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) |
---|---|---|---|---|---|---|---|---|---|---|---|
1-251 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 5.109 | I.D. Tolerance (±) N/A 0.035 | O.D. (REF) (inches) N/A 5.387 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 5 1/8 | Nominal O.D. (inches) N/A 5 3/8 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 129.8 | Metric O.D. (mm) N/A 136.8 |
1-252 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 5.234 | I.D. Tolerance (±) N/A 0.035 | O.D. (REF) (inches) N/A 5.512 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 5 1/4 | Nominal O.D. (inches) N/A 5 1/2 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 132.9 | Metric O.D. (mm) N/A 140.0 |
1-253 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 5.359 | I.D. Tolerance (±) N/A 0.035 | O.D. (REF) (inches) N/A 5.637 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 5 3/8 | Nominal O.D. (inches) N/A 5 5/8 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 136.1 | Metric O.D. (mm) N/A 143.2 |
1-254 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 5.484 | I.D. Tolerance (±) N/A 0.035 | O.D. (REF) (inches) N/A 5.762 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 5 1/2 | Nominal O.D. (inches) N/A 5 3/4 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 139.3 | Metric O.D. (mm) N/A 146.4 |
1-255 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 5.609 | I.D. Tolerance (±) N/A 0.035 | O.D. (REF) (inches) N/A 5.887 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 5 5/8 | Nominal O.D. (inches) N/A 5 7/8 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 142.5 | Metric O.D. (mm) N/A 149.5 |
1-256 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 5.734 | I.D. Tolerance (±) N/A 0.035 | O.D. (REF) (inches) N/A 6.012 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 5 3/4 | Nominal O.D. (inches) N/A 6 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 145.6 | Metric O.D. (mm) N/A 152.7 |
1-257 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 5.859 | I.D. Tolerance (±) N/A 0.035 | O.D. (REF) (inches) N/A 6.137 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 5 7/8 | Nominal O.D. (inches) N/A 6 1/8 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 148.8 | Metric O.D. (mm) N/A 155.9 |
1-258 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 5.984 | I.D. Tolerance (±) N/A 0.035 | O.D. (REF) (inches) N/A 6.262 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 6 | Nominal O.D. (inches) N/A 6 1/4 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 152.0 | Metric O.D. (mm) N/A 159.1 |
1-259 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 6.234 | I.D. Tolerance (±) N/A 0.040 | O.D. (REF) (inches) N/A 6.512 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 6 1/4 | Nominal O.D. (inches) N/A 6 1/2 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 158.3 | Metric O.D. (mm) N/A 165.4 |
1-260 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 6.484 | I.D. Tolerance (±) N/A 0.040 | O.D. (REF) (inches) N/A 6.762 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 6 1/2 | Nominal O.D. (inches) N/A 6 3/4 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 164.7 | Metric O.D. (mm) N/A 171.8 |
1-261 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 6.734 | I.D. Tolerance (±) N/A 0.040 | O.D. (REF) (inches) N/A 7.012 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 6 3/4 | Nominal O.D. (inches) N/A 7 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 171.0 | Metric O.D. (mm) N/A 178.1 |
1-262 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 6.984 | I.D. Tolerance (±) N/A 0.040 | O.D. (REF) (inches) N/A 7.262 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 7 | Nominal O.D. (inches) N/A 7 1/4 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 177.4 | Metric O.D. (mm) N/A 184.5 |
1-263 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 7.234 | I.D. Tolerance (±) N/A 0.045 | O.D. (REF) (inches) N/A 7.512 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 7 1/2 | Nominal O.D. (inches) N/A 7 1/2 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 183.7 | Metric O.D. (mm) N/A 190.8 |
1-264 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 7.484 | I.D. Tolerance (±) N/A 0.045 | O.D. (REF) (inches) N/A 7.762 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 7 1/4 | Nominal O.D. (inches) N/A 7 3/4 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 190.1 | Metric O.D. (mm) N/A 197.2 |
1-265 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 7.734 | I.D. Tolerance (±) N/A 0.045 | O.D. (REF) (inches) N/A 8.012 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 7 3/4 | Nominal O.D. (inches) N/A 8 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 196.4 | Metric O.D. (mm) N/A 203.5 |
1-266 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 7.984 | I.D. Tolerance (±) N/A 0.045 | O.D. (REF) (inches) N/A 8.262 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 8 | Nominal O.D. (inches) N/A 8 1/4 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 202.8 | Metric O.D. (mm) N/A 209.9 |
1-267 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 8.234 | I.D. Tolerance (±) N/A 0.050 | O.D. (REF) (inches) N/A 8.512 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 8 1/4 | Nominal O.D. (inches) N/A 8 1/2 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 209.1 | Metric O.D. (mm) N/A 216.2 |
1-268 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 8.484 | I.D. Tolerance (±) N/A 0.050 | O.D. (REF) (inches) N/A 8.762 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 8 1/2 | Nominal O.D. (inches) N/A 8 3/4 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 215.5 | Metric O.D. (mm) N/A 222.6 |
1-269 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 8.734 | I.D. Tolerance (±) N/A 0.050 | O.D. (REF) (inches) N/A 9.012 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 8 3/4 | Nominal O.D. (inches) N/A 9 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 221.8 | Metric O.D. (mm) N/A 228.9 |
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 |
1-271 | 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 |
1-272 | 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 |
1-273 | 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 |
1-274 | 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 |
1-275 | 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 |