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) |
---|---|---|---|---|---|---|---|---|---|---|---|
1-277 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 11.484 | I.D. Tolerance (±) N/A 0.065 | O.D. (REF) (inches) N/A 11.762 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 11 1/2 | Nominal O.D. (inches) N/A 11 3/4 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 291.7 | Metric O.D. (mm) N/A 298.8 |
1-451 | C/S (inches) N/A 0.275 | C/S Tolerance (±) N/A 0.006 | I.D. (inches) N/A 10.975 | I.D. Tolerance (±) N/A 0.060 | O.D. (REF) (inches) N/A 11.525 | Nominal C/S (inches) N/A 1/4 | Nominal I.D. (inches) N/A 11 | Nominal O.D. (inches) N/A 11 1/2 | Metric C/S (mm) N/A 7.0 | Metric I.D. (mm) N/A 278.8 | Metric O.D. (mm) N/A 292.7 |
1-379 | C/S (inches) N/A 0.210 | C/S Tolerance (±) N/A 0.005 | I.D. (inches) N/A 10.975 | I.D. Tolerance (±) N/A 0.060 | O.D. (REF) (inches) N/A 11.395 | Nominal C/S (inches) N/A 3/16 | Nominal I.D. (inches) N/A 11 | Nominal O.D. (inches) N/A 11 3/8 | Metric C/S (mm) N/A 5.3 | Metric I.D. (mm) N/A 278.8 | Metric O.D. (mm) N/A 289.4 |
1-276 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 10.984 | I.D. Tolerance (±) N/A 0.065 | O.D. (REF) (inches) N/A 11.262 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 11 | Nominal O.D. (inches) N/A 11 1/4 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 279.0 | Metric O.D. (mm) N/A 286.1 |
1-450 | C/S (inches) N/A 0.275 | C/S Tolerance (±) N/A 0.006 | I.D. (inches) N/A 10.475 | I.D. Tolerance (±) N/A 0.060 | O.D. (REF) (inches) N/A 11.025 | Nominal C/S (inches) N/A 1/4 | Nominal I.D. (inches) N/A 10 1/2 | Nominal O.D. (inches) N/A 11 | Metric C/S (mm) N/A 7.0 | Metric I.D. (mm) N/A 266.1 | Metric O.D. (mm) N/A 280.0 |
1-378 | C/S (inches) N/A 0.210 | C/S Tolerance (±) N/A 0.005 | I.D. (inches) N/A 10.475 | I.D. Tolerance (±) N/A 0.060 | O.D. (REF) (inches) N/A 10.895 | Nominal C/S (inches) N/A 3/16 | Nominal I.D. (inches) N/A 10 1/2 | Nominal O.D. (inches) N/A 10 7/8 | Metric C/S (mm) N/A 5.3 | Metric I.D. (mm) N/A 266.1 | Metric O.D. (mm) N/A 276.7 |
1-275 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 10.484 | I.D. Tolerance (±) N/A 0.055 | O.D. (REF) (inches) N/A 10.762 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 10 1/2 | Nominal O.D. (inches) N/A 10 3/4 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 266.3 | Metric O.D. (mm) N/A 273.4 |
1-449 | C/S (inches) N/A 0.275 | C/S Tolerance (±) N/A 0.006 | I.D. (inches) N/A 9.975 | I.D. Tolerance (±) N/A 0.055 | O.D. (REF) (inches) N/A 10.525 | Nominal C/S (inches) N/A 1/4 | Nominal I.D. (inches) N/A 10 | Nominal O.D. (inches) N/A 10 1/2 | Metric C/S (mm) N/A 7.0 | Metric I.D. (mm) N/A 253.4 | Metric O.D. (mm) N/A 267.3 |
