6-3. Shape and dimensions of O-ring mounting groove
(For fixing S series)
(NOK S standard)

unit=mm
NOK
Call
Number
O-ring dimensions Groove dimensions
Thickness W Inner diameter do d-0.005 D1+0.005 D+0.005 G+0.025 H-0.01
S 3
S 4
S 5
S 6
S 7

S 8
S 9
S10
S11.2
S12

S12.5
S14
S15
S16
S18

S20
S22
1.5}0.1 2.5
3.5
4.5
5.5
6.5

7.5
8.5
9.5
10.7
11.5

12.0
13.5
14.5
15.5
17.5

19.5
21.5
}0.15 3
4
5
6
7

8
9
10
11.2
12

12.5
14
15
16
18

20
22
5.3
6.3
7.3
8.3
9.3

10.3
11.3
12.3
13.5
14.3

14.8
16.3
17.3
18.3
20.3

22.3
24.3
5
6
7
8
9

10
11
12
13.2
14

14.5
16
17
18
20

22
24
2.5 1.0
S22.4
S24
S25
S26
S28

S29
S30
S31.5
S32
S34

S35
S35.5
S36
S38
S39

S40
2.0}0.1 21.9
23.5
24.5
25.5
27.5

28.5
29.5
31.0
31.5
33.5

34.5
35.0
35.5
37.5
38.5

39.5
22.4
24
25
26
28

29
30
31.5
32
34

35
35.5
36
38
39

40
25.9
27.5
28.5
29.5
31.5

32.5
33.5
35
35.5
37.5

38.5
39
39.5
41.5
42.5

43.5
25.4
27
28
29
31

32
33
34.5
35
37

38
38.5
39
41
42

43
2.7 1.5
S42
S44
S45
S46
S48
S50

S53
S55
S56
S60
S63

S65
S67
S70
41.5
43.5
44.5
45.5
47.5
49.5

52.5
54.5
55.5
59.5
62.5

64.5
66.5
69.5
}0.25 42
44
45
46
48
50

53
55
56
60
63

65
67
70
45.5
47.5
48.5
49.5
51
53

56
58
59
63
66

68
70
73
45
47
48
49
51
53

56
58
59
63
66

68
70
73
S71
S75
S80
S85
S90

S95
S100
S105
S110
S112

S115
S120
S125
70.5
74.5
79.5
84.5
89.5

94.5
99.5
104.5
109.5
111.5

114.5
119.5
124.5
}0.4 71
75
80
85
90

95
100
105
110
112

115
120
125
74
78
83
88
93

98
103
108
113
115

118
123
128
74
78
83
88
93

98
103
108
113
115

118
123
128
S130
S132
S135
S140
S145

S150
129.5
131.5
134.5
139.5
144.5

149.5
}0.6 130
132
135
140
145

150
133
135
138
143
148

153
133
135
138
143
148

153
References: "NOK O-ring" (NOK CORPORATION ed. Cat. No.050 E 2-98) NOK E O-ring, page 21 NOK S series (for fixing).