ISO 6626-3:2008

INTERNATIONAL ISO
STANDARD 6626-3
First edition
2008-06-15

Internal combustion engines — Piston
rings —
Part 3:
Coil-spring-loaded oil control rings made
of steel
Moteurs à combustion interne — Segments de piston —
Partie 3: Segments racleurs régulateurs d'huile, en acier, mis en charge
par ressort hélicoïdal




Reference number
ISO 6626-3:2008(E)
©
ISO 2008

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ISO 6626-3:2008(E)
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ii © ISO 2008 – All rights reserved

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ISO 6626-3:2008(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Symbols . 1
4 Piston ring types and designation examples . 2
4.1 Type SOR — Steel oil control rings with R-shaped groove . 2
4.2 Type SOV — Steel oil control rings with V-shaped groove. 3
5 Common features . 4
5.1 Ring width h and radial wall thickness a . 4
1 1
5.2 Land width h . 5
5
5.3 Land angle α, β. 5
5.4 Land spacing B . 6
3
5.5 Slot sizes . 6
5.6 Nitrided surface. 7
5.7 Nominal contact pressure and tangential force . 7
5.8 Tolerance of tangential force F . 7
t
6 Coil springs . 8
6.1 Types of coil spring. 8
6.2 Coil-spring excursion (extended gap) . 10
6.3 Position of coil spring gap and fixing. 10
6.4 Material . 10
7 Type SOR. 11
8 Type SOV . 11
9 Dimensions. 12
Bibliography . 20

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ISO 6626-3:2008(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 6626-3 was prepared by Technical Committee ISO/TC 22, Road vehicles.
ISO 6626 consists of the following parts, under the general title Internal combustion engines — Piston rings:
1)
⎯ Coil-spring-loaded oil control rings
⎯ Part 2: Coil-spring-loaded oil control rings of narrow width made of cast iron
⎯ Part 3: Coil-spring-loaded oil control rings made of steel

1) ISO 6626:1989, published without a part number, is regarded as the first part of the ISO 6626 series since publication
of the other parts.
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ISO 6626-3:2008(E)
Introduction
ISO 6626 is one of a series of International Standards dealing with piston rings for reciprocating internal
combustion engines. Others are ISO 6621, ISO 6622, ISO 6623, ISO 6624, ISO 6625 and ISO 6627
(see Clause 2 and Bibliography).
The common features and dimensional tables presented in this part of ISO 6626 constitute a broad range of
variables and, in selecting a particular ring type, the designer will bear in mind the conditions under which it
will be required to operate.

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INTERNATIONAL STANDARD ISO 6626-3:2008(E)

Internal combustion engines — Piston rings —
Part 3:
Coil-spring-loaded oil control rings made of steel
1 Scope
This part of ISO 6626 specifies the essential dimensions of coil-spring-loaded, nitrided oil control rings made
of steel, of piston ring types SOR (with R-shaped groove) and SOV (with V-shaped groove).
This part of ISO 6626 applies to coil-spring-loaded, nitrided oil control rings made of steel with a diameter of
between 60 mm and 200 mm inclusive for reciprocating internal combustion engines. It can also be used for
piston rings of compressors working under analogous 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 6621-4, Internal combustion engines — Piston rings — Part 4: General specifications
3 Symbols
The following symbols are used in this part of ISO 6626.
NOTE These symbols (including associated indices) are in accordance with the symbols used in ISO 6621, ISO 6622,
ISO 6623, ISO 6624, ISO 6625, ISO 6627 and other parts of ISO 6626.
a radial wall thickness
1
a groove depth
4
a radial thickness over coil spring
12
a groove depth and bridge
13
a external land depth
14
B land spacing
3
c slot width
1
d nominal diameter (nominal bore diameter)
1
d coil-spring diameter
7
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ISO 6626-3:2008(E)
d coil-spring groove diameter for type SOR
14
f coil-spring excursion
1
F tangential force
t
h ring width
1
h land width
5
p contact pressure
0
s closed gap
1
w slot length
1
w slot spacing
3
α land angle inside
β land angle outside
θ groove angle for type SOV
4 Piston ring types and designation examples
4.1 Type SOR — Steel oil control rings with R-shaped groove
4.1.1 General features and dimensions
Figure 1 shows the general features and dimensions of piston ring type SOR.
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ISO 6626-3:2008(E)
Dimensions in millimetres

