Standard Size O-Rings (Nominal Dimensions)
O-Rings
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.
Click here to view our 48 (5Mb) Catalog illustrated with full-size drawings of Standard Size O-Rings plus Dimensions and Tolerances.
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) |
---|---|---|---|---|---|---|---|---|---|---|---|
1-476 | C/S (inches) N/A 0.275 | C/S Tolerance (±) N/A 0.006 | I.D. (inches) N/A 26.955 | I.D. Tolerance (±) N/A 0.120 | O.D. (REF) (inches) N/A 27.505 | Nominal C/S (inches) N/A 1/4 | Nominal I.D. (inches) N/A 27 | Nominal O.D. (inches) N/A 27 1/2 | Metric C/S (mm) N/A 7.0 | Metric I.D. (mm) N/A 684.7 | Metric O.D. (mm) N/A 698.6 |
1-396 | C/S (inches) N/A 0.210 | C/S Tolerance (±) N/A 0.005 | I.D. (inches) N/A 26.940 | I.D. Tolerance (±) N/A 0.120 | O.D. (REF) (inches) N/A 27.360 | Nominal C/S (inches) N/A 3/16 | Nominal I.D. (inches) N/A 27 | Nominal O.D. (inches) N/A 27 3/8 | Metric C/S (mm) N/A 5.3 | Metric I.D. (mm) N/A 684.3 | Metric O.D. (mm) N/A 695.0 |
1-475 | C/S (inches) N/A 0.275 | C/S Tolerance (±) N/A 0.006 | I.D. (inches) N/A 25.940 | I.D. Tolerance (±) N/A 0.120 | O.D. (REF) (inches) N/A 26.490 | Nominal C/S (inches) N/A 1/4 | Nominal I.D. (inches) N/A 26 | Nominal O.D. (inches) N/A 26 1/2 | Metric C/S (mm) N/A 7.0 | Metric I.D. (mm) N/A 658.9 | Metric O.D. (mm) N/A 672.8 |
1-395 | C/S (inches) N/A 0.210 | C/S Tolerance (±) N/A 0.005 | I.D. (inches) N/A 25.940 | I.D. Tolerance (±) N/A 0.120 | O.D. (REF) (inches) N/A 26.360 | Nominal C/S (inches) N/A 3/16 | Nominal I.D. (inches) N/A 26 | Nominal O.D. (inches) N/A 26 3/8 | Metric C/S (mm) N/A 5.3 | Metric I.D. (mm) N/A 658.9 | Metric O.D. (mm) N/A 669.5 |
1-474 | C/S (inches) N/A 0.275 | C/S Tolerance (±) N/A 0.006 | I.D. (inches) N/A 24.940 | I.D. Tolerance (±) N/A 0.115 | O.D. (REF) (inches) N/A 25.490 | Nominal C/S (inches) N/A 1/4 | Nominal I.D. (inches) N/A 25 | Nominal O.D. (inches) N/A 25 1/2 | Metric C/S (mm) N/A 7.0 | Metric I.D. (mm) N/A 633.5 | Metric O.D. (mm) N/A 647.4 |
1-394 | C/S (inches) N/A 0.210 | C/S Tolerance (±) N/A 0.005 | I.D. (inches) N/A 24.940 | I.D. Tolerance (±) N/A 0.115 | O.D. (REF) (inches) N/A 25.360 | Nominal C/S (inches) N/A 3/16 | Nominal I.D. (inches) N/A 25 | Nominal O.D. (inches) N/A 25 3/8 | Metric C/S (mm) N/A 5.3 | Metric I.D. (mm) N/A 633.5 | Metric O.D. (mm) N/A 644.1 |
1-473 | C/S (inches) N/A 0.275 | C/S Tolerance (±) N/A 0.006 | I.D. (inches) N/A 23.940 | I.D. Tolerance (±) N/A 0.110 | O.D. (REF) (inches) N/A 24.490 | Nominal C/S (inches) N/A 1/4 | Nominal I.D. (inches) N/A 24 | Nominal O.D. (inches) N/A 24 1/2 | Metric C/S (mm) N/A 7.0 | Metric I.D. (mm) N/A 608.1 | Metric O.D. (mm) N/A 622.0 |
1-393 | C/S (inches) N/A 0.210 | C/S Tolerance (±) N/A 0.005 | I.D. (inches) N/A 23.940 | I.D. Tolerance (±) N/A 0.110 | O.D. (REF) (inches) N/A 24.360 | Nominal C/S (inches) N/A 3/16 | Nominal I.D. (inches) N/A 24 | Nominal O.D. (inches) N/A 24 3/8 | Metric C/S (mm) N/A 5.3 | Metric I.D. (mm) N/A 608.1 | Metric O.D. (mm) N/A 618.7 |