1-377 | C/S (inches) N/A 0.210 | C/S Tolerance (±) N/A 0.005 | I.D. (inches) N/A 9.975 | I.D. Tolerance (±) N/A 0.055 | O.D. (REF) (inches) N/A 10.395 | Nominal C/S (inches) N/A 3/16 | Nominal I.D. (inches) N/A 10 | Nominal O.D. (inches) N/A 10 3/8 | Metric C/S (mm) N/A 5.3 | Metric I.D. (mm) N/A 253.4 | Metric O.D. (mm) N/A 264.0 |
1-274 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 9.984 | I.D. Tolerance (±) N/A 0.055 | O.D. (REF) (inches) N/A 10.262 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 10 | Nominal O.D. (inches) N/A 10 1/4 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 253.6 | Metric O.D. (mm) N/A 260.7 |
1-179 | C/S (inches) N/A 0.103 | C/S Tolerance (±) N/A 0.003 | I.D. (inches) N/A 9.987 | I.D. Tolerance (±) N/A 0.055 | O.D. (REF) (inches) N/A 10.193 | Nominal C/S (inches) N/A 3/32 | Nominal I.D. (inches) N/A 10 | Nominal O.D. (inches) N/A 10 3/16 | Metric C/S (mm) N/A 2.6 | Metric I.D. (mm) N/A 253.7 | Metric O.D. (mm) N/A 258.9 |
1-376 | C/S (inches) N/A 0.210 | C/S Tolerance (±) N/A 0.005 | I.D. (inches) N/A 9.725 | I.D. Tolerance (±) N/A 0.055 | O.D. (REF) (inches) N/A 10.145 | Nominal C/S (inches) N/A 3/16 | Nominal I.D. (inches) N/A 9 3/4 | Nominal O.D. (inches) N/A 10 1/8 | Metric C/S (mm) N/A 5.3 | Metric I.D. (mm) N/A 247.0 | Metric O.D. (mm) N/A 257.7 |
1-448 | C/S (inches) N/A 0.275 | C/S Tolerance (±) N/A 0.006 | I.D. (inches) N/A 9.475 | I.D. Tolerance (±) N/A 0.055 | O.D. (REF) (inches) N/A 10.025 | Nominal C/S (inches) N/A 1/4 | Nominal I.D. (inches) N/A 9 1/2 | Nominal O.D. (inches) N/A 10 | Metric C/S (mm) N/A 7.0 | Metric I.D. (mm) N/A 240.7 | Metric O.D. (mm) N/A 254.6 |
1-273 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 9.734 | I.D. Tolerance (±) N/A 0.055 | O.D. (REF) (inches) N/A 10.012 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 9 3/4 | Nominal O.D. (inches) N/A 10 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 247.2 | Metric O.D. (mm) N/A 254.3 |
1-178 | C/S (inches) N/A 0.103 | C/S Tolerance (±) N/A 0.003 | I.D. (inches) N/A 9.737 | I.D. Tolerance (±) N/A 0.055 | O.D. (REF) (inches) N/A 9.943 | Nominal C/S (inches) N/A 3/32 | Nominal I.D. (inches) N/A 9 3/4 | Nominal O.D. (inches) N/A 9 15/16 | Metric C/S (mm) N/A 2.6 | Metric I.D. (mm) N/A 247.3 | Metric O.D. (mm) N/A 252.6 |
1-375 | C/S (inches) N/A 0.210 | C/S Tolerance (±) N/A 0.005 | I.D. (inches) N/A 9.475 | I.D. Tolerance (±) N/A 0.055 | O.D. (REF) (inches) N/A 9.895 | Nominal C/S (inches) N/A 3/16 | Nominal I.D. (inches) N/A 9 1/2 | Nominal O.D. (inches) N/A 9 7/8 | Metric C/S (mm) N/A 5.3 | Metric I.D. (mm) N/A 240.7 | Metric O.D. (mm) N/A 251.3 |
1-272 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 9.484 | I.D. Tolerance (±) N/A 0.055 | O.D. (REF) (inches) N/A 9.762 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 9 1/2 | Nominal O.D. (inches) N/A 9 3/4 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 240.9 | Metric O.D. (mm) N/A 248.0 |