For definitions of symbols, see Clause 3.
For dimensions, see Tables 3, 4, 5, 10, 13, 14, 15 and 16.
Key
1 reference plane
Figure 1 — General features and dimensions of piston ring type SOR
4.1.2 Designation
EXAMPLE A coil-spring-loaded, nitrided oil control ring made of steel with R-shaped groove (SOR), a radial wall
thickness class = small (S), of nominal diameter d = 100 mm (100), a nominal ring width h = 3 mm (3), a land width
1 1
h = 0,20 mm (0,20), a nitrided depth of 0,030 mm min. (NT030), coil spring with reduced heat set (WF), and variable pitch
5
with coil diameter d ground (CSE), medium nominal contact pressure p = 1,5 MPa (PN1,5):
7 0
Piston ring ISO 6626-3-SOR-S 100 x 3 x 0,20 NT030 WF CSE PN1,5
4.2 Type SOV — Steel oil control rings with V-shaped groove
4.2.1 General features and dimensions
Figure 2 shows the general features and dimensions of piston ring type SOV.

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ISO 6626-3:2008(E)
Dimensions in millimetres

For definitions of symbols, see Clause 3.
For dimensions, see Tables 3, 4, 5, 11, 17, 18 and 19.
Key
1 reference plane
Figure 2 — General features and dimensions of piston ring type SOV
4.2.2 Designation
EXAMPLE A coil-spring-loaded, nitrided oil control ring made of steel with V-shaped groove (SOV), a radial wall
thickness class = small (S), V-shaped groove angle 40° (V40), of nominal diameter d = 100 mm (100), a nominal ring
1
width h = 3 mm (3), a land width h = 0,20 mm (0,20), a nitrided depth of 0,030 mm min. (NT030), coil spring with reduced
1 5
heat set (WF), and constant pitch with coil diameter d ground (CSN), medium nominal contact pressure p = 1,5 MPa
7 0
(PN1,5):
Piston ring ISO 6626-3-SOV-S-V40-100 x 3 x 0,20 NT030 WF CSN PN1,5
5 Common features
5.1 Ring width h and radial wall thickness a
1 1
Table 1 shows common features for ring width h and radial wall thickness a .
1 1
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ISO 6626-3:2008(E)
Table 1 — Ring width h and radial wall thickness a
1 1
Dimensions in millimetres
Radial wall thickness
Ring width
a ± 0,15
1
Type
−0,01
h =
10−,03
Small Large
(Code: S) (Code: L)
2,0 1,8 to 2,0 — SOR
2,5 1,8 to 2,0 — SOR
3,0 1,8 to 2,0 2,3 to 2,6 SOR and SOV
4,0 2,0 to 2,6 2,8 to 3,2 SOR and SOV
5.2 Land width h
5
Table 2 shows common features for land width h .
5
Table 2 — Land width h
5
Dimensions in millimetres
Ring width Land width
h h ± 0,07
1 5
2,0 0,20 − −
2,5 0,20 0,25 −
3,0 0,20 0,25 0,30
a
4,0 0,20 0,25 0,30

a
For diameters greater than 120 mm and ring width equal to

4,0 mm, land width equal to 0,20 mm shall not be used.
5.3 Land angle α, β
Table 3 shows common features for land angle α, β.
Table 3 — Land angle α, β
Range of
Land angle Tolerance
nominal angle
a
inside α 5° to 20° ± 5°
a
outside β 10° to 30° ± 5°
a
Nominal angle subject to agreement between

