Dynamic I.D./O.D. Seal with a Rectangular 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 dynamic seals, a squeeze percentage of 12-18% is recommended to reduce friction and abrasion.

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%, dynamic applications: 80-85%. 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 Dynamic I.D. and O.D. Sealing Gland
Cross-Sectional Dimensions

AS 568A Series O-Ring Cross-
Section
Gland Width (W) Gland Corner Radii
Nom Tol
+/-
Nom Tol +/- (R1) (R2)
-000
-100
-200
-300
-400
0.070
0.103
0.139
0.210
0.275
0.003
0.004
0.004
0.005
0.006
0.095
0.142
0.189
0.283
0.377
0.002
0.003
0.003
0.003
0.003
0.007
0.007
0.017
0.027
0.027
0.005
0.005
0.005
0.005
0.005

Dynamic I.D./O.D. Sealing Details

semihnbk7-16.tif (98234 bytes)

 

Standard Dynamic I.D./O.D. Seal Diametrical Dimensions

A
Dash
Size
B
O-ring
Cross-Section
C
O-Ring
Diameter
D E F G H I
O.D. Sealing Type I.D. Sealing Type
Gland
Dia
Piston
Dia
Bore
Dia
Gland
Dia
Rod
Dia
Bore
Dia
Nom Tol +/- Nom Tol +/- +.000
-.002
+.000
-.001
+.002
-.000
+.002
-.000
+.000
-.002
+.001
-.000
-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
0.139
0.170
0.201
0.233
0.264
0.247
0.278
0.309
0.341
0.372
0.249
0.280
0.311
0.343
0.374
0.234
0.265
0.296
0.328
0.359
0.124
0.155
0.186
0.218
0.249
0.126
0.157
0.188
0.220
0.251
-011
-012
0.070
0.070
0.003
0.003
0.301
0.364
0.005
0.005
0.326
0.389
0.434
0.497
0.436
0.499
0.421
0.484
0.311
0.374
0.313
0.376

Dimensions in inches

A
Dash
Size
B
O-ring
Cross-Section
C
O-Ring
Diameter
D E F G H I
O.D. Sealing Type I.D. Sealing Type
Gland
Dia
Piston
Dia
Bore
Dia
Gland
Dia
Rod
Dia
Bore
Dia
Nom Tol +/- Nom Tol +/- +.000
-.002
+.000
-.001
+.002
-.000
+.002
-.000
+.000
-.002
+.001
-.000
-104
-105
0.103
0.103
0.003
0.003
0.112
0.143
0.005
0.005
0.136
0.167
0.310
0.341
0.312
0.343
0.300
0.331
0.124
0.155
0.126
0.157
-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
0.198
0.230
0.261
0.323
0.386
0.372
0.404
0.435
0.497
0.560
0.374
0.406
0.437
0.499
0.562
0.362
0.394
0.425
0.487
0.550
0.186
0.218
0.249
0.311
0.374
0.188
0.220
0.251
0.313
0.376
-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
0.448
0.511
0.573
0.636
0.698
0.622
0.685
0.747
0.810
0.872
0.624
0.687
0.749
0.812
0.874
0.612
0.675
0.737
0.800
0.862
0.436
0.499
0.561
0.624
0.686
0.438
0.501
0.563
0.626
0.688
-116 0.103 0.003 0.737 0.009 0.761 0.935 0.935 0.925 0.749 0.751

Dimensions in inches

A
Dash
Size
B
O-ring
Cross-Section
C
O-Ring
Diameter
D E F G H I
O.D. Sealing Type I.D. Sealing Type
Gland
Dia
Piston
Dia
Bore
Dia
Gland
Dia
Rod
Dia
Bore
Dia
Nom Tol +/- Nom Tol +/- +.000
-.002
+.000
-.001
+.002
-.000
+.002
-.000
+.000
-.002
+.001
-.000
-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
0.195
0.258
0.320
0.383
0.445
0.434
0.497
0.559
0.622
0.684
0.437
0.500
0.562
0.625
0.687
0.427
0.490
0.552
0.615
0.677
0.185
0.248
0.310
0.373
0.435
0.188
0.251
0.313
0.376
0.438
-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
0.508
0.570
0.633
0.695
0.758
0.747
0.809
0.872
0.934
0.997
0.750
0.812
0.875
0.937
1.000
0.740
0.802
0.865
0.927
0.990
0.498
0.560
0.623
0.685
0.748
0.501
0.563
0.626
0.688
0.751
-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
0.820
0.883
0.945
1.008
1.070
1.059
1.122
1.184
1.247
1.309
1.062
1.125
1.187
1.250
1.312
1.052
1.115
1.177
1.240
1.302
0.810
0.873
0.935
0.998
1.060
0.813
0.876
0.938
1.001
1.063
-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
1.113
1.195
1.258
1.320
1.383
1.372
1.434
1.497
1.559
1.622
1.375
1.437
1.500
1.562
1.625
1.365
1.427
1.490
1.552
1.615
1.123
1.185
1.248
1.310
1.373
1.126
1.188
1.251
1.313
1.376
-221
-222
0.139
0.139
0.004
0.004
1.421
1.484
0.012
0.015
1.445
1.508
1.684
1.747
1.687
1.750
1.677
1.750
1.435
1.498
1.438
1.501

