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Static Face Seal with a Dovetail Gland
Sealing Basics
Cross-section squeeze: Cross-section squeeze is defined as the compression of the seal cross-section, which is a result of the gland depth being less than the seal cross-section diameter. It is recommended that static seals have a squeeze percentage of 20-25% at maximum gland fill. This range ensures that the seal will not be over-compressed, which could result in premature failure.
Squeeze % = ((Seal Cross-Section - Gland Cross-Section)/Seal Cross-Section) x 100%
Diameter Stretch: Stretch occurs when the inside diameter (I.D.) of the seal is smaller than the gland I.D., requiring extension of the seals diameter for installation and fit. It is generally recommended that a seal not be stretched more than 50% during installation. In smaller diameter o-rings, where the recommended installation stretch is exceeded, sufficient time should be allowed for the o-ring to return to its normal diameter before closing the gland. An installed I.D. stretch percentage of 1-3% is recommended for all gland configurations over 0.500" diameter. The recommended dimensions for glands with diameters less than 0.500" do provide for stretching the o-ring, in the installed state, greater than this amount. Any time an I.D. of an o-ring, in its installed state, is stretched greater than 3%, seal life will be compromised. On face seals, the stretch ensures the seal will stay in the gland. Overstretching a seal may cause additional stresses in the material and lead to premature failure. Rod seals are normally compressed or have line-to-line fit on the outside diameter without any stretch.
Stretch % = ((Gland I.D. - Seal I.D.)/Seal I.D.) x 100%
Gland Volume Fill: Gland volume fill is defined as the amount of gland volume occupied by the seal in a compressed state. The recommended ranges for gland volume fill percentage are: static applications: 85-90%. These ranges allow for tolerance variations, thermal expansion and fluid volume. They also prevent excessive movement of the seal in the gland.
Gland Fill % = (Seal Volume/Gland Volume) x 100%
Material Selection: The correct balance of physical properties and service media compatibility ensures that the hardware and seal combination will meet the application requirements. In semiconductor manufacturing, the seal and hardware material face an additional requirement: The combination must not add contaminants during the wafer fabrication process.
Gland Surface Finish: To optimize the sealing integrity and performance life, the gland surface should be free of nicks, dents and scratches. A gland surface finish of 8-16 Ra is recommended for vacuum systems. A gland surface finish of 16-32 Ra is recommended for pressure or atmospheric systems.