manufacturer and client.
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ISO 6626-3:2008(E)
5.4 Land spacing B
3
Table 4 shows common features for land spacing B .
3
Table 4 — Land spacing B
3
Dimensions in millimetres
Ring width Land spacing

a
h B
1 3
2,0 1,25 to 1,45
2,5 1,35 to 1,75
3,0 1,45 to 2,10
4,0 1,80 to 3,20
a
Bc>+()0, 95
31
5.5 Slot sizes
Table 5 shows common features for slot sizes.
Table 5 — Standard slot sizes
Dimensions in millimetres
Ring width Slot width Slot length Slot spacing
h c w w
1 1 1 3
2,0 0,3 to 0,5 1,4 to 2,5 5 to 10
2,5 0,4 to 0,6 2,0 to 3,0 5 to 10
3,0 0,5 to 0,7 2,5 to 3,5 5 to 10
4,0 0,6 to 1,0 3,0 to 5,0 5 to 10
Slots may open into the gap faces (see Figure 3).

Figure 3 — Arrangement of slots
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ISO 6626-3:2008(E)
5.6 Nitrided surface
Table 6 shows common features for nitrided surfaces.
Table 6 — Nitrided case depth of peripheral surface and sideface
Dimensions in millimetres

a
Nitrided case depth
Code
Peripheral surface Sideface
min. min.
NT010 0,010 0,005
NT030 0,030 0,010
NT050 0,050 0,015

a
For tolerances, see ISO 6621-4.
5.7 Nominal contact pressure and tangential force
Table 7 shows common features for nominal contact pressure.
Table 7 — Nominal contact pressure classes
Dimensions in millimetres
Nominal contact pressure
p
0
Ring width
MPa
h
1
Code Code Code Code
PN1,0 PN1,5 PN2,0 PN2,5
2,0 1,0 1,5 2,0 —
2,5 1,0 1,5 2,0 —
3,0 — 1,5 2,0 2,5
4,0 — 1,5 2,0 2,5
5.8 Tolerance of tangential force F
t
Table 8 shows common features for tangential force F , where
t
F=×dh×p (1)
t1 5 0
Table 8 — Tolerance of tangential force F
t
Tangential force
Tolerance
N
F < 20 ± 4 N
t
F W 20 ± 20 %
t
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ISO 6626-3:2008(E)
6 Coil springs
6.1 Types of coil spring
6.1.1 All values in the dimensional tables are based on cylindrical coil springs made of round wire.
The three designs shown in Figures 4 to 7 are common.
6.1.2 Figure 4 illustrates the design of type CSN coil spring with constant pitch.

Key
1 diameter of wire
Figure 4 — Type CSN coil spring
6.1.3 Figure 5 illustrates the design of type CSG coil spring with constant pitch (coil diameter d ground).
7

Key
1 diameter of wire
a
Approximately 0,8 × diameter of wire.
Figure 5 — Type CSG coil spring
6.1.4 Figure 6 illustrates the design of type CSE coil spring with variable pitch (coil diameter d ground), and
7
Figure 7 shows the position of the area with small pitch.
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ISO 6626-3:2008(E)

Key
1 diameter of wire
a
Approximately 0,8 × diameter of wire.
Figure 6 — Type CSE coil spring
Dimensions in millimetres

Key
1 spring gap
2 area with small pitch
a
Latch pin free length.
b
Latch pin fixed length.
Figure 7 — Position of area with small pitch
NOTE The use of different spring designs can be agreed between manufacturer and client. Changed spring groove
configurations and dimensions can then be necessary.
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ISO 6626-3:2008(E)
6.2 Coil-spring excursion (extended gap)
Coil-spring excursion, f , is the distance between the ends of the ring gap, with unstressed ring, measured in
1
the middle of the spring groove (see Figure 8 and Table 9).

