 13,3 13,3 17,0 20,0 22,8 28,6
a ring: ± 20 % if ± 20 % if
−0,010
68 2,85 6,5 8,1 9,5 10,9 13,6 14,0 17,4 20,4 23,4 29,2
F ≥ 10 N F ≥ 21,5 N
−0,030
t d
0,15 max.
For
69 2,90 6,6 8,3 9,7 11,1 13,9 14,2 17,8 20,9 23,9 29,9
phosphate
70 2,90 PO surface: 6,4 8,1 9,4 10,8 13,5 13,8 17,4 20,2 23,2 29,0
−0,005
71 2,95 6,6 8,3 9,7 11,1 13,8 14,2 17,8 20,9 23,9 29,7
−0,030
72 3,00 6,7 8,5 9,9 11,3 14,2 14,4 18,3 21,3 24,3 30,5
73 3,05 6,9 8,6 10,1 11,6 14,5 14,8 18,5 21,7 24,9 31,2
74 3,10 7,1 8,8 10,3 11,8 14,8 15,3 18,9 22,1 25,4 31,8
75 3,15 7,2 9,0 10,5 12,0 15,1 15,5 19,4 22,6 25,8 32,5
76 3,15 7,0 8,8 10,2 11,7 14,7 15,1 18,9 21,9 25,2 31,6
+02, 5
77 3,20 0,25 7,1 8,9 10,5 12,0 15,0 15,3 19,1 22,6 25,8 32,3
78 3,25 7,3 9,1 10,7 12,2 15,3 15,7 19,6 23,0 26,2 32,9
79 3,30 7,4 9,3 10,9 12,5 15,6 15,9 20,0 23,4 26,9 33,5
---------------------- Page: 20 ----------------------
ISO/DIS 6622-1:2020(E)
16 © ISO 2020 – All rights reserved
Table 13 (continued)

Nominal Radial wall thick- Ring width Closed gap Tangential force Diametral force

diameter ness “regular”
h s F F
1 1 t d
d a N N
1 1

Tolerance Column Tolerance Tolerance For h shown in column Tolerance For h shown in column Tolerance

1 1
1 2 3 4 5 1 2 3 4 5 1 2 3 4 5
80 3,35 7,6 9,5 11,1 12,7 16,0 16,3 20,4 23,9 27,3 34,4
81 3,40 7,8 9,7 11,4 13,0 16,3 16,8 20,9 24,5 28,0 35,0
82 3,40 7,6 9,5 11,1 12,7 15,9 16,3 20,4 23,9 27,3 34,2
83 3,45 7,7 9,7 11,3 12,9 16,2 16,6 20,9 24,3 27,7 34,8
84 3,50 7,9 9,9 11,5 13,2 16,5 17,0 21,3 24,7 28,4 35,5
1,2 1,5 1,75 2 2,5 0,25
85 3,55 8,0 10,1 11,8 13,5 16,8 17,2 21,7 25,4 29,0 36,1
86 3,60 8,2 10,3 12,0 13,7 17,2 17,6 22,1 25,8 29,5 37,0
87 3,65 8,3 10,4 12,2 14,0 17,5 17,8 22,4 26,2 30,1 37,6
−0,010
± 0,15
88 3,65 8,1 10,2 11,9 13,6 17,1 17,4 21,9 25,6 29,2 36,8
−0,030
For
89 3,70 Within 8,3 10,4 12,2 13,9 17,4 17,8 22,4 26,2 29,9 37,4
phosphate
90 3,75 a ring: PO surface: 12,3 14,1 17,6 21,2 26,4 30,3 37,8 45,6
± 30 % if ± 30 % if
−0,005
91 3,80 12,5 14,3 18,0 21,6 26,9 30,7 38,7 46,4
0,15 max.
−0,030 F < 10 N F < 21,5 N
t d
+02, 5
92 3,85 12,8 14,6 18,3 22,0 27,5 31,4 39,3 47,3
± 20 % if ± 20 % if
93 3,90 13,0 14,9 18,6 22,4 28,
...