Standard Dovetail Face Sealing Gland
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Select Gland I.D. |
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Standard Face Sealing Diametrical Dimensions
| A Dash Size |
B
O-ring Cross-Section |
C O-Ring Diameter |
D Int. Vacuum Gland I.D. |
E Int. Pressure Gland O.D. |
F Dovetail Gland CL Diameter |
|||||
| Nom | Tol +/- | Nom | Tol +/- | Nom | Tol +/- | Nom | Tol +/- | Nom | Tol +/- | |
| -005 | 0.070 | 0.003 | 0.101 | 0.005 | 0.106 | 0.002 | 0.241 | 0.002 | 0.178 | 0.002 |
| -006 -007 -008 -009 -010 |
0.070 0.070 0.070 0.070 0.070 |
0.003 0.003 0.003 0.003 0.003 |
0.114 0.145 0.176 0.208 0.239 |
0.005 0.005 0.005 0.005 0.005 |
0.119 0.150 0.181 0.213 0.244 |
0.002 0.002 0.002 0.002 0.002 |
0.254 0.285 0.316 0.348 0.379 |
0.002 0.002 0.002 0.002 0.002 |
0.191 0.222 0.253 0.285 0.316 |
0.002 0.002 0.002 0.002 0.002 |
| -011 -012 -013 -014 -015 |
0.070 0.070 0.070 0.070 0.070 |
0.003 0.003 0.003 0.003 0.003 |
0.301 0.364 0.426 0.489 0.551 |
0.005 0.005 0.005 0.005 0.007 |
0.306 0.369 0.431 0.494 0.558 |
0.002 0.002 0.002 0.002 0.002 |
0.441 0.504 0.566 0.629 0.691 |
0.002 0.002 0.002 0.002 0.002 |
0.378 0.441 0.503 0.568 0.630 |
0.002 0.002 0.002 0.002 0.002 |
| -016 -017 -018 -019 -020 |
0.070 0.070 0.070 0.070 0.070 |
0.003 0.003 0.003 0.003 0.003 |
0.614 0.676 0.739 0.801 0.864 |
0.009 0.009 0.009 0.009 0.009 |
0.623 0.685 0.750 0.813 0.877 |
0.002 0.002 0.002 0.002 0.002 |
0.754 0.816 0.879 0.941 1.004 |
0.002 0.002 0.002 0.002 0.002 |
0.695 0.757 0.822 0.886 0.950 |
0.002 0.002 0.002 0.002 0.002 |
| -021 -022 -023 -024 -025 |
0.070 0.070 0.070 0.070 0.070 |
0.003 0.003 0.003 0.003 0.003 |
0.926 0.989 1.051 1.114 1.176 |
0.009 0.010 0.010 0.010 0.011 |
0.940 1.004 1.067 1.131 1.194 |
0.002 0.002 0.002 0.002 0.002 |
1.066 1.129 1.191 1.254 1.316 |
0.002 0.002 0.002 0.002 0.002 |
1.012 1.076 1.139 1.202 1.265 |
0.002 0.002 0.002 0.002 0.002 |
| -026 -027 -028 -029 -030 |
0.070 0.070 0.070 0.070 0.070 |
0.003 0.003 0.003 0.003 0.003 |
1.239 1.301 1.364 1.489 1.614 |
0.011 0.011 0.013 0.013 0.013 |
1.258 1.321 1.384 1.511 1.638 |
0.002 0.002 0.002 0.002 0.002 |
1.379 1.441 1.504 1.629 1.754 |
0.002 0.002 0.002 0.002 0.002 |
1.328 1.391 1.456 1.582 1.708 |
0.002 0.002 0.002 0.002 0.002 |
| -031 -032 -033 -034 -035 |
0.070 0.070 0.070 0.070 0.070 |
0.003 0.003 0.003 0.003 0.003 |
1.739 1.864 1.989 2.114 2.239 |
0.015 0.015 0.018 0.018 0.018 |
1.765 1.892 2.019 2.146 2.273 |
0.002 0.002 0.002 0.002 0.002 |
1.879 2.004 2.129 2.254 2.379 |
0.002 0.002 0.002 0.002 0.002 |
1.835 1.961 2.089 2.216 2.341 |