Figure 8 — Coil-spring excursion
Table 9 — Coil-spring excursion
Dimensions in millimetres
Coil-spring excursion
Nominal diameter
f

1
d
1
max.
60 u d < 100 0,1 × d
1 1
100 u d u 200 0,12 × d
1 1
6.3 Position of coil spring gap and fixing
The spring gap shall be approximately 180° from the ring gap and the spring gap ends fixed with a connecting
or latch pin.
6.4 Material
Coil springs are made of materials as shown in ISO 6621-3:2000, Table 1, subclasses MC62 (valve spring
wire), MC67 (stainless steel) and MC68 (piano wire).
Springs are available with two different heat set resistance levels (loss of tangential force under load and
temperature):
⎯ standard heat resistance;
⎯ reduced heat set, code WF.
The test conditions and the permissible loss of tangential forces are given in ISO 6621-5:2005, Table 10.
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ISO 6626-3:2008(E)
7 Type SOR
Table 10 gives the tolerance and calculation criteria on a , a , a , d , d and a for type SOR.
4 13 14 14 7 12
Table 10 — Tolerance and calculation criteria on a , a , a , d , d and a for type SOR

4 13 14 14 7 12
Dimensions in millimetres
Item Symbol Tolerance Calculation criteria
a
aa= 0,35 to 0,6×− 0,2
Groove depth ± 0,1 ( )
4
41
a aa=+ 0,45 to 0,65
Groove depth and bridge ()
± 0,1
13 13 4

a
a aa= 0,1 to 0,3 ×
External land depth max. ()
14 14 1

b
d dh= 0,65 to 0,85 ×
Coil-spring groove diameter ()
± 0,05
14 14 1
d
dd=× 0,05 to 0,3
Coil-spring diameter ± 0,05 ()
7
714
a aa=+d
Radial thickness over coil spring ± 0,15
12 12 13 7
a
This value is to be determined between manufacturer and client.
b
When h is 2,0 or 2,5, dh= 0,75 to 0,85× .
( )
1 14 1
8 Type SOV
8.1 The angle of inside groove, θ, is as follows:
40° ± 1° (code V40) or 45° ± 1° (code V45) ± 1° (angle to reference plane).
See Figure 2.
8.2 Table 11 gives the tolerance and calculation criteria on a , a , a , d , d and a for type SOV.
4 13 14 14 7 12
Table 11 — Tolerance and calculation criteria on a , a , a , d , d and a for type SOV
4 13 14 14 7 12
Dimensions in millimetres
Item Symbol Tolerance Calculation criteria
a
aa= (0,35 to 0,6)×− 0,3
Groove depth ± 0,1
4
41
a aa=+ 0,45 to 0,65
Groove depth and bridge ± 0,1 ( )
13 13 4

a
a aa= (0,1 to 0,3)×
External land depth max.
14 14 1
d dh= 0,6 to 0,8 ×
Coil-spring diameter ± 0,05 ( )
7 71
1 d
⎛⎞
7
a
aa=+()−0,1 to 0,4+ 1+ ×
Radial thickness over coil spring ± 0,15
12 ⎜⎟
12 4
sinθ 2
⎝⎠
a
This value is to be determined between manufacturer and client.
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ISO 6626-3:2008(E)
9 Dimensions
The two cross-sections specified in this part of ISO 6626 (SOR and SOV) are applicable for different diameter
ranges. Table 12 provides a summary of the specifications given in Tables 13 to 19. The detailed Tables 13 to
19 contain the recommended nominal tangential forces of all types and diameters shown in Table 12.
Table 12 — Index of Tables 13 to 19
Dimensions in millimetres
Ring width Radial wall thickness Nominal diameter
Table Type
h a d
1 1 1
13 2,0 and 2,5 SOR-S 60 to 100
14 3,0 SOR-S and SOR-L 65 to 120
SOR
15 4,0 SOR-S and SOR-L 80 to 124
16 4,0 SOR-S and SOR-L 125 to 200
17 3,0 SOV-S and SOV-L 70 to 120
SOV
18 4,0 SOV-S and SOV-L 80 to 124
19 4,0 SOV-S and SOV-L 125 to 200
NOTE Codes S and L are described in Table 1.

