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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)

1-165 N/A 0.103 N/A 0.003 N/A 6.487 N/A 0.040 N/A 6.693 N/A 3/32 N/A 6 1/2 N/A 6 11/16 N/A 2.6 N/A 164.8 N/A 170.0
1-166 N/A 0.103 N/A 0.003 N/A 6.737 N/A 0.040 N/A 6.943 N/A 3/32 N/A 6 3/4 N/A 6 15/16 N/A 2.6 N/A 171.1 N/A 176.4
1-167 N/A 0.103 N/A 0.003 N/A 6.987 N/A 0.040 N/A 7.193 N/A 3/32 N/A 7 N/A 7 3/16 N/A 2.6 N/A 177.5 N/A 182.7
1-168 N/A 0.103 N/A 0.003 N/A 7.237 N/A 0.045 N/A 7.443 N/A 3/32 N/A 7 1/2 N/A 7 7/16 N/A 2.6 N/A 183.8 N/A 189.1
1-169 N/A 0.103 N/A 0.003 N/A 7.487 N/A 0.045 N/A 7.693 N/A 3/32 N/A 7 1/4 N/A 7 11/16 N/A 2.6 N/A 190.2 N/A 195.4
1-170 N/A 0.103 N/A 0.003 N/A 7.737 N/A 0.045 N/A 7.943 N/A 3/32 N/A 7 3/4 N/A 7 15/16 N/A 2.6 N/A 196.5 N/A 201.8
1-171 N/A 0.103 N/A 0.003 N/A 7.987 N/A 0.045 N/A 8.193 N/A 3/32 N/A 8 N/A 8 3/16 N/A 2.6 N/A 202.9 N/A 208.1
1-172 N/A 0.103 N/A 0.003 N/A 8.237 N/A 0.050 N/A 8.443 N/A 3/32 N/A 8 1/4 N/A 8 7/16 N/A 2.6 N/A 209.2 N/A 214.5
1-173 N/A 0.103 N/A 0.003 N/A 8.487 N/A 0.050 N/A 8.693 N/A 3/32 N/A 8 1/2 N/A 8 11/16 N/A 2.6 N/A 215.6 N/A 220.8
1-174 N/A 0.103 N/A 0.003 N/A 8.737 N/A 0.050 N/A 8.943 N/A 3/32 N/A 8 3/4 N/A 8 15/16 N/A 2.6 N/A 221.9 N/A 227.2
1-175 N/A 0.103 N/A 0.003 N/A 8.987 N/A 0.050 N/A 9.193 N/A 3/32 N/A 9 N/A 9 3/16 N/A 2.6 N/A 228.3 N/A 233.5
1-176 N/A 0.103 N/A 0.003 N/A 9.237 N/A 0.055 N/A 9.443 N/A 3/32 N/A 9 1/4 N/A 9 7/16 N/A 2.6 N/A 234.6 N/A 239.9
1-177 N/A 0.103 N/A 0.003 N/A 9.487 N/A 0.055 N/A 9.693 N/A 3/32 N/A 9 1/2 N/A 9 11/16 N/A 2.6 N/A 241.0 N/A 246.2
1-178 N/A 0.103 N/A 0.003 N/A 9.737 N/A 0.055 N/A 9.943 N/A 3/32 N/A 9 3/4 N/A 9 15/16 N/A 2.6 N/A 247.3 N/A 252.6
1-179 N/A 0.103 N/A 0.003 N/A 9.987 N/A 0.055 N/A 10.193 N/A 3/32 N/A 10 N/A 10 3/16 N/A 2.6 N/A 253.7 N/A 258.9
1-201 N/A 0.139 N/A 0.004 N/A 0.171 N/A 0.005 N/A 0.449 N/A 1/8 N/A 3/16 N/A 7/16 N/A 3.5 N/A 4.3 N/A 11.4
1-202 N/A 0.139 N/A 0.004 N/A 0.234 N/A 0.005 N/A 0.512 N/A 1/8 N/A 1/4 N/A 1/2 N/A 3.5 N/A 5.9 N/A 13.0
1-203 N/A 0.139 N/A 0.004 N/A .296 N/A 0.005 N/A 0.579 N/A 1/8 N/A 5/16 N/A 9/16 N/A 3.5 N/A 7.6 N/A 14.7
1-204 N/A 0.139 N/A 0.004 N/A 0.359 N/A 0.005 N/A 0.637 N/A 1/8 N/A 3/8 N/A 5/8 N/A 3.5 N/A 9.1 N/A 16.2
1-205 N/A 0.139 N/A 0.004 N/A 0.421 N/A 0.005 N/A 0.699 N/A 1/8 N/A 7/16 N/A 11/16 N/A 3.5 N/A 10.7 N/A 17.8
1-206 N/A 0.139 N/A 0.004 N/A 0.484 N/A 0.005 N/A 0.762 N/A 1/8 N/A 1/2 N/A 3/4 N/A 3.5 N/A 12.3 N/A 19.4
1-207 N/A 0.139 N/A 0.004 N/A 0.549 N/A 0.007 N/A 0.827 N/A 1/8 N/A 9/16 N/A 13/16 N/A 3.5 N/A 13.9 N/A 21.0
1-208 N/A 0.139 N/A 0.004 N/A 0.609 N/A 0.009 N/A 0.887 N/A 1/8 N/A 5/8 N/A 7/8 N/A 3.5 N/A 15.5 N/A 22.5
1-209 N/A 0.139 N/A 0.004 N/A 0.672 N/A 0.009 N/A 0.950 N/A 1/8 N/A 11/16 N/A 15/16 N/A 3.5 N/A 17.1 N/A 24.1
1-210 N/A 0.139 N/A 0.004 N/A 0.734 N/A 0.010 N/A 1.012 N/A 1/8 N/A 3/4 N/A 1 N/A 3.5 N/A 18.6 N/A 25.7
Unit of Measure
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