0.002 0.002 0.002 0.002 0.002 |
| -036 -037 -038 -039 -040 |
0.070 0.070 0.070 0.070 0.070 |
0.003 0.003 0.003 0.003 0.003 |
2.364 2.489 2.614 2.739 2.864 |
0.018 0.018 0.020 0.020 0.020 |
2.399 2.526 2.653 2.780 2.907 |
0.002 0.002 0.002 0.002 0.002 |
2.504 2.629 2.754 2.879 3.004 |
0.002 0.002 0.002 0.002 0.002 |
2.467 2.593 2.720 2.846 2.973 |
0.002 0.002 0.002 0.002 0.002 |
| -041 -042 -043 -044 -045 |
0.070 0.070 0.070 0.070 0.070 |
0.003 0.003 0.003 0.003 0.003 |
2.989 3.239 3.489 3.739 3.989 |
0.024 0.024 0.024 0.027 0.027 |
3.034 3.288 3.541 3.795 4.049 |
0.002 0.002 0.002 0.002 0.002 |
3.129 3.379 3.629 3.879 4.129 |
0.002 0.002 0.002 0.002 0.002 |
3.100 3.352 3.604 3.859 4.112 |
0.002 0.002 0.002 0.002 0.002 |
| -046 -047 -048 -049 -050 |
0.070 0.070 0.070 0.070 0.070 |
0.003 0.003 0.003 0.003 0.003 |
4.239 4.489 4.739 4.989 5.239 |
0.030 0.030 0.030 0.037 0.037 |
4.303 4.556 4.810 5.064 5.318 |
0.002 0.002 0.002 0.002 0.002 |
4.379 4.629 4.879 5.129 5.379 |
0.002 0.002 0.002 0.002 0.002 |
4.364 4.618 4.873 5.125 5.379 |
0.002 0.002 0.002 0.002 0.002 |
Dimensions in inches
| A Dash Size |
B
O-ring Cross-Section |
C O-Ring Diameter |
D Int. Vacuum Gland I.D. |
E Int. Pressure Gland O.D. |
F Dovetail Gland CL Diameter |
|||||
| Nom | Tol +/- | Nom | Tol +/- | Nom | Tol +/- | Nom | Tol +/- | Nom | Tol +/- | |
| -102 -103 -104 -105 |
0.103 0.103 0.103 0.103 |
0.003 0.003 0.003 0.003 |
0.049 0.081 0.112 0.143 |
0.004 0.005 0.005 0.005 |
0.050 0.082 0.114 0.145 |
0.002 0.002 0.002 0.002 |
0.255 0.287 0.318 0.349 |
0.002 0.002 0.002 0.002 |
0.158 0.191 0.222 0.253 |
0.002 0.002 0.002 0.002 |
| -106 -107 -108 -109 -110 |
0.103 0.103 0.103 0.103 0.103 |
0.003 0.003 0.003 0.003 0.003 |
0.174 0.206 0.237 0.299 0.362 |
0.005 0.005 0.005 0.005 0.005 |
0.117 0.209 0.241 0.303 0.367 |
0.002 0.002 0.002 0.002 0.002 |
0.380 0.412 0.443 0.505 0.568 |
0.002 0.002 0.002 0.002 0.002 |
0.284 0.316 0.347 0.409 0.472 |
0.002 0.002 0.002 0.002 0.002 |
| -111 -112 -113 -114 -115 |
0.103 0.103 0.103 0.103 0.103 |
0.003 0.003 0.003 0.003 0.003 |
0.424 0.487 0.549 0.612 0.674 |
0.005 0.005 0.007 0.009 0.009 |
0.430 0.494 0.557 0.621 0.684 |
0.002 0.002 0.002 0.002 0.002 |
0.630 0.693 0.755 0.818 0.880 |
0.002 0.002 0.002 0.002 0.002 |
0.535 0.600 0.662 0.726 0.789 |
0.002 0.002 0.002 0.002 0.002 |
| -116 -117 -118 -119 -120 |
0.103 0.103 0.103 0.103 0.103 |
0.003 0.003 0.003 0.003 0.003 |
0.737 0.799 0.862 0.924 0.987 |
0.090 0.010 0.010 0.010 0.010 |
0.748 0.811 0.875 0.938 1.002 |
0.002 0.002 0.002 0.002 0.002 |
0.943 1.005 1.068 1.130 1.193 |
0.002 0.002 0.002 0.002 0.002 |
0.854 0.917 0.982 1.044 1.108 |
0.002 0.002 0.002 0.002 0.002 |
| -121 -122 -123 -124 -125 |
