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) |
---|---|---|---|---|---|---|---|---|---|---|---|
1-240 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 3.734 | I.D. Tolerance (±) N/A 0.028 | O.D. (REF) (inches) N/A 4.012 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 3 3/4 | Nominal O.D. (inches) N/A 4 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 94.8 | Metric O.D. (mm) N/A 101.9 |
1-241 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 3.859 | I.D. Tolerance (±) N/A 0.028 | O.D. (REF) (inches) N/A 4.137 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 3 7/8 | Nominal O.D. (inches) N/A 4 1/8 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 98.0 | Metric O.D. (mm) N/A 105.1 |
1-242 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 3.984 | I.D. Tolerance (±) N/A 0.028 | O.D. (REF) (inches) N/A 4.262 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 4 | Nominal O.D. (inches) N/A 4 1/4 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 101.2 | Metric O.D. (mm) N/A 108.3 |
1-243 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 4.109 | I.D. Tolerance (±) N/A 0.028 | O.D. (REF) (inches) N/A 4.387 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 4 1/8 | Nominal O.D. (inches) N/A 4 3/8 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 104.4 | Metric O.D. (mm) N/A 111.4 |
1-244 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 4.234 | I.D. Tolerance (±) N/A 0.030 | O.D. (REF) (inches) N/A 4.512 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 4 1/4 | Nominal O.D. (inches) N/A 4 1/2 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 107.5 | Metric O.D. (mm) N/A 114.6 |
1-245 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 4.359 | I.D. Tolerance (±) N/A 0.030 | O.D. (REF) (inches) N/A 4.637 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 4 3/8 | Nominal O.D. (inches) N/A 4 5/8 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 110.7 | Metric O.D. (mm) N/A 117.8 |
1-246 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 4.484 | I.D. Tolerance (±) N/A 0.030 | O.D. (REF) (inches) N/A 4.762 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 4.5 | Nominal O.D. (inches) N/A 4 3/4 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 113.9 | Metric O.D. (mm) N/A 121.0 |
1-247 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 4.609 | I.D. Tolerance (±) N/A 0.030 | O.D. (REF) (inches) N/A 4.887 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 4 5/8 | Nominal O.D. (inches) N/A 4 7/8 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 117.1 | Metric O.D. (mm) N/A 124.1 |
1-248 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 4.734 | I.D. Tolerance (±) N/A 0.030 | O.D. (REF) (inches) N/A 5.012 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 4 3/4 | Nominal O.D. (inches) N/A 5 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 120.2 | Metric O.D. (mm) N/A 127.3 |
1-249 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 4.859 | I.D. Tolerance (±) N/A 0.035 | O.D. (REF) (inches) N/A 5.137 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 4 7/8 | Nominal O.D. (inches) N/A 5 1/8 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 123.4 | Metric O.D. (mm) N/A 130.5 |
1-250 | C/S (inches) N/A 0.139 | C/S Tolerance (±) N/A 0.004 | I.D. (inches) N/A 4.984 | I.D. Tolerance (±) N/A 0.035 | O.D. (REF) (inches) N/A 5.262 | Nominal C/S (inches) N/A 1/8 | Nominal I.D. (inches) N/A 5 | Nominal O.D. (inches) N/A 5 1/4 | Metric C/S (mm) N/A 3.5 | Metric I.D. (mm) N/A 126.6 | Metric O.D. (mm) N/A 133.7 |
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 |