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METRIC
INCH
STANDARD
NOMINAL SIZE
STANDARD
(MM)
I.D.
O.D.
C.S.
I.D.
±
I.D.
±
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
-446
AN 6227B-73 -446
8-1/2
x9
x1/4
8.475 .055 215.27
1.40
-447
AN 6227B-74 -447
9
x9-1/2
x1/4
8.975 .055 227.97
1.40
-448
AN 6227B-75 -448
9-1/2
x10
x1/4
9.475 .055 240.67
1.40
-449
AN 6227B-76 -449
10
x10-1/2
x1/4
9.975 .055 253.37
1.40
-450
AN 6227B-77 -450
10-1/2 x11
x1/4
10.475 .060 266.07
1.52
-451
AN 6227B-78 -451
11
x11-1/2
x1/4
10.975 .060 278.77
1.52
-452
AN 6227B-79 -452
11-1/2 x12
x1/4
11.475 .060 291.47
1.52
-453
AN 6227B-80 -453
12
x12-1/2
x1/4
11.975 .060 304.17
1.52
-454
AN 6227B-81 -454
12-1/2 x13
x1/4
12.475 .060 316.87
1.52
-455
AN 6227B-82 -455
13
x13-1/2
x1/4
12.975 .060 329.57
1.52
-456
AN 6227B-83 -456
13-1/2 x14
x1/4
13.475 .070 342.27
1.78
-457
AN 6227B-84 -457
14
x14-1/2
x1/4
13.975 .070 354.97
1.78
-458
AN 6227B-85 -458
14-1/2 x15
x1/4
14.475 .070 367.67
1.78
-459
AN 6227B-86 -459
15
x15-1/2
x1/4
14.975 .070 380.37
1.78
-460
AN 6227B-87 -460
15-1/2 x16
x1/4
15.475 .070 393.07
1.78
-461
-461*††
16
x16-1/2
x1/4
15.955 .075 405.26
1.90
-462
-462*††
16-1/2 x17
x1/4
16.455 .075 417.96
1.90
-463
-463*††
17
x17-1/2
x1/4
16.955 .080 430.66
2.03
-464
-464*††
17-1/2 x18
x1/4
17.455 .085 443.36
2.15
-465
-465*††
18
x18-1/2
x1/4
17.955 .085 456.06
2.15
-466
-466*††
18-1/2 x19
x1/4
18.455 .085 468.76
2.15
-467
-467*††
19
x19-1/2
x1/4
18.955 .090 481.46
2.29
-468
-468*††
19-1/2 x20
x1/4
19.455 .090 494.16
2.29
-469
-469*††
20
x20-1/2
x1/4
19.955 .095 506.86
2.41
-470
-470*††
21
x21-1/2
x1/4
20.955 .095 532.26
2.41
-471
-471*††
22
x22-1/2
x1/4
21.955 .100 557.66
2.55
-472
-472*††
23
x23-1/2
x1/4
22.940 .105 582.68
2.67
-473
-473*††
24
x24-1/2
x1/4
23.940 .110 608.08
2.79
-474
-474*††
25
x25-1/2
x1/4
24.940 .115 633.48
2.92
-475
-475*††
26
x26-1/2
x1/4
25.940 .120 658.88
3.05
-425 to -475 Cross Section Diameters = .275 ± .006 inches — 6.99 ± 0.15 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, NAS 1593 or NAS 1594.
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.