0.103 0.103 0.103 0.103 0.103 |
0.003 0.003 0.003 0.003 0.003 |
1.049 1.112 1.174 1.237 1.299 |
0.010 0.010 0.012 0.012 0.012 |
1.065 1.129 1.192 1.256 1.318 |
0.002 0.002 0.002 0.002 0.002 |
1.255 1.318 1.380 1.443 1.505 |
0.002 0.002 0.002 0.002 0.002 |
1.170 1.233 1.297 1.361 1.423 |
0.002 0.002 0.002 0.002 0.002 |
| -126 -127 -128 -129 -130 |
0.103 0.103 0.103 0.103 0.103 |
0.003 0.003 0.003 0.003 0.003 |
1.362 1.424 1.487 1.549 1.612 |
0.012 0.012 0.012 0.015 0.015 |
1.382 1.445 1.509 1.572 1.636 |
0.002 0.002 0.002 0.002 0.002 |
1.568 1.630 1.693 1.755 1.818 |
0.002 0.002 0.002 0.002 0.002 |
1.487 1.548 1.612 1.677 1.741 |
0.002 0.002 0.002 0.002 0.002 |
-131 |
0.103 |
0.003 |
1.674 1.737 1.799 1.862 1.925 |
0.015 0.015 0.015 0.015 0.017 |
1.699 1.763 1.826 1.890 1.954 |
0.002 |
1.880 1.943 2.005 2.068 2.131 |
0.002 |
1.803 1.866 1.929 1.991 2.057 |
0.002 0.002 0.002 0.002 0.002 |
-136 |
0.103 |
0.003 |
1.987 2.050 2.112 2.175 2.237 |
0.017 0.017 0.017 0.017 0.017 |
2.017 2.081 2.144 2.208 2.271 |
0.002 |
2.193 2.256 2.318 2.381 2.443 |
0.002 |
2.120 2.184 2.246 2.309 2.372 |
0.002 0.002 0.002 0.002 0.002 |
-131 |
0.103 |
0.003 |
1.674 1.737 1.799 1.862 1.925 |
0.015 0.015 0.015 0.015 0.017 |
1.699 1.763 1.826 1.890 1.954 |
0.002 |
1.880 1.943 2.005 2.068 2.131 |
0.002 |
1.803 1.866 1.929 1.991 2.057 |
0.002 0.002 0.002 0.002 0.002 |
-136 |
0.103 |
0.003 |
1.987 2.050 2.112 2.175 2.237 |
0.017 0.017 0.017 0.017 0.017 |
2.017 2.081 2.144 2.208 2.271 |
0.002 |
2.193 2.256 2.318 2.381 2.443 |
0.002 |
2.120 2.184 2.246 2.309 2.372 |
0.002 0.002 0.002 0.002 0.002 |
| -141 -142 -143 -144 -145 |
0.103 0.103 0.103 0.103 0.103 |
0.003 0.003 0.003 0.003 0.003 |
2.300 2.362 2.425 2.487 2.550 |
0.020 0.020 0.020 0.020 0.020 |
2.335 2.397 2.461 2.524 2.588 |
0.002 0.002 0.002 0.002 0.002 |
2.506 2.568 2.631 2.693 2.756 |
0.002 0.002 0.002 0.002 0.002 |
2.435 2.500 2.564 2.626 2.688 |
0.002 0.002 0.002 0.002 0.002 |
| -146 -147 -148 -149 -150 |
0.103 0.103 0.103 0.103 0.103 |
0.003 0.003 0.003 0.003 0.003 |
2.612 2.675 2.737 2.800 2.862 |
0.020 0.022 0.022 0.022 0.022 |
2.651 2.715 2.778 2.842 2.905 |
0.002 0.002 0.002 0.002 0.002 |
2.818 2.881 2.943 3.006 3.068 |
0.002 0.002 0.002 0.002 0.002 |
2.752 2.816 2.878 2.942 3.004 |
0.002 0.002 0.002 0.002 0.002 |
| -151 -152 -153 -154 -155 |
0.103 0.103 0.103 0.103 0.103 |
0.003 0.003 0.003 0.003 0.003 |
2.987 3.237 3.487 3.737 3.987 |
0.024 0.024 0.024 0.028 0.028 |
3.032 3.286 3.539 3.793 4.047 |
0.002 0.002 0.002 0.002 0.002 |
3.193 3.443 3.693 3.943 4.193 |
0.002 0.002 0.002 0.002 0.002 |
3.133 3.384 3.638 3.891 4.147 |
0.002 0.002 0.002 0.002 0.002 |
| -156 -157 -158 -159 -160 |
0.103 0.103 0.103 0.103 0.103 |
0.003 0.003 0.003 0.003 0.003 |