Dimensions in inches

A
Dash
Size
B
O-ring
Cross-Section
C
O-Ring
Diameter
D E F G H I
O.D. Sealing Type I.D. Sealing Type
Gland
Dia
Piston
Dia
Bore
Dia
Gland
Dia
Rod
Dia
Bore
Dia
Nom Tol +/- Nom Tol +/- +.000
-.004
+.000
-.004
+.000
-.004
+.004
-.000
+.004
-.000
+.004
-.000
-309
-310
0.210
0.210
0.005
0.005
0.412
0.475
0.005
0.005
0.442
0.505
0.809
0.872
0.812
0.875
0.805
0.868
0.435
0.498
0.438
0.501
-311
-312
-313
-314
-315
0.210
0.210
0.210
0.210
0.210
0.005
0.005
0.005
0.005
0.005
0.537
0.600
0.662
0.725
0.787
0.007
0.009
0.009
0.010
0.010
0.567
0.630
0.692
0.755
0.817
0.934
0.997
1.059
1.122
1.184
0.937
1.000
1.062
1.125
1.187
0.930
0.993
1.055
1.118
1.180
0.560
0.623
0.685
0.748
0.810
0.563
0.626
0.688
0.751
0.813
-316
-317
-318
-319
-320
0.210
0.210
0.210
0.210
0.210
0.005
0.005
0.005
0.005
0.005
0.850
0.912
0.975
1.037
1.100
0.010
0.010
0.010
0.010
0.012
0.880
0.942
1.005
1.067
1.130
1.247
1.309
1.372
1.434
1.497
1.250
1.312
1.375
1.437
1.500
1.243
1.305
1.368
1.430
1.493
0.873
0.935
0.998
1.060
1.123
0.876
0.938
1.001
1.063
1.126
-321
-322
-323
-324
-325
0.210
0.210
0.210
0.210
0.210
0.005
0.005
0.005
0.005
0.005
1.162
1.225
1.287
1.350
1.475
0.012
0.012
0.012
0.012
0.015
0.192
0.255
1.317
1.380
1.505
1.559
1.622
1.684
1.747
1.872
1..562
1.625
1.687
1.750
1.875
1.555
1.618
1.680
1.743
1.868
1.185
1.248
1.310
1.373
1.498
1.188
1.251
1.313
1.376
1.501
-326
-327
-328
-329
-330
0.210
0.210
0.210
0.210
0.210
0.005
0.005
0.005
0.005
0.005
1.600
1.725
1.850
1.975
2.100
0.015
0.015
0.015
0.018
0.018
1.630
1.755
1.880
2.005
2.130
1.997
2.122
2.247
2.372
2.497
2.000
2.125
2.250
2.375
2.500
1.993
2.118
2.243
2.368
2.493
1.623
1.748
1.873
1.998
2.123
1.626
1.751
1.876
2.001
2.126
-331
-332
-333
-334
-335
0.210
0.210
0.210
0.210
0.210
0.005
0.005
0.005
0.005
0.005
2.225
2.350
2.475
2.600
2.725
0.018
0.018
0.020
0.020
0.020
2.255
2.380
2.505
2.630
2.755
2.622
2.747
2.872
2.997
3.122
2.625
2.750
2.875
3.000
3.125
2.618
2.743
2.868
2.993
3.118
2.248
2.373
2.498
2.623
2.748
2.251
2.376
2.501
2.626
2.751
-336
-337
-338
-339
-340
0.210
0.210
0.210
0.210
0.210
0.005
0.005
0.005
0.005
0.005
2.850
2.975
3.100
3.225
3.350
0.020
0.024
0.024
0.024
0.024
2.880
3.005
3.130
3.255
3.380
3.247
3.372
3.497
3.622
3.747
3.250
3.375
3.500
3.625
3.750
3.243
3.368
3.493
3.618
3.743
2.873
2.998
3.123
3.248
3.373
2.876
3.001
3.126
3.251
3.376
-341
-342
-343
-344
-345
0.210
0.210
0.210
0.210
0.210
0.005
0.005
0.005
0.005
0.005
3.475
3.600
3.725
3.850
3.975
0.024
0.028
0.028
0.028
0.028
3.505
3.630
3.755
3.880
4.005
3.872
3.997
4.122
4.247
4.372
3.875
4.000
4.125
4.250
4.375
3.868
3.993
4.118
4.243
4.368
3.498
3.623
3.748
3.873
3.998
3.501
3.626
3.751
3.876
4.001
-346
-347
-348
-349
0.210
0.210
0.210
0.210
0.005
0.005
0.005
0.005
4.100
4.225
4.350
4.475
0.028
0.030
0.030
0.030
4.130
4.255
4.380
4.505
4.497
4.622
4.747
4.872
4.500
4.625
4.750
4.875
4.493
4.618
4.743
4.868
4.123
4.248
4.373
4.498
4.126
4.251
4.376
4.501

