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Explore our AS-568 & Extended Standard Size O-Rings including our new 5/32" Nominal Cross Section O-Rings. Precision Associates' O-Rings are available off the shelf in several standard compounds. Or try O-Rings in one of 1,200+ specialty materials in 20 polymer groups, including Viton®, AFLAS®, EPDM, Nitrile, HNBR (HSN), XNBR, Neoprene®, Butyl, XNBR, Silicone, Fluorosilicone, Perfluoroelastomer, Urethane, Hypalon®, and Hydrin®.

Click here to view our 48 (5Mb) Catalog illustrated with full-size drawings of Standard Size O-Rings plus Dimensions and Tolerances.
O-Ring Picture
Unit of Measure
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Item #

C/S (inches)

C/S Tolerance (±)

I.D. (inches)

I.D. Tolerance (±)

O.D. (REF) (inches)

Nominal C/S (inches)

Nominal I.D. (inches)

Nominal O.D. (inches)

Metric C/S (mm)

Metric I.D. (mm)

Metric O.D. (mm)

1-383 N/A 0.210 N/A 0.005 N/A 13.975 N/A 0.070 N/A 14.395 N/A 3/16 N/A 14 N/A 14 3/8 N/A 5.3 N/A 355.0 N/A 365.6
1-384 N/A 0.210 N/A 0.005 N/A 14.975 N/A 0.070 N/A 15.395 N/A 3/16 N/A 15 N/A 15 3/8 N/A 5.3 N/A 380.4 N/A 391.0
1-385 N/A 0.210 N/A 0.005 N/A 15.955 N/A 0.070 N/A 16.375 N/A 3/16 N/A 16 N/A 16 3/8 N/A 5.3 N/A 405.3 N/A 415.9
1-386 N/A 0.210 N/A 0.005 N/A 16.955 N/A 0.080 N/A 17.375 N/A 3/16 N/A 17 N/A 17 3/8 N/A 5.3 N/A 430.7 N/A 441.3
1-387 N/A 0.210 N/A 0.005 N/A 17.955 N/A 0.085 N/A 18.375 N/A 3/16 N/A 18 N/A 18 3/8 N/A 5.3 N/A 456.1 N/A 466.7
1-388 N/A 0.210 N/A 0.005 N/A 18.955 N/A 0.090 N/A 19.375 N/A 3/16 N/A 19 N/A 19 3/8 N/A 5.3 N/A 481.5 N/A 492.1
1-389 N/A 0.210 N/A 0.005 N/A 19.955 N/A 0.095 N/A 20.375 N/A 3/16 N/A 20 N/A 20 3/8 N/A 5.3 N/A 506.9 N/A 517.5
1-390 N/A 0.210 N/A 0.005 N/A 20.955 N/A 0.095 N/A 21.375 N/A 3/16 N/A 21 N/A 21 3/8 N/A 5.3 N/A 532.3 N/A 542.9
1-391 N/A 0.210 N/A 0.005 N/A 21.955 N/A 0.095 N/A 22.415 N/A 3/16 N/A 22 N/A 22 3/8 N/A 5.3 N/A 557.7 N/A 569.3
1-392 N/A 0.210 N/A 0.005 N/A 22.940 N/A 0.105 N/A 23.360 N/A 3/16 N/A 23 N/A 23 3/8 N/A 5.3 N/A 582.7 N/A 593.3
1-393 N/A 0.210 N/A 0.005 N/A 23.940 N/A 0.110 N/A 24.360 N/A 3/16 N/A 24 N/A 24 3/8 N/A 5.3 N/A 608.1 N/A 618.7
1-394 N/A 0.210 N/A 0.005 N/A 24.940 N/A 0.115 N/A 25.360 N/A 3/16 N/A 25 N/A 25 3/8 N/A 5.3 N/A 633.5 N/A 644.1
1-395 N/A 0.210 N/A 0.005 N/A 25.940 N/A 0.120 N/A 26.360 N/A 3/16 N/A 26 N/A 26 3/8 N/A 5.3 N/A 658.9 N/A 669.5
1-396 N/A 0.210 N/A 0.005 N/A 26.940 N/A 0.120 N/A 27.360 N/A 3/16 N/A 27 N/A 27 3/8 N/A 5.3 N/A 684.3 N/A 695.0
1-400 N/A 0.275 N/A 0.006 N/A 1.350 N/A 0.012 N/A 1.900 N/A 1/4 N/A 1 3/8 N/A 1 7/8 N/A 7.0 N/A 34.3 N/A 48.3
1-401 N/A 0.275 N/A 0.006 N/A 1.475 N/A 0.015 N/A 2.025 N/A 1/4 N/A 1 1/2 N/A 2 N/A 7.0 N/A 37.5 N/A 51.4
1-402 N/A 0.275 N/A 0.006 N/A 1.600 N/A 0.015 N/A 2.150 N/A 1/4 N/A 1 5/8 N/A 2 1/8 N/A 7.0 N/A 40.6 N/A 54.6
1-403 N/A 0.275 N/A 0.006 N/A 1.725 N/A 0.015 N/A 2.275 N/A 1/4 N/A 1 3/4 N/A 2 1/4 N/A 7.0 N/A 43.8 N/A 57.8
1-404 N/A 0.275 N/A 0.006 N/A 1.850 N/A 0.015 N/A 2.400 N/A 1/4 N/A 1 7/8 N/A 2 3/8 N/A 7.0 N/A 47.0 N/A 61.0
1-405 N/A 0.275 N/A 0.006 N/A 1.975 N/A 0.018 N/A 2.525 N/A 1/4 N/A 2 N/A 2 1/2 N/A 7.0 N/A 50.2 N/A 64.1
1-406 N/A 0.275 N/A 0.006 N/A 2.100 N/A 0.018 N/A 2.650 N/A 1/4 N/A 2 1/8 N/A 2 5/8 N/A 7.0 N/A 53.3 N/A 67.3
1-407 N/A 0.275 N/A 0.006 N/A 2.225 N/A 0.018 N/A 2.775 N/A 1/4 N/A 2 1/4 N/A 2 3/4 N/A 7.0 N/A 56.5 N/A 70.5
1-408 N/A 0.275 N/A 0.006 N/A 2.350 N/A 0.018 N/A 2.900 N/A 1/4 N/A 2 3/8 N/A 2 7/8 N/A 7.0 N/A 59.7 N/A 73.7
1-409 N/A 0.275 N/A 0.006 N/A 2.475 N/A 0.020 N/A 3.025 N/A 1/4 N/A 2 1/2 N/A 3 N/A 7.0 N/A 62.9 N/A 76.8
1-410 N/A 0.275 N/A 0.006 N/A 2.600 N/A 0.020 N/A 3.150 N/A 1/4 N/A 2 5/8 N/A 3 1/8 N/A 7.0 N/A 66.0 N/A 80.0
Unit of Measure
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