4.237 4.487 4.737 4.987 5.237 |
0.030 0.030 0.030 0.035 0.035 |
4.301 4.554 4.808 5.062 5.316 |
0.002 0.002 0.002 0.002 0.002 |
4.443 4.693 4.943 5.193 5.443 |
0.002 0.002 0.002 0.002 0.002 |
4.400 4.657 4.911 5.165 5.419 |
0.002 0.002 0.002 0.002 0.002 |
| -161 -162 -163 -164 -165 |
0.103 0.103 0.103 0.103 0.103 |
0.003 0.003 0.003 0.003 0.003 |
5.487 5.737 5.987 6.237 6.487 |
0.035 0.035 0.035 0.040 0.040 |
5.569 5.823 6.077 6.331 6.584 |
0.002 0.002 0.002 0.002 0.002 |
5.693 5.943 6.193 6.443 6.693 |
0.002 0.002 0.002 0.002 0.002 |
5.672 5.926 6.180 6.434 6.687 |
0.002 0.002 0.002 0.002 0.002 |
| -166 -167 -168 -169 -170 |
0.103 0.103 0.103 0.103 0.103 |
0.003 0.003 0.003 0.003 0.003 |
6.737 6.987 7.237 7.487 7.737 |
0.040 0.040 0.045 0.045 0.045 |
6.838 7.092 7.346 7.599 7.853 |
0.002 0.002 0.002 0.002 0.002 |
6.943 7.193 7.443 7.693 7.943 |
0.002 0.002 0.002 0.002 0.002 |
6.941 7.195 7.449 7.702 7.956 |
0.002 0.002 0.002 0.002 0.002 |
| -171 -172 -173 -174 -175 |
0.103 0.103 0.103 0.103 0.103 |
0.003 0.003 0.003 0.003 0.003 |
7.987 8.237 8.487 8.737 8.987 |
0.045 0.050 0.050 0.050 0.050 |
8.107 8.361 8.614 8.868 9.122 |
0.002 0.002 0.002 0.002 0.002 |
8.193 8.443 8.693 8.943 9.193 |
0.002 0.002 0.002 0.002 0.002 |
8.210 8.464 8.717 8.971 9.225 |
0.002 0.002 0.002 0.002 0.002 |
| -176 -177 -178 |
0.103 0.103 0.103 |
0.003 0.003 0.003 |
9.237 9.487 9.737 |
0.055 0.055 0.055 |
9.376 9.629 9.883 |
0.002 0.002 0.002 |
9.443 9.693 9.943 |
0.002 0.002 0.002 |
9.479 9.732 9.986 |
0.002 0.002 0.002 |
Dimensions in inches
| A Dash Size |
B
O-ring Cross-Section |
C O-Ring Diameter |
D Int. Vacuum Gland I.D. |
E Int. Pressure Gland O.D. |
F Dovetail Gland CL Diameter |
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| Nom | Tol +/- | Nom | Tol +/- | Nom | Tol +/- | Nom | Tol +/- | Nom | Tol +/- | |
| -201 -202 -203 -204 -205 |
0.139 0.139 0.139 0.139 0.139 |
0.004 0.004 0.004 0.004 0.004 |
0.171 0.234 0.296 0.359 0.421 |
0.005 0.005 0.005 0.005 0.005 |
0.174 0.238 0.300 0.364 0.427 |
0.002 0.002 0.002 0.002 0.002 |
0.449 0.512 0.574 0.637 0.699 |
0.002 0.002 0.002 0.002 0.002 |
0.317 0.380 0.442 0.506 0.569 |
0.002 0.002 0.002 0.002 0.002 |
| -206 -207 -208 -209 -210 |
0.139 0.139 0.139 0.139 0.139 |
0.004 0.004 0.004 0.004 0.004 |
0.484 0.546 0.609 0.671 0.734 |
0.005 0.007 0.009 0.009 0.010 |
0.491 0.554 0.618 0.681 0.745 |
0.002 0.002 0.002 0.002 0.002 |
0.762 0.824 0.887 0.949 1.012 |
0.002 0.002 0.002 0.002 0.002 |
0.633 0.696 0.759 0.823 0.887 |
0.002 0.002 0.002 0.002 0.002 |
| -211 -212 -213 -214 -215 |
0.139 0.139 0.139 0.139 0.139 |
0.004 0.004 0.004 0.004 0.004 |
0.796 0.859 0.921 0.984 1.046 |
0.010 0.010 0.010 0.010 0.010 |
