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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)

1-461 N/A 0.275 N/A 0.006 N/A 15.955 N/A 0.075 N/A 16.505 N/A 1/4 N/A 16 N/A 16 1/2 N/A 7.0 N/A 405.3 N/A 419.2
1-462 N/A 0.275 N/A 0.006 N/A 16.455 N/A 0.075 N/A 17.005 N/A 1/4 N/A 16 1/2 N/A 17 N/A 7.0 N/A 418.0 N/A 431.9
1-463 N/A 0.275 N/A 0.006 N/A 16.955 N/A 0.080 N/A 17.505 N/A 1/4 N/A 17 N/A 17 1/2 N/A 7.0 N/A 430.7 N/A 444.6
1-464 N/A 0.275 N/A 0.006 N/A 17.455 N/A 0.085 N/A 18.005 N/A 1/4 N/A 17 1/2 N/A 18 N/A 7.0 N/A 443.4 N/A 457.3
1-465 N/A 0.275 N/A 0.006 N/A 17.955 N/A 0.085 N/A 18.505 N/A 1/4 N/A 18 N/A 18 1/2 N/A 7.0 N/A 456.1 N/A 470.0
1-466 N/A 0.275 N/A 0.006 N/A 18.455 N/A 0.085 N/A 19.005 N/A 1/4 N/A 18 1/2 N/A 19 N/A 7.0 N/A 468.8 N/A 482.7
1-467 N/A 0.275 N/A 0.006 N/A 18.955 N/A 0.090 N/A 19.505 N/A 1/4 N/A 19 N/A 19 1/2 N/A 7.0 N/A 481.5 N/A 495.4
1-468 N/A 0.275 N/A 0.006 N/A 19.455 N/A 0.090 N/A 20.005 N/A 1/4 N/A 19 1/2 N/A 20 N/A 7.0 N/A 494.2 N/A 508.1
1-469 N/A 0.275 N/A 0.006 N/A 19.955 N/A 0.095 N/A 20.505 N/A 1/4 N/A 20 N/A 20 1/2 N/A 7.0 N/A 506.9 N/A 520.8
1-470 N/A 0.275 N/A 0.006 N/A 20.955 N/A 0.095 N/A 21.505 N/A 1/4 N/A 21 N/A 21 1/2 N/A 7.0 N/A 532.3 N/A 546.2
1-471 N/A 0.275 N/A 0.006 N/A 21.955 N/A 0.100 N/A 22.505 N/A 1/4 N/A 22 N/A 22 1/2 N/A 7.0 N/A 557.7 N/A 571.6
1-472 N/A 0.275 N/A 0.006 N/A 22.940 N/A 0.105 N/A 23.490 N/A 1/4 N/A 23 N/A 23 1/2 N/A 7.0 N/A 582.7 N/A 596.6
1-473 N/A 0.275 N/A 0.006 N/A 23.940 N/A 0.110 N/A 24.490 N/A 1/4 N/A 24 N/A 24 1/2 N/A 7.0 N/A 608.1 N/A 622.0
1-474 N/A 0.275 N/A 0.006 N/A 24.940 N/A 0.115 N/A 25.490 N/A 1/4 N/A 25 N/A 25 1/2 N/A 7.0 N/A 633.5 N/A 647.4
1-475 N/A 0.275 N/A 0.006 N/A 25.940 N/A 0.120 N/A 26.490 N/A 1/4 N/A 26 N/A 26 1/2 N/A 7.0 N/A 658.9 N/A 672.8
1-476 N/A 0.275 N/A 0.006 N/A 26.955 N/A 0.120 N/A 27.505 N/A 1/4 N/A 27 N/A 27 1/2 N/A 7.0 N/A 684.7 N/A 698.6
1-901 N/A 0.056 N/A 0.003 N/A 0.185 N/A 0.005 N/A 0.297 N/A N/A N/A N/A 1.4 N/A 4.7 N/A 7.5
1-902 N/A 0.064 N/A 0.003 N/A 0.239 N/A 0.005 N/A 0.367 N/A N/A N/A N/A 1.6 N/A 6.1 N/A 9.3
1-903 N/A 0.064 N/A 0.003 N/A 0.301 N/A 0.005 N/A 0.429 N/A N/A N/A N/A 1.6 N/A 7.6 N/A 10.9
1-904 N/A 0.072 N/A 0.003 N/A 0.351 N/A 0.005 N/A 0.495 N/A N/A N/A N/A 1.8 N/A 8.9 N/A 12.6
1-905 N/A 0.072 N/A 0.003 N/A 0.414 N/A 0.005 N/A 0.558 N/A N/A N/A N/A 1.8 N/A 10.5 N/A 14.2
1-906 N/A 0.078 N/A 0.003 N/A 0.468 N/A 0.005 N/A 0.624 N/A N/A N/A N/A 2.0 N/A 11.9 N/A 15.8
1-907 N/A 0.082 N/A 0.003 N/A 0.530 N/A 0.005 N/A 0.694 N/A N/A N/A N/A 2.1 N/A 13.5 N/A 17.6
1-908 N/A 0.087 N/A 0.003 N/A 0.644 N/A 0.009 N/A 0.818 N/A N/A N/A N/A 2.2 N/A 16.4 N/A 20.8
1-909 N/A 0.097 N/A 0.003 N/A 0.706 N/A 0.009 N/A 0.900 N/A N/A N/A N/A 2.5 N/A 17.9 N/A 22.9
Unit of Measure
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