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ISO 6626-3:2008(E)
Table 13 — Recommended nominal tangential force of ring type SOR-S (h = 2,0 mm and h = 2,5 mm)
1 1
Dimensions in millimetres
Recommended nominal tangential force
N
Ring type SOR-S
Nominal diameter Closed gap
−0,01 −0,01
d s
h = 2, 0 h = 2, 5
1 1
10−,03 10−,03
h=±0, 2 0, 07 h=±0, 2 0, 07 h=±0, 25 0,07
5 5 5
PN1,0 PN1,5 PN2,0 PN1,0 PN1,5 PN2,0 PN1,0 PN1,5 PN2,0
(1,0 MPa) (1,5 MPa) (2,0 MPa) (1,0 MPa) (1,5 MPa) (2,0 MPa) (1,0 MPa) (1,5 MPa) (2,0 MPa)
60 12 18 24 12 18 24 15 22,5 30
61 12,2 18,3 24,4 12,2 18,3 24,4 15,3 22,9 30,5
62 12,4 18,6 24,8 12,4 18,6 24,8 15,5 23,3 31
63 12,6 18,9 25,2 12,6 18,9 25,2 15,8 23,7 31,5
64 12,8 19,2 25,6 12,8 19,2 25,6 16 24 32
65 13 19,5 26 13 19,5 26 16,3 24,4 32,5
66 13,2 19,8 13,2 19,8 26,4 16,5 24,8 33
+0,2
67 0, 2 13,4 20,1 13,4 20,1 26,8 16,8 25,1 33,5
  0
68 13,6 20,4 13,6 20,4 27,2 17 25,5 34
69 13,8 20,7 13,8 20,7 27,6 17,3 25,9 34,5
—
70 14 21 14 21 28 17,5 26,3 35
71 14,2 21,3 14,2 21,3 28,4 17,8 26,6 35,5
72 14,4 21,6 14,4 21,6 28,8 18 27 36
73 14,6 21,9 14,6 21,9 29,2 18,3 27,4 36,5
74 14,8 22,2 14,8 22,2 29,6 18,5 27,8 37
75 15 22,5 15 22,5 30 18,8 28,1 37,5
76 15,2 22,8 15,2 22,8 30,4 19 28,5 38
77 15,4 23,1 15,4 23,1 30,8 19,3 28,9 38,5
78 15,6 23,4 15,6 23,4 31,2 19,5 29,3 39
79 15,8 23,7 15,8 23,7 31,6 19,8 29,6 39,5
80 16 24 16 24 32 20 30 40
+0,2
81 16,2 24,3 16,2 24,3 32,4 20,3 30,4 40,5
0, 25
—
  0
82 16,4 24,6 16,4 24,6 32,8 20,5 30,8 41
83 16,6 24,9 16,6 24,9 33,2 20,8 31,1 41,5
84 16,8 25,2 16,8 25,2 33,6 21 31,5 42
85 17 25,5 17 25,5 34 21,3 31,9 42,5
86 17,2 25,8 17,2 25,8 34,4 21,5 32,3
—
87 17,4 26,1 17,4 26,1 34,8 21,8 32,6
88 17,6 26,4 17,6 26,4 35,2 22 33
89 17,8 26,7 17,8 26,7 35,6 22,3 33,4
90 18 27 18 27 36 22,5 33,8
91 18,2 18,2 27,3 36,4 22,8 34,1
