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Thickness<br />
�<br />
1.00<br />
1.20<br />
1.50<br />
1.60<br />
1.78<br />
2.00<br />
2.20<br />
2.40<br />
2.50<br />
2.62<br />
3.00<br />
3.35<br />
3.50<br />
3.53<br />
4.00<br />
4.50<br />
5.00<br />
5.34<br />
6.00<br />
7.00<br />
8.00<br />
10.00<br />
www.pfeiffer-vacuum.net<br />
If these conditions are maintained, the seals can be reused multiple times without any problem.<br />
If the groove is overfilled, the o-rings will be damaged and the flange might even bend,<br />
because the ring material is non-compressible. The table below shows groove dimensions,<br />
with the inside diameter of the groove and the inside diameter of the o-rings being equal.<br />
Table 6.1: O-ring groove dimensioning table for axial, static seals<br />
Tolerance<br />
+ / -<br />
0.08<br />
0.08<br />
0.08<br />
0.08<br />
0.08<br />
0.10<br />
0.10<br />
0.10<br />
0.10<br />
0.10<br />
0.13<br />
0.13<br />
0.13<br />
0.13<br />
0.15<br />
0.15<br />
0.15<br />
0.15<br />
0.15<br />
0.14<br />
0.14<br />
0.14<br />
Groove<br />
Width<br />
1.45<br />
1.65<br />
2.00<br />
2.10<br />
2.30<br />
2.50<br />
2.80<br />
3.00<br />
3.10<br />
3.20<br />
3.70<br />
4.10<br />
4.30<br />
4.30<br />
5.00<br />
5.50<br />
6.00<br />
6.50<br />
7.20<br />
8.50<br />
9.50<br />
12.00<br />
Tolerance<br />
+ / -<br />
0.05<br />
0.05<br />
0.05<br />
0.05<br />
0.05<br />
0.10<br />
0.10<br />
0.10<br />
0.10<br />
0.10<br />
0.10<br />
0.10<br />
0.10<br />
0.10<br />
0.10<br />
0.10<br />
0.10<br />
0.10<br />
0.10<br />
0.10<br />
0.10<br />
0.10<br />
Groove<br />
Depth<br />
0.70<br />
0.85<br />
1.10<br />
1.20<br />
1.30<br />
1.50<br />
1.65<br />
1.80<br />
1.90<br />
2.00<br />
2.30<br />
2.60<br />
2.70<br />
2.80<br />
3.20<br />
3.60<br />
4.00<br />
4.30<br />
4.90<br />
5.80<br />
6.70<br />
8.50<br />
Tolerance<br />
+ / -<br />
0.05<br />
0.05<br />
0.05<br />
0.05<br />
0.05<br />
0.05<br />
0.05<br />
0.05<br />
0.05<br />
0.05<br />
0.05<br />
0.05<br />
0.05<br />
0.05<br />
0.05<br />
0.05<br />
0.05<br />
0.05<br />
0.10<br />
0.10<br />
0.10<br />
0.15<br />
Mean Max.<br />
Compression Fill Factor<br />
30.0 % 86.3 %<br />
29.2 % 88.4 %<br />
26.7 % 86.3 %<br />
25.0 % 85.3 %<br />
27.0 % 88.5 %<br />
25.0 % 90.3 %<br />
25.0 % 88.0 %<br />
25.0 % 89.1 %<br />
24.0 % 88.4 %<br />
23.7 % 89.2 %<br />
23.3 % 87.3 %<br />
22.4 % 86.4 %<br />
22.9 % 86.4 %<br />
20.7 % 84.7 %<br />
20.0 % 81.4 %<br />
20.0 % 83.0 %<br />
20.0 % 84.3 %<br />
19.5 % 82.3 %<br />
18.3 % 83.0 %<br />
17.1 % 80.4 %<br />
16.3 % 81.0 %<br />
15.0 % 79.0 %<br />
To facilitate assembly, the diameter of the o-ring groove is usually selected somewhat larger<br />
than the diameter of the o-ring. This keeps the o-ring in the groove during assembly. There<br />
is no problem in stretching an o-ring by 5 % in length, however not more than 10 %. If the<br />
o-ring is used on a centering ring, e.g. in ISO-K and ISO-KF flange connections, the centering<br />
ring must be designed in such a manner that it properly positions the o-ring, supports it and<br />
limits its compression. There are centering rings that have inner support rings, outer support<br />
rings (for overpressure applications), as well as inner and outer rings.<br />
To seal screws, e.g. oil filler screws or oil drain plugs, the o-ring is installed in an angular position.<br />
The thread has a 45° chamfer at the upper end, into which the o-ring is inserted. Here,<br />
too, the fill factor should be 79 – 91%, as in the case of axial installation. The o-ring is then<br />
compressed by surface of the screw. The o-ring should be lubricated for this installation<br />
method to prevent it from being damaged when the screw is tightened.<br />
Page 123<br />
<strong>Vacuum</strong><br />
<strong>Technology</strong>
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