0.808 0.872 0.935 0.999 1.062 |
0.002 0.002 0.002 0.002 0.002 |
1.074 1.137 1.199 1.262 1.324 |
0.002 0.002 0.002 0.002 0.002 |
0.950 1.015 1.077 1.141 1.203 |
0.002 0.002 0.002 0.002 0.002 |
| -216 -217 -218 -219 -220 |
0.139 0.139 0.139 0.139 0.139 |
0.004 0.004 0.004 0.004 0.004 |
1.109 1.171 1.234 1.296 1.359 |
0.012 0.012 0.012 0.012 0.012 |
1.126 1.189 1.253 1.315 1.379 |
0.002 0.002 0.002 0.002 0.002 |
1.387 1.449 1.512 1.574 1.637 |
0.002 0.002 0.002 0.002 0.002 |
1.268 1.330 1.394 1.456 1.519 |
0.002 0.002 0.002 0.002 0.002 |
| -221 -222 -223 -224 -225 |
0.139 0.139 0.139 0.139 0.139 |
0.004 0.004 0.004 0.004 0.004 |
1.421 1.484 1.609 1.734 1.859 |
0.012 0.015 0.015 0.015 0.018 |
1.442 1.506 1.633 1.760 1.887 |
0.002 0.002 0.002 0.002 0.002 |
1.699 1.762 1.887 2.012 2.137 |
0.002 0.002 0.002 0.002 0.002 |
1.582 1.649 1.774 1.899 2.028 |
0.002 0.002 0.002 0.002 0.002 |
| -226 -227 -228 -229 -230 |
0.139 0.139 0.139 0.139 0.139 |
0.004 0.004 0.004 0.004 0.004 |
1.984 2.109 2.234 2.359 2.484 |
0.018 0.018 0.020 0.020 0.020 |
2.014 2.141 2.268 2.394 2.521 |
0.002 0.002 0.002 0.002 0.002 |
2.262 2.387 2.512 2.637 2.762 |
0.002 0.002 0.002 0.002 0.002 |
2.153 2.280 2.407 2.533 2.660 |
0.002 0.002 0.002 0.002 0.002 |
| -231 -232 -233 -234 -235 |
0.139 0.139 0.139 0.139 0.139 |
0.004 0.004 0.004 0.004 0.004 |
2.609 2.734 2.859 2.984 3.109 |
0.020 0.024 0.024 0.024 0.024 |
2.648 2.775 2.902 3.029 3.156 |
0.002 0.002 0.002 0.002 0.002 |
2.887 3.012 3.137 3.262 3.387 |
0.002 0.002 0.002 0.002 0.002 |
2.787 2.914 3.041 3.168 3.295 |
0.002 0.002 0.002 0.002 0.002 |
| -236 -237 -238 -239 -240 |
0.139 0.139 0.139 0.139 0.139 |
0.004 0.004 0.004 0.004 0.004 |
3.234 3.359 3.484 3.609 3.734 |
0.024 0.024 0.024 0.028 0.028 |
3.283 3.409 3.536 3.663 3.790 |
0.002 0.002 0.002 0.002 0.002 |
3.512 3.637 3.762 3.887 4.012 |
0.002 0.002 0.002 0.002 0.002 |
3.422 3.548 3.675 3.802 3.929 |
0.002 0.002 0.002 0.002 0.002 |
| -241 -242 -243 -244 -245 |
0.139 0.139 0.139 0.139 0.139 |
0.004 0.004 0.004 0.004 0.004 |
3.859 3.984 4.109 4.234 4.359 |
0.028 0.028 0.028 0.030 0.030 |
3.917 4.044 4.171 4.298 4.424 |
0.002 0.002 0.002 0.002 0.002 |
4.137 4.262 4.387 4.512 4.637 |
0.002 0.002 0.002 0.002 0.002 |
4.056 4.183 4.310 4.437 4.563 |
0.002 0.002 0.002 0.002 0.002 |
| -246 -247 -248 -249 -250 |
0.139 0.139 0.139 0.139 0.139 |
0.004 0.004 0.004 0.004 0.004 |
4.484 4.609 4.734 4.859 4.984 |
0.030 0.030 0.030 0.035 0.035 |
4.551 4.678 4.805 4.932 5.059 |
0.002 0.002 0.002 0.002 0.002 |
4.762 4.887 5.012 5.137 5.262 |
0.002 0.002 0.002 0.002 0.002 |
4.690 4.817 4.944 5.071 5.198 |
0.002 0.002 0.002 0.002 0.002 |
| -251 -252 -253 -254 -255 |
0.139 0.139 0.139 0.139 0.139 |
0.004 | ||||||||