92 18,4 18,4 27,6 36,8 23 34,5
93 18,6 18,6 27,9 37,2 23,3 34,9
94 18,8 18,8 28,2 37,6 23,5 35,3
95 19 19 28,5 38 23,8 35,6
96 19,2 28,8 38,4 24 36
97 19,4 29,1 38,8 24,3 36,4
98 19,6 29,4 39,2 24,5 36,8
+0,25
0, 3
99 — 19,8 29,7 39,6 24,8 37,1 —
  0
—
100 20 30 40 25 37,5
101
102 —
103
104
— — — — —
105
106
107
108
109
110
111
112
113
114
115
+0,25
116
0, 35
— — — — — — — — —
  0
117
118
119
120
121
122
123
124
NOTE Diameters without value for tangential force are not recommended for use.
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ISO 6626-3:2008(E)
Table 14 — Recommended nominal tangential force of ring type SOR-S and SOR-L (h = 3,0 mm)
1
Dimensions in millimetres
Recommended nominal tangential force
N
Ring type SOR-S Ring type SOR-L
Nominal Closed
−0,01 −0,01
diameter gap
h = 3, 0 h = 3, 0
10−,03 10−,03
d s
1 1
h=±0, 2 0, 07 h=±0, 25 0,07 h=±0, 2 0, 07 h=±0, 25 0,07
5 5 5 5
PN1,5 PN2,0 PN2,5 PN1,5 PN2,0 PN2,5 PN1,5 PN2,0 PN2,5 PN1,5 PN2,0 PN2,5
(1,5 MPa) (2,0 MPa) (2,5 MPa) (1,5 MPa) (2,0 MPa) (2,5 MPa) (1,5 MPa) (2,0 MPa) (2,5 MPa) (1,5 MPa) (2,0 MPa) (2,5 MPa)
60
61
— — — — — —
62
63
64
65 19,5 26 32,5 24,4 32,5 40,6
+0,2
66 19,8 26,4 33 24,8 33 41,3
0, 2
— — — — — —
  0
67 20,1 26,8 33,5 25,1 33,5 41,9
68 20,4 27,2 34 25,5 34 42,5
69 20,7 27,6 34,5 25,9 34,5 43,1
70 21 28 35 26,3 35 43,8
71 21,3 28,4 35,5 26,6 35,5 44,4
72 21,6 28,8 36 27 36 45
73 21,9 29,2 36,5 27,4 36,5 45,6
74 22,2 29,6 37 27,8 37 46,3
75 22,5 30 37,5 28,1 37,5 46,9
76 22,8 30,4 38 28,5 38 47,5
— — — — — —
77 23,1 30,8 38,5 28,9 38,5 48,1
78 23,4 31,2 39 29,3 39 48,8
79 23,7 31,6 39,5 29,6 39,5 49,4
80 24 32 40 30 40 50 24 32 40 30 40 50
+0,2
81 24,3 32,4 40,5 30,4 40,5 50,6 24,3 32,4 40,5 30,4 40,5 50,6
0, 25
  0
82 24,6 32,8 41 30,8 41 51,3 24,6 32,8 41 30,8 41 51,3
