9
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METRIC
INCH
STANDARD
NOMINAL SIZE
STANDARD
(MM)
I.D.
O.D.
C.S.
I.D.
±
I.D.
±
-141
-141
2-5/16 x2-1/2
x3/32 2.300
.020 58.42
0.51
-142
-142
2-3/8
x2-9/16
x3/32 2.362
.020 59.99
0.51
-143
-143
2-7/16 x2-5/8
x3/32 2.425
.020 61.60
0.51
-144
-144
2-1/2
x2-11/16 x3/32 2.487
.020 63.17
0.51
-145
-145
2-9/16 x2-3/4
x3/32 2.550
.020 64.77
0.51
-146
-146
2-5/8
x2-13/16
x3/32 2.612
.020 66.34
0.51
-147
-147
2-11/16 x2-7/8
x3/32 2.675
.022 67.95
0.56
-148
-148
2-3/4
x2-15/16
x3/32 2.737
.022 69.52
0.56
-149
-149
2-13/16 x 3
x3/32 2.800
.022 71.12
0.56
-150
-150*
2-7/8
x3-1/16
x3/32 2.862
.022 72.69
0.56
-151
-151*
3
x3-3/16
x3/32 2.987
.024 75.87
0.61
-152
-152*
3-1/4
x3-7/16
x3/32 3.237
.024 82.22
0.61
-153
-153*
3-1/2
x3-11/16
x3/32 3.487
.024 88.57
0.61
-154
-154*
3-3/4
x3-15/16
x3/32 3.737
.028 94.92
0.71
-155
-155*
4
x4-3/16
x3/32 3.987
.028 101.27
0.71
-156
-156*
4-1/4
x4-7/16
x3/32 4.237
.030 107.62
0.76
-157
-157*
4-1/2
x4-11/16
x3/32 4.487
.030 113.97
0.76
-158
-158*
4-3/4
x4-15/16
x3/32 4.737
.030 120.32
0.76
-159
-159*
5
x5-3/16
x3/32 4.987
.035 126.67
0.89
-160
-160*
5-1/4
x5-7/16
x3/32 5.237
.035 133.02
0.89
-161
-161*
5-1/2
x5-11/16 x3/32 5.487
.035 139.37
0.89
-162
-162*
5-3/4
x5-15/16
x3/32 5.737
.035 145.72
0.89
-163
-163*††
6
x6-3/16
x3/32 5.987
.035 152.07
0.89
-164
-164*††
6-1/4
x6-7/16
x3/32 6.237
.040 158.42
1.02
-165
-165*††
6-1/2
x6-11/16
x3/32 6.487
.040 164.77
1.02
-166
-166*††
6-3/4
x6-15/16
x3/32 6.737
.040 171.12
1.02
-167
-167*††
7
x7-3/16
x3/32 6.987
.040 177.47
1.02
-168
-168*††
7-1/4
x7-7/16
x3/32 7.237
.045 183.82
1.14
-169
-169*††
7-1/2
x7-11/16 x3/32 7.487
.045 190.17
1.14
-170
-170*††
7-3/4
x7-15/16
x3/32 7.737
.045 196.52
1.14
-171
-171*††
8
x8-3/16
x3/32 7.987
.045 202.87
1.14
-172
-172*††
8-1/4
x8-7/16
x3/32 8.237
.050 209.22
1.27
-173
-173*††
8-1/2
x8-11/16 x3/32 8.487
.050 215.57
1.27
-174
-174*††
8-3/4
x8-15/16
x3/32 8.737
.050 221.92
1.27
-175
-175*††
9
x9-3/16
x3/32 8.987
.050 228.27
1.27
-176
-176*††
9-1/4
x9-7/16
x3/32 9.237
.055 234.62
1.40
-177
-177*††
9-1/2
x9-11/16
x3/32 9.487
.055 240.97
1.40
-178
-178*††
9-3/4
x9-15/16
x3/32 9.737
.055 247.32
1.40
-201 to -284 Cross Section Diameters = .139 + .004 inches — 3.53 + 0.10 millimeters.
-201
3/16
x 7/16
x1/8
.171
.005
4.34
0.13
-202
1/4
x 1/2
x1/8
.234
.005
5.94
0.13
-203
5/16
x 9/16
x1/8
.296
.005
7.52
0.13
-204
3/8
x 5/8
x1/8
.359
.005
9.12
0.13
-205
7/16
x 11/16
x1/8
.421
.005 10.69
0.13
MS 28775
MS 29513
AN 6227B MS 29561 AN 123856
1
AND
MS 9021
TO
AN 6230B MS 9068 AN 123934
NAS 1593
NAS 1594
AS-568A
NAS 1611
UNIVERSAL
DASH
PART
DASH
PART
NUMBERS NUMBERS NUMBERS NUMBERS
-102 to -178 Cross Section Diameters = .103 + .003 inches — 2.62 + 0.08 millimeters.
1 For AN 123956 to AN 124034, add 100 to part numbers shown in this column.
* These dash numbers are not included in MS 28775, MS 29561 or NAS 1611 series.
** These dash numbers are not included in MS 9068, MS 29561, NAS 1593 or NAS 1594 series.
Standard O-Ring Sizes and Dimensions (Continued)
NOTES: (1) “AN”, “MS”, and “NAS” information is for size cross-reference only. “AN”, “MS”, and “NAS” O-Rings require special compounds. APG O-Rings are available in a variety of
compounds.
(2) Actual dimensions for standard (AN) shrinkage materials only. These correspond to AS568A dimensions. O-Rings manufactured out of compounds with different shrinkage
rates (other than AN) will produce slightly different dimensions and tolerances.