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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)

1-261 N/A 0.139 N/A 0.004 N/A 6.734 N/A 0.040 N/A 7.012 N/A 1/8 N/A 6 3/4 N/A 7 N/A 3.5 N/A 171.0 N/A 178.1
1-262 N/A 0.139 N/A 0.004 N/A 6.984 N/A 0.040 N/A 7.262 N/A 1/8 N/A 7 N/A 7 1/4 N/A 3.5 N/A 177.4 N/A 184.5
1-263 N/A 0.139 N/A 0.004 N/A 7.234 N/A 0.045 N/A 7.512 N/A 1/8 N/A 7 1/2 N/A 7 1/2 N/A 3.5 N/A 183.7 N/A 190.8
1-264 N/A 0.139 N/A 0.004 N/A 7.484 N/A 0.045 N/A 7.762 N/A 1/8 N/A 7 1/4 N/A 7 3/4 N/A 3.5 N/A 190.1 N/A 197.2
1-265 N/A 0.139 N/A 0.004 N/A 7.734 N/A 0.045 N/A 8.012 N/A 1/8 N/A 7 3/4 N/A 8 N/A 3.5 N/A 196.4 N/A 203.5
1-266 N/A 0.139 N/A 0.004 N/A 7.984 N/A 0.045 N/A 8.262 N/A 1/8 N/A 8 N/A 8 1/4 N/A 3.5 N/A 202.8 N/A 209.9
1-267 N/A 0.139 N/A 0.004 N/A 8.234 N/A 0.050 N/A 8.512 N/A 1/8 N/A 8 1/4 N/A 8 1/2 N/A 3.5 N/A 209.1 N/A 216.2
1-268 N/A 0.139 N/A 0.004 N/A 8.484 N/A 0.050 N/A 8.762 N/A 1/8 N/A 8 1/2 N/A 8 3/4 N/A 3.5 N/A 215.5 N/A 222.6
1-269 N/A 0.139 N/A 0.004 N/A 8.734 N/A 0.050 N/A 9.012 N/A 1/8 N/A 8 3/4 N/A 9 N/A 3.5 N/A 221.8 N/A 228.9
1-270 N/A 0.139 N/A 0.004 N/A 8.984 N/A 0.050 N/A 9.262 N/A 1/8 N/A 9 N/A 9 1/4 N/A 3.5 N/A 228.2 N/A 235.3
1-271 N/A 0.139 N/A 0.004 N/A 9.234 N/A 0.055 N/A 9.512 N/A 1/8 N/A 9 1/4 N/A 9 1/2 N/A 3.5 N/A 234.5 N/A 241.6
1-272 N/A 0.139 N/A 0.004 N/A 9.484 N/A 0.055 N/A 9.762 N/A 1/8 N/A 9 1/2 N/A 9 3/4 N/A 3.5 N/A 240.9 N/A 248.0
1-273 N/A 0.139 N/A 0.004 N/A 9.734 N/A 0.055 N/A 10.012 N/A 1/8 N/A 9 3/4 N/A 10 N/A 3.5 N/A 247.2 N/A 254.3
1-274 N/A 0.139 N/A 0.004 N/A 9.984 N/A 0.055 N/A 10.262 N/A 1/8 N/A 10 N/A 10 1/4 N/A 3.5 N/A 253.6 N/A 260.7
1-275 N/A 0.139 N/A 0.004 N/A 10.484 N/A 0.055 N/A 10.762 N/A 1/8 N/A 10 1/2 N/A 10 3/4 N/A 3.5 N/A 266.3 N/A 273.4
1-276 N/A 0.139 N/A 0.004 N/A 10.984 N/A 0.065 N/A 11.262 N/A 1/8 N/A 11 N/A 11 1/4 N/A 3.5 N/A 279.0 N/A 286.1
1-277 N/A 0.139 N/A 0.004 N/A 11.484 N/A 0.065 N/A 11.762 N/A 1/8 N/A 11 1/2 N/A 11 3/4 N/A 3.5 N/A 291.7 N/A 298.8
1-278 N/A 0.139 N/A 0.004 N/A 11.984 N/A 0.065 N/A 12.262 N/A 1/8 N/A 12 N/A 12 1/4 N/A 3.5 N/A 304.4 N/A 311.5
1-279 N/A 0.139 N/A 0.004 N/A 12.984 N/A 0.065 N/A 13.262 N/A 1/8 N/A 13 N/A 13 1/4 N/A 3.5 N/A 329.8 N/A 336.9
1-280 N/A 0.139 N/A 0.004 N/A 13.984 N/A 0.065 N/A 14.262 N/A 1/8 N/A 14 N/A 14 1/4 N/A 3.5 N/A 355.2 N/A 362.3
1-281 N/A 0.139 N/A 0.004 N/A 14.984 N/A 0.065 N/A 15.262 N/A 1/8 N/A 15 N/A 15 1/4 N/A 3.5 N/A 380.6 N/A 387.7
1-282 N/A 0.139 N/A 0.004 N/A 15.955 N/A 0.075 N/A 16.233 N/A 1/8 N/A 16 N/A 16 1/4 N/A 3.5 N/A 405.3 N/A 412.3
1-283 N/A 0.139 N/A 0.004 N/A 16.955 N/A 0.080 N/A 17.233 N/A 1/8 N/A 17 N/A 17 1/4 N/A 3.5 N/A 430.7 N/A 437.7
1-284 N/A 0.139 N/A 0.004 N/A 17.955 N/A 0.085 N/A 18.233 N/A 1/8 N/A 18 N/A 18 1/4 N/A 3.5 N/A 456.1 N/A 463.1
1-286 N/A 0.139 N/A 0.004 N/A 19.960 N/A 0.090 N/A 20.238 N/A 1/8 N/A 20 N/A 20 1/4 N/A 3.5 N/A 507.0 N/A 514.0
Unit of Measure
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