83 24,9 33,2 41,5 31,1 41,5 51,9 24,9 33,2 41,5 31,1 41,5 51,9
84 25,2 33,6 42 31,5 42 52,5 25,2 33,6 42 31,5 42 52,5
85 25,5 34 42,5 31,9 42,5 53,1 25,5 34 42,5 31,9 42,5 53,1
86 25,8 34,4 43 32,3 43 53,8 25,8 34,4 43 32,3 43 53,8
87 26,1 34,8 43,5 32,6 43,5 54,4 26,1 34,8 43,5 32,6 43,5 54,4
88 26,4 35,2 44 33 44 55 26,4 35,2 44 33 44 55
89 26,7 35,6 44,5 33,4 44,5 55,6 26,7 35,6 44,5 33,4 44,5 55,6
90 27 36 45 33,8 45 56,3 27 36 45 33,8 45 56,3
91 27,3 36,4 45,5 34,1 45,5 56,9 27,3 36,4 45,5 34,1 45,5 56,9
92 27,6 36,8 46 34,5 46 57,5 27,6 36,8 46 34,5 46 57,5
93 27,9 37,2 46,5 34,9 46,5 58,1 27,9 37,2 46,5 34,9 46,5 58,1
94 28,2 37,6 47 35,3 47 58,8 28,2 37,6 47 35,3 47 58,8
95 28,5 38 47,5 35,6 47,5 59,4 28,5 38 47,5 35,6 47,5 59,4
96 28,8 38,4 48 36 48 60 28,8 38,4 48 36 48 60
97 29,1 38,8 48,5 36,4 48,5 60,6 29,1 38,8 48,5 36,4 48,5 60,6
98 29,4 39,2 49 36,8 49 61,3 29,4 39,2 49 36,8 49 61,3
+0,25
0, 3
99 29,7 39,6 49,5 37,1 49,5 61,9 29,7 39,6 49,5 37,1 49,5 61,9
  0
100 30 40 50 37,5 50 62,5 30 40 50 37,5 50 62,5
101 30,3 40,4 50,5 37,9 50,5 30,3 40,4 50,5 37,9 50,5
102 30,6 40,8 51 38,3 51 30,6 40,8 51 38,3 51
103 30,9 41,2 51,5 38,6 51,5 30,9 41,2 51,5 38,6 51,5
104 31,2 41,6 52 39 52 31,2 41,6 52 39 52
— —
105 31,5 42 52,5 39,4 52,5 31,5 42 52,5 39,4 52,5
106 31,8 42,4 53 39,8 53 31,8 42,4 53 39,8 53
107 32,1 42,8 53,5 40,1 53,5 32,1 42,8 53,5 40,1 53,5
108 32,4 43,2 54 40,5 54 32,4 43,2 54 40,5 54
109 32,7 43,6 54,5 40,9 54,5 32,7 43,6 54,5 40,9 54,5
110 33 44 55 41,3 55 33 44 55 41,3 55
111 33,3 44,4 55,5 41,6 55,5
112 33,6 44,8 56 42 56
113 33,9 45,2 56,5 42,4 56,5
114 34,2 45,6 57 42,8 57
115 34,5 46 57,5 43,1 57,5
+0,25
116 34,8 46,4 58 43,5 58
0, 35 — —
  0
117 — — — — — 35,1 46,8 58,5 43,9 58,5
118 35,4 47,2 59 44,3 59
119 35,7 47,6 59,5 44,6 59,5
120 36 48 60 45 60
121
122 — — — — —
123
124

