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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 1238561
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
-405*** 2 x2-1/2 x1/4 1.975 .017 50.17 0.43
-406*** 2-1/8 x2-5/8 x1/4 2.100 .018 53.34 0.46
-407*** 2-1/4 x2-3/4 x1/4 2.225 .018 56.52 0.46
-408*** 2-3/8 x2-7/8 x1/4 2.350 .018 59.69 0.46
-409*** 2-1/2 x3 x1/4 2.475 .018 62.87 0.46
-410*** 2-5/8 x3-1/8 x1/4 2.600 .018 66.04 0.46
-411*** 2-3/4 x3-1/4 x1/4 2.725 .022 69.22 0.56
-412*** 2-7/8 x3-3/8 x1/4 2.850 .022 72.39 0.56
-413*** 3 x3-1/2 x1/4 2.975 .024 75.57 0.61
-414*** 3-1/8 x3-5/8 x1/4 3.100 .024 78.74 0.61
-415*** 3-1/4 x3-3/4 x1/4 3.225 .024 81.92 0.61
-416*** 3-3/8 x3-7/8 x1/4 3.350 .026 85.09 0.66
-417*** 3-1/2 x4 x1/4 3.475 .026 88.27 0.66
-418*** 3-5/8 x4-1/8 x1/4 3.600 .026 91.44 0.66
-419*** 3-3/4 x4-1/4 x1/4 3.725 .028 94.62 0.71
-420*** 3-7/8 x4-3/8 x1/4 3.850 .028 97.79 0.71
-421*** 4 x4-1/2 x1/4 3.975 .028 100.97 0.71
-422*** 4-1/8 x4-5/8 x1/4 4.100 .030 104.14 0.76
-423*** 4-1/4 x4-3/4 x1/4 4.225 .030 107.32 0.76
-424*** 4-3/8 x4-7/8 x1/4 4.350 .030 110.49 0.76
-425 to -475 Cross Section Diameters = .275 ± .006 inches — 6.99 ± 0.15 millimeters.
-425 AN 6227B-88 -425 4-1/2 x5 x1/4 4.475 .033 113.67 0.84
-426 AN 6227B-53 -426 4-5/8 x5-1/8 x1/4 4.600 .033 116.84 0.84
-427 AN 6227B-54 -427 4-3/4 x5-1/4 x1/4 4.725 .033 120.02 0.84
-428 AN 6227B-55 -428 4-7/8 x5-3/8 x1/4 4.850 .033 123.19 0.84
-429 AN 6227B-56 -429 5 x5-1/2 x1/4 4.975 .037 126.37 0.94
-430 AN 6227B-57 -430 5-1/8 x5-5/8 x1/4 5.100 .037 129.54 0.94
-431 AN 6227B-58 -431 5-1/4 x5-3/4 x1/4 5.225 .037 132.72 0.94
-432 AN 6227B-59 -432 5-3/8 x5-7/8 x1/4 5.350 .037 135.89 0.94
-433 AN 6227B-60 -433 5-1/2 x6 x1/4 5.475 .037 139.07 0.94
-434 AN 6227B-61 -434 5-5/8 x6-1/8 x1/4 5.600 .037 142.24 0.94
-435 AN 6227B-62 -435 5-3/4 x6-1/4 x1/4 5.725 .037 145.42 0.94
-436 AN 6227B-63 -436 5-7/8 x6-3/8 x1/4 5.850 .037 148.59 0.94
-437 AN 6227B-64 -437 6 x6-1/2 x1/4 5.975 .037 151.77 0.94
-438 AN 6227B-65 -438 6-1/4 x6-3/4 x1/4 6.225 .040 158.12 1.02
-439 AN 6227B-66 -439 6-1/2 x7 x1/4 6.475 .040 164.47 1.02
-440 AN 6227B-67 -440 6-3/4 x7-1/4 x1/4 6.725 .040 170.82 1.02
-441 AN 6227B-68 -441 7 x7-1/2 x1/4 6.975 .040 177.17 1.02
-442 AN 6227B-69 -442 7-1/4 x7-3/4 x1/4 7.225 .045 183.52 1.14
-443 AN 6227B-70 -443 7-1/2 x8 x1/4 7.475 .045 189.87 1.14
-444 AN 6227B-71 -444 7-3/4 x8-1/4 x1/4 7.725 .045 196.22 1.14
-445 AN 6227B-72 -445 8 x8-1/2 x1/4 7.975 .045 202.57 1.14
-400 to -424 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.
*** Dash numbers 400-424 are not listed on AS 568A, but are stock items at American Packing in selected compounds.
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.