1-177 | C/S (inches) N/A 0.103 | C/S Tolerance (±) N/A 0.003 | I.D. (inches) N/A 9.487 | I.D. Tolerance (±) N/A 0.055 | O.D. (REF) (inches) N/A 9.693 | Nominal C/S (inches) N/A 3/32 | Nominal I.D. (inches) N/A 9 1/2 | Nominal O.D. (inches) N/A 9 11/16 | Metric C/S (mm) N/A 2.6 | Metric I.D. (mm) N/A 241.0 | Metric O.D. (mm) N/A 246.2 |
1-374 | C/S (inches) N/A 0.210 | C/S Tolerance (±) N/A 0.005 | I.D. (inches) N/A 9.225 | I.D. Tolerance (±) N/A 0.055 | O.D. (REF) (inches) N/A 9.645 | Nominal C/S (inches) N/A 3/16 | Nominal I.D. (inches) N/A 9 1/4 | Nominal O.D. (inches) N/A 9 5/8 | Metric C/S (mm) N/A 5.3 | Metric I.D. (mm) N/A 234.3 | Metric O.D. (mm) N/A 245.0 |
1-447 | C/S (inches) N/A 0.275 | C/S Tolerance (±) N/A 0.006 | I.D. (inches) N/A 8.975 | I.D. Tolerance (±) N/A 0.055 | O.D. (REF) (inches) N/A 9.525 | Nominal C/S (inches) N/A 1/4 | Nominal I.D. (inches) N/A 9 | Nominal O.D. (inches) N/A 9 1/2 | Metric C/S (mm) N/A 7.0 | Metric I.D. (mm) N/A 228.0 | Metric O.D. (mm) N/A 241.9 |
1-271 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 9.234 | I.D. Tolerance (±) N/A 0.055 | O.D. (REF) (inches) N/A 9.512 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 9 1/4 | Nominal O.D. (inches) N/A 9 1/2 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 234.5 | Metric O.D. (mm) N/A 241.6 |
1-176 | C/S (inches) N/A 0.103 | C/S Tolerance (±) N/A 0.003 | I.D. (inches) N/A 9.237 | I.D. Tolerance (±) N/A 0.055 | O.D. (REF) (inches) N/A 9.443 | Nominal C/S (inches) N/A 3/32 | Nominal I.D. (inches) N/A 9 1/4 | Nominal O.D. (inches) N/A 9 7/16 | Metric C/S (mm) N/A 2.6 | Metric I.D. (mm) N/A 234.6 | Metric O.D. (mm) N/A 239.9 |
1-373 | C/S (inches) N/A 0.210 | C/S Tolerance (±) N/A 0.005 | I.D. (inches) N/A 8.975 | I.D. Tolerance (±) N/A 0.050 | O.D. (REF) (inches) N/A 9.395 | Nominal C/S (inches) N/A 3/16 | Nominal I.D. (inches) N/A 9 | Nominal O.D. (inches) N/A 9 3/8 | Metric C/S (mm) N/A 5.3 | Metric I.D. (mm) N/A 228.0 | Metric O.D. (mm) N/A 238.6 |
1-270 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 8.984 | I.D. Tolerance (±) N/A 0.050 | O.D. (REF) (inches) N/A 9.262 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 9 | Nominal O.D. (inches) N/A 9 1/4 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 228.2 | Metric O.D. (mm) N/A 235.3 |
1-175 | C/S (inches) N/A 0.103 | C/S Tolerance (±) N/A 0.003 | I.D. (inches) N/A 8.987 | I.D. Tolerance (±) N/A 0.050 | O.D. (REF) (inches) N/A 9.193 | Nominal C/S (inches) N/A 3/32 | Nominal I.D. (inches) N/A 9 | Nominal O.D. (inches) N/A 9 3/16 | Metric C/S (mm) N/A 2.6 | Metric I.D. (mm) N/A 228.3 | Metric O.D. (mm) N/A 233.5 |