Product Description
The [DIN 3771" standard for O-rings is produced by the Duetsches Institut fr Normung (German Institute for Standards). The [DIN 3771" specification describes 258 O-rings. Each size is designated by the ID cross-section. Optionally, this designation may be followed by a letter indicating the quality level ([N" - normal quality; [S" - special quality. Subsequent to the letter indicating the quality level, the rubber polymer and IRHD hardness may be specified.
In contrast to the AS 568 A inch system, the nominal and physical dimensions of metric O-rings match precisely. That is, a 1 mm O-ring will have a cross-section of 1 mm. The space that is being filled must be about 10% to 15% smaller than the cross-section of the O-ring in order for O-ring to seal properly.
DIN 3771 Size Chart (part of information)
No
Reference
C/S (MM)
I.D. (MM)
C/S (Inch)
I.D. (Inch)
1
1.8 X 1.8
1.80
1.80
0.071
0.071
2
2 X 1.8
1.80
2.00
0.071
0.079
3
2.24 X 1.8
1.80
2.24
0.071
0.088
4
2.5 X 1.8
1.80
2.50
0.071
0.098
5
2.8 X 1.8
1.80
2.80
0.071
0.110
6
3.15 X 1.8
1.80
3.15
0.071
0.124
7
3.55 X 1.8
1.80
3.55
0.071
0.140
8
3.75 X 1.8
1.80
3.75
0.071
0.148
9
4 X 1.8
1.80
4.00
0.071
0.157
10
4.5 X 1.8
1.80
4.50
0.071
0.177
11
4.87 X 1.8
1.80
4.87
0.071
0.192
12
5 X 1.8
1.80
5.00
0.071
0.197
13
5.15 X 1.8
1.80
5.15
0.071
0.203
14
5.3 X 1.8
1.80
5.30
0.071
0.209
15
5.6 X 1.8
1.80
5.60
0.071
0.220
16
6 X 1.8
1.80
6.00
0.071
0.236
17
6.3 X 1.8
1.80
6.30
0.071
0.248
18
6.7 X 1.8
1.80
6.70
0.071
0.264
19
6.9 X 1.8
1.80
6.90
0.071
0.272
20
7.1 X 1.8
1.80
7.10
0.071
0.280
21
7.5 X 1.8
1.80
7.50
0.071
0.295
22
8 X 1.8
1.80
8.00
0.071
0.315
23
8.5 X 1.8
1.80
8.50
0.071
0.335
24
8.75 X 1.8
1.80
8.75
0.071
0.344
25
9 X 1.8
1.80
9.00
0.071
0.354
26
9.5 X 1.8
1.80
9.50
0.071
0.374
27
10 X 1.8
1.80
10.00
0.071
0.394
28
10.6 X 1.8
1.80
10.60
0.071
0.417
29
11.2 X 1.8
1.80
11.20
0.071
0.441
30
11.8 X 1.8
1.80
11.80
0.071
0.465
31
12.5 X 1.8
1.80
12.50
0.071
0.492
32
13.2 X 1.8
1.80
13.20
0.071
0.520
33
14 X 1.8
1.80
14.00
0.071
0.551
34
15 X 1.8
1.80
15.00
0.071
0.591
35
16 X 1.8
1.80
16.00
0.071
0.630
36
17 X 1.8
1.80
17.00
0.071
0.669
37
14 X 2.65
2.65
14.00
0.104
0.551
38
15 X 2.65
2.65
15.00
0.104
0.591
39
16 X 2.65
2.65
16.00
0.104
0.630
40
17 X 2.65
2.65
17.00
0.104
0.669
41
18 X 2.65
2.65
18.00
0.104
0.709
42
19 X 2.65
2.65
19.00
0.104
0.748
43
20 X 2.65
2.65
20.00
0.104
0.787
44
21.2 X 2.65
2.65
21.20
0.104
0.835
45
22.4 X 2.65
2.65
22.40
0.104
0.882
46
23.6 X 2.65
2.65
23.60
0.104
0.929
47
25 X 2.65
2.65
25.00
0.104
0.984
48
25.8 X 2.65
2.65
25.80
0.104
1.016
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