14 © ISO 2008 – All rights reserved

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ISO 6626-3:2008(E)
Table 15 — Recommended nominal tangential force of ring type SOR-S and SOR-L
(h = 4,0 mm; nominal diameters d < 125 mm)
1 1
Dimensions in millimetres
Recommended nominal tangential force
N
Closed
Nominal Ring type SOR-S Ring type SOR-L
gap
diameter
−0,01 −0,01
d s h = 4, 0 h = 4, 0
10−,03 10−,03
1 1
h=±0, 2 0, 07 h=±0, 25 0,07 h=±0, 3 0, 07 h=±0, 25 0,07 h=±0, 3 0, 07
5 5 5 5 5
PN1,5 PN2,0 PN2,5 PN1,5 PN2,0 PN2,5 PN1,5 PN2,0 PN2,5 PN1,5 PN2,0 PN2,5 PN1,5 PN2,0 PN2,5
1,5 MPa 2,0 MPa 2,5 MPa 1,5 MPa 2,0 MPa 2,5 MPa 1,5 MPa 2,0 MPa 2,5 MPa 1,5 MPa 2,0 MPa 2,5 MPa 1,5 MPa 2,0 MPa 2,5 MPa
60
61
62
63
64
65
66
+0,2
— — — — — — — — — — — — — — —
67 0, 2
  0
68
69
70
71
72
73
74
75
76
77 — — — — — — — — —
78
79
80 24 32 40 30 40 50 36 48 60
81 24,3 32,4 40,5 30,4 40,5 50,6 36,5 48,6 60,8
— — — — — —
+0,2
82 24,6 32,8 41 30,8 41 51,3 36,9 49,2 61,5
0, 25
  0
83 24,9 33,2 41,5 31,1 41,5 51,9 37,4 49,8 62,3
84 25,2 33,6 42 31,5 42 52,5 37,8 50,4 63
85 25,5 34 42,5 31,9 42,5 53,1 38,3 51 63,8
86 25,8 34,4 43 32,3 43 53,8 38,7 51,6 64,5
87 26,1 34,8 43,5 32,6 43,5 54,4 39,2 52,2 65,3
88 26,4 35,2 44 33 44 55 39,6 52,8 66
89 26,7 35,6 44,5 33,4 44,5 55,6 40,1 53,4 66,8
90 27 36 45 33,8 45 56,3 40,5 54 67,5
91 27,3 36,4 45,5 34,1 45,5 56,9 41 54,6 68,3
92 27,6 36,8 46 34,5 46 57,5 41,4 55,2 69
93 27,9 37,2 46,5 34,9 46,5 58,1 41,9 55,8 69,8
— — — — — —
94 28,2 37,6 47 35,3 47 58,8 42,3 56,4 70,5
95 28,5 38 47,5 35,6 47,5 59,4 42,8 57 71,3
96 28,8 38,4 48 36 48 60 43,2 57,6 72
97 29,1 38,8 48,5 36,4 48,5 60,6 43,7 58,2 72,8
98 29,4 39,2 49 36,8 49 61,3 44,1 58,8 73,5
99 29,7 39,6 49,5 37,1 49,5 61,9 44,6 59,4 74,3
+0,25
0, 3
  0
100 30 40 50 37,5 50 62,5 45 60 75 37,5 40 50 45 60 75
101 30,3 40,4 50,5 37,9 50,5 63,1 45,5 60,6 75,8 37,9 40,5 50,6 45,5 60,6 75,8
102 30,6 40,8 51 38,3 51 63,8 45,9 61,2 76,5 38,3 41 51,3 45,9 61,2 76,5
103 30,9 41,2 51,5 38,6 51,5 64,4 46,4 61,8 77,3 38,6 41,5 51,9 46,4 61,8 77,3
104 31,2 41,6 52 39 52 65 46,8 62,4 78 39,0 42 52,5 46,8 62,4 78
105 31,5 42 52,5 39,4 52,5 65,6 47,3 63 78,8 39,4 42,5 53,1 47,3 63 78,8
106 31,8 42,4 53 39,8 53 66,3 47,7 63,6 79,5 39,8 43 53,8 47,7 63,6 79,5
107 32,1 42,8 53,5 40,1 53,5 66,9 48,2 64,2 80,3 40,1 43,5 54,4 48,2 64,2 80,3
108 32,4 43,2 54 40,5 54 67,5 48,6 64,8 81 40,5 44 55 48,6 64,8 81
109 32,7 43,6 54,5 40,9 54,5 68,1 49,1 65,4 81,8 40,9 44,5 55,6 49,1 65,4 81,8
110 33 44 55 41,3 55 68,8 49,5 66 82,5 41,3 45 56,3 49,5 66 82,5
111 33,3 44,4 55,5 41,6 55,5 69,4 50 66,6 83,3 41,6 45,5 56,9 50 66,6 83,3
112 33,6 44,8 56 42 56 70 50,4 67,2 84 42,0 46 57,5 50,4 67,2 84
113 33,9 45,2 56,5 42,4 56,5 70,6 50,9 67,8 84,8 42,4 46,5 58,1 50,9 67,8 84,8
114 34,2 45,6 57 42,8 57 71,3 51,3 68,4 85,5 42,8 47 58,8 51,3 68,4 85,5
115 34,5 46 57,5 43,1 57,5 71,9 51,8 69 86,3 43,1 47,5 59,4 51,8 69 86,3
116 34,8 46,4 58 43,5 58 72,5 52,2 69,6 87 43,5 48 60 52,2 69,6 87
+0,25
117 35,1 46,8 58,5 43,9 58,5 73,1 52,7 70,2 87,8 43,9 48,5 60,6 52,7 70,2 87,8
0, 35
  0
118 35,4 47,2 59 44,3 59 73,8 53,1 70,8 88,5 44,3 49 61,3 53,1 70,8 88,5
119 35,7 47,6 59,5
...