1-472 | C/S (inches) N/A 0.275 | C/S Tolerance (±) N/A 0.006 | I.D. (inches) N/A 22.940 | I.D. Tolerance (±) N/A 0.105 | O.D. (REF) (inches) N/A 23.490 | Nominal C/S (inches) N/A 1/4 | Nominal I.D. (inches) N/A 23 | Nominal O.D. (inches) N/A 23 1/2 | Metric C/S (mm) N/A 7.0 | Metric I.D. (mm) N/A 582.7 | Metric O.D. (mm) N/A 596.6 |
1-392 | C/S (inches) N/A 0.210 | C/S Tolerance (±) N/A 0.005 | I.D. (inches) N/A 22.940 | I.D. Tolerance (±) N/A 0.105 | O.D. (REF) (inches) N/A 23.360 | Nominal C/S (inches) N/A 3/16 | Nominal I.D. (inches) N/A 23 | Nominal O.D. (inches) N/A 23 3/8 | Metric C/S (mm) N/A 5.3 | Metric I.D. (mm) N/A 582.7 | Metric O.D. (mm) N/A 593.3 |
1-471 | C/S (inches) N/A 0.275 | C/S Tolerance (±) N/A 0.006 | I.D. (inches) N/A 21.955 | I.D. Tolerance (±) N/A 0.100 | O.D. (REF) (inches) N/A 22.505 | Nominal C/S (inches) N/A 1/4 | Nominal I.D. (inches) N/A 22 | Nominal O.D. (inches) N/A 22 1/2 | Metric C/S (mm) N/A 7.0 | Metric I.D. (mm) N/A 557.7 | Metric O.D. (mm) N/A 571.6 |
1-391 | C/S (inches) N/A 0.210 | C/S Tolerance (±) N/A 0.005 | I.D. (inches) N/A 21.955 | I.D. Tolerance (±) N/A 0.095 | O.D. (REF) (inches) N/A 22.415 | Nominal C/S (inches) N/A 3/16 | Nominal I.D. (inches) N/A 22 | Nominal O.D. (inches) N/A 22 3/8 | Metric C/S (mm) N/A 5.3 | Metric I.D. (mm) N/A 557.7 | Metric O.D. (mm) N/A 569.3 |
1-470 | C/S (inches) N/A 0.275 | C/S Tolerance (±) N/A 0.006 | I.D. (inches) N/A 20.955 | I.D. Tolerance (±) N/A 0.095 | O.D. (REF) (inches) N/A 21.505 | Nominal C/S (inches) N/A 1/4 | Nominal I.D. (inches) N/A 21 | Nominal O.D. (inches) N/A 21 1/2 | Metric C/S (mm) N/A 7.0 | Metric I.D. (mm) N/A 532.3 | Metric O.D. (mm) N/A 546.2 |
1-390 | C/S (inches) N/A 0.210 | C/S Tolerance (±) N/A 0.005 | I.D. (inches) N/A 20.955 | I.D. Tolerance (±) N/A 0.095 | O.D. (REF) (inches) N/A 21.375 | Nominal C/S (inches) N/A 3/16 | Nominal I.D. (inches) N/A 21 | Nominal O.D. (inches) N/A 21 3/8 | Metric C/S (mm) N/A 5.3 | Metric I.D. (mm) N/A 532.3 | Metric O.D. (mm) N/A 542.9 |
1-469 | C/S (inches) N/A 0.275 | C/S Tolerance (±) N/A 0.006 | I.D. (inches) N/A 19.955 | I.D. Tolerance (±) N/A 0.095 | O.D. (REF) (inches) N/A 20.505 | Nominal C/S (inches) N/A 1/4 | Nominal I.D. (inches) N/A 20 | Nominal O.D. (inches) N/A 20 1/2 | Metric C/S (mm) N/A 7.0 | Metric I.D. (mm) N/A 506.9 | Metric O.D. (mm) N/A 520.8 |
1-389 | C/S (inches) N/A 0.210 | C/S Tolerance (±) N/A 0.005 | I.D. (inches) N/A 19.955 | I.D. Tolerance (±) N/A 0.095 | O.D. (REF) (inches) N/A 20.375 | Nominal C/S (inches) N/A 3/16 | Nominal I.D. (inches) N/A 20 | Nominal O.D. (inches) N/A 20 3/8 | Metric C/S (mm) N/A 5.3 | Metric I.D. (mm) N/A 506.9 | Metric O.D. (mm) N/A 517.5 |