Dimensions in inches

A
Dash
Size
B
O-ring
Cross-Section
C
O-Ring
Diameter
D E F G H I
O.D. Sealing Type I.D. Sealing Type
Gland
Dia
Piston
Dia
Bore
Dia
Gland
Dia
Rod
Dia
Bore
Dia
Nom Tol +/- Nom Tol +/- +.000
-.004
+.000
-.004
+.000
-.004
+.004
-.000
+.004
-.000
+.004
-.000
-425 0.275 0.006 4.475 0.033 4.528 4.998 5.002 4.971 4.497 4.501
-426
-427
-428
-429
-430
0.275
0.275
0.275
0.275
0.275
0.006
0.006
0.006
0.006
0.006
4.600
4.725
4.850
4.975
5.100
0.033
0.033
0.033
0.037
0.037
4.653
4.778
4.903
5.028
5.153
5.123
5.248
5.373
5.498
5.623
5.127
5.252
5.377
5.502
5.627
5.096
5.221
5.346
5.471
5.596
4.622
4.747
4.875
4.997
5.122
4.626
4.751
4.876
5.001
5.126
-431
-432
-433
-434
-435
0.275
0.275
0.275
0.275
0.275
0.006
0.006
0.006
0.006
0.006
5.225
5.350
5.475
5.600
5.725
0.037
0.037
0.037
0.037
0.037
5.278
5.403
5.528
5.653
5.778
5.748
5.873
5.998
6.123
6.248
5.752
5.877
6.002
6.127
6.252
5.721
5.846
5.971
6.096
6.221
5.247
5.372
5.497
5.622
5.747
5.251
5.376
5.501
5.626
5.751
-436
-437
-438
-439
-440
0.275
0.275
0.275
0.275
0.275
0.006
0.006
0.006
0.006
0.006
5.850
5.975
6.225
6.475
6.725
0.037
0.037
0.040
0.040
0.040
5.903
6.028
6.278
6.528
6.778
6.373
6.498
6.748
6.998
7.248
6.377
6.502
6.752
7.002
7.252
6.346
6.471
6.721
6.921
7.221
5.872
5.997
6.247
6.497
6.747
5.873
6.001
6.251
6.501
6.751
-441
-442
-443
-444
-445
0.275
0.275
0.275
0.275
0.275
0.006
0.006
0.006
0.006
0.006
6.975
7.225
7.475
7.725
7.975
0.040
0.045
0.045
0.045
0.045
7.028
7.278
7.528
7.778
8.028
7.498
7.748
7.998
8.248
8.498
7.502
7.752
8.002
8.252
8.502
7.471
7.721
7.971
8.221
8.471
6.997
7.247
7.497
7.747
7.997
7.001
7.251
7.501
7.751
8.001
-446
-447
-448
-449
-450
0.275
0.275
0.275
0.275
0.275
0.006
0.006
0.006
0.006
0.006
8.475
8.975
9.475
9.975
10.475
0.055
0.055
0.055
0.055
0.060
8.528
9.028
9.528
10.028
10.528
8.998
9.498
9.998
10.498
10.998
9.002
9.502
10.002
10.502
11.002
8.971
9.471
9.971
10.471
10.971
8.497
8.997
9.497
9.997
10.497
8.501
9.001
9.501
10.001
10.501
-451
-452
-453
-454
-455
0.275
0.275
0.275
0.275
0.275
0.006
0.006
0.006
0.006
0.006
10.975
11.475
11.975
12.475
12.975
0.060
0.060
0.060
0.060
0.060
11.028
11.528
12.028
12.528
13.028
11.498
11.998
12.498
12.998
13.498
11.502
12.002
12.502
13.002
13.502
11.471
11.971
12.471
12.971
13.471
10.997
11.497
11.997
12.497
12.997
11.001
11.501
12.001
12.501
13.001
-456
-457
-458
-459
-460
0.275
0.275
0.275
0.275
0.275
0.006
0.006
0.006
0.006
0.006
13.475
13.975
14.475
14.975
15.475
0.070
0.070
0.070
0.070
0.070
13.528
14.028
14.528
15.028
15.528
13.998
14.498
14.998
15.498
15.998
14.002
14.502
15.002
15.502
16.002
13.971
14.471
14.971
15.471
15.971
13.497
13.997
14.497
14.997
15.497
13.501
14.001
14.501
15.001
15.501

Dimensions in inches.

Back to the Semiconductor Page

Material Selection Guide (Order Here) | 
O-Rings Explained  | O-Rings Sizing Chart | 
 | Fluid Compalibility Guide | O-Ring Failure Analysis | 
Home | Contact Us | Request a Quote |


Vespel® is a registered trademark of DuPont
Vespel* is a registered trademark of DuPont
Viton and Kalrez are a registered trademark of DuPont Performance Elastomers
Altymid®
and Chemraz® are a registered trademark of Green Tweed


1998-2003  allorings.com Inc.   All rights reserved.