1-286 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 19.960 | I.D. Tolerance (±) N/A 0.090 | O.D. (REF) (inches) N/A 20.238 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 20 | Nominal O.D. (inches) N/A 20 1/4 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 507.0 | Metric O.D. (mm) N/A 514.0 |
1-468 | C/S (inches) N/A 0.275 | C/S Tolerance (±) N/A 0.006 | I.D. (inches) N/A 19.455 | I.D. Tolerance (±) N/A 0.090 | O.D. (REF) (inches) N/A 20.005 | Nominal C/S (inches) N/A 1/4 | Nominal I.D. (inches) N/A 19 1/2 | Nominal O.D. (inches) N/A 20 | Metric C/S (mm) N/A 7.0 | Metric I.D. (mm) N/A 494.2 | Metric O.D. (mm) N/A 508.1 |
1-467 | C/S (inches) N/A 0.275 | C/S Tolerance (±) N/A 0.006 | I.D. (inches) N/A 18.955 | I.D. Tolerance (±) N/A 0.090 | O.D. (REF) (inches) N/A 19.505 | Nominal C/S (inches) N/A 1/4 | Nominal I.D. (inches) N/A 19 | Nominal O.D. (inches) N/A 19 1/2 | Metric C/S (mm) N/A 7.0 | Metric I.D. (mm) N/A 481.5 | Metric O.D. (mm) N/A 495.4 |
1-388 | C/S (inches) N/A 0.210 | C/S Tolerance (±) N/A 0.005 | I.D. (inches) N/A 18.955 | I.D. Tolerance (±) N/A 0.090 | O.D. (REF) (inches) N/A 19.375 | Nominal C/S (inches) N/A 3/16 | Nominal I.D. (inches) N/A 19 | Nominal O.D. (inches) N/A 19 3/8 | Metric C/S (mm) N/A 5.3 | Metric I.D. (mm) N/A 481.5 | Metric O.D. (mm) N/A 492.1 |
1-466 | C/S (inches) N/A 0.275 | C/S Tolerance (±) N/A 0.006 | I.D. (inches) N/A 18.455 | I.D. Tolerance (±) N/A 0.085 | O.D. (REF) (inches) N/A 19.005 | Nominal C/S (inches) N/A 1/4 | Nominal I.D. (inches) N/A 18 1/2 | Nominal O.D. (inches) N/A 19 | Metric C/S (mm) N/A 7.0 | Metric I.D. (mm) N/A 468.8 | Metric O.D. (mm) N/A 482.7 |
1-465 | C/S (inches) N/A 0.275 | C/S Tolerance (±) N/A 0.006 | I.D. (inches) N/A 17.955 | I.D. Tolerance (±) N/A 0.085 | O.D. (REF) (inches) N/A 18.505 | Nominal C/S (inches) N/A 1/4 | Nominal I.D. (inches) N/A 18 | Nominal O.D. (inches) N/A 18 1/2 | Metric C/S (mm) N/A 7.0 | Metric I.D. (mm) N/A 456.1 | Metric O.D. (mm) N/A 470.0 |
1-387 | C/S (inches) N/A 0.210 | C/S Tolerance (±) N/A 0.005 | I.D. (inches) N/A 17.955 | I.D. Tolerance (±) N/A 0.085 | O.D. (REF) (inches) N/A 18.375 | Nominal C/S (inches) N/A 3/16 | Nominal I.D. (inches) N/A 18 | Nominal O.D. (inches) N/A 18 3/8 | Metric C/S (mm) N/A 5.3 | Metric I.D. (mm) N/A 456.1 | Metric O.D. (mm) N/A 466.7 |
1-284 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 17.955 | I.D. Tolerance (±) N/A 0.085 | O.D. (REF) (inches) N/A 18.233 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 18 | Nominal O.D. (inches) N/A 18 1/4 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 456.1 | Metric O.D. (mm) N/A 463.1 |
1-464 | C/S (inches) N/A 0.275 | C/S Tolerance (±) N/A 0.006 | I.D. (inches) N/A 17.455 | I.D. Tolerance (±) N/A 0.085 | O.D. (REF) (inches) N/A 18.005 | Nominal C/S (inches) N/A 1/4 | Nominal I.D. (inches) N/A 17 1/2 | Nominal O.D. (inches) N/A 18 | Metric C/S (mm) N/A 7.0 | Metric I.D. (mm) N/A 443.4 | Metric O.D. (mm) N/A 457.3 |