Precision Associates, Inc.
Precision Associates, Inc.
3800 North Washington Ave.
Minneapolis, MN 55412-2142
Toll Free: 1-800-394-6590
Local: +1 612-333-7464
Sales: +1 612-334-9190
Fax: 612-342-2417
Email: [email protected]
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Search our 2,700+ Standard & Special Size O-Ring Tooling List. O-Rings are available with inside diameters (ID) as small as .004" and as large as 34". If you can't find your O-Ring size, please call - new O ring sizes are added regularly. If we are not tooled for your non-standard O-Ring, we can make a special tool in our On-Site mold shop.

Click here to view our O-Ring Brochure.
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)

Metric C/S (mm)

Metric I.D. (mm)

Metric O.D. (mm)

70-10.232SS N/A 0.071 N/A 0.003 N/A 10.328 N/A 0.055 N/A 10.470 N/A 1.8 N/A 262.3 N/A 265.9
71-10.635 N/A 0.071 N/A 0.003 N/A 10.635 N/A 0.060 N/A 10.777 N/A 1.8 N/A 27.1 N/A 273.7
70-11.240SS N/A 0.071 N/A 0.003 N/A 11.423 N/A 0.065 N/A 11.565 N/A 1.8 N/A 29.1 N/A 293.8
70-2.840SS N/A 0.071 N/A 0.003 N/A 21.077 N/A 0.095 N/A 21.219 N/A 1.8 N/A 535.4 N/A 539
70-21.270SS N/A 0.071 N/A 0.003 N/A 21.512 N/A 0.095 N/A 21.654 N/A 1.8 N/A 546.4 N/A 550
71-256VS N/A 0.072 N/A 0.003 N/A 0.259 N/A 0.005 N/A 0.403 N/A 1.8 N/A 6.6 N/A 1.2
70-518SS N/A 0.072 N/A 0.003 N/A 0.529 N/A 0.005 N/A 0.673 N/A 1.8 N/A 13.4 N/A 17.1
71-525SS N/A 0.072 N/A 0.003 N/A 0.533 N/A 0.005 N/A 0.677 N/A 1.8 N/A 13.5 N/A 17.2
70-688SS N/A 0.072 N/A 0.003 N/A 0.703 N/A 0.009 N/A 0.847 N/A 1.8 N/A 17.9 N/A 21.5
70-739SS N/A 0.072 N/A 0.003 N/A 0.760 N/A 0.009 N/A 0.904 N/A 1.8 N/A 19.3 N/A 23
70-831SS N/A 0.072 N/A 0.003 N/A 0.850 N/A 0.009 N/A 0.994 N/A 1.8 N/A 21.6 N/A 25.2
70-843SSS N/A 0.072 N/A 0.003 N/A 0.866 N/A 0.009 N/A 1.010 N/A 1.8 N/A 22.0 N/A 25.7
72-926 N/A 0.072 N/A 0.003 N/A 0.926 N/A 0.009 N/A 1.070 N/A 1.8 N/A 23.5 N/A 27.2
71-1.046SS N/A 0.072 N/A 0.003 N/A 1.065 N/A 0.010 N/A 1.209 N/A 1.8 N/A 27.1 N/A 3.7
70-1.240SS N/A 0.072 N/A 0.003 N/A 1.267 N/A 0.011 N/A 1.411 N/A 1.8 N/A 32.2 N/A 35.8
71-1.280VS N/A 0.072 N/A 0.003 N/A 1.293 N/A 0.011 N/A 1.437 N/A 1.8 N/A 32.8 N/A 36.5
71-2.638VS N/A 0.072 N/A 0.003 N/A 2.666 N/A 0.020 N/A 2.810 N/A 1.8 N/A 67.7 N/A 71.4
71-4.409VS N/A 0.072 N/A 0.003 N/A 4.455 N/A 0.030 N/A 4.599 N/A 1.8 N/A 113.2 N/A 116.8
73-40 N/A 0.073 N/A 0.003 N/A 0.040 N/A 0.004 N/A 0.186 N/A 1.9 N/A 1.0 N/A 4.7
70-145SS N/A 0.073 N/A 0.003 N/A 0.152 N/A 0.005 N/A 0.298 N/A 1.9 N/A 3.9 N/A 7.6
73-182 N/A 0.073 N/A 0.003 N/A 0.182 N/A 0.005 N/A 0.328 N/A 1.9 N/A 4.6 N/A 8.3
73-357 N/A 0.073 N/A 0.003 N/A 0.357 N/A 0.005 N/A 0.503 N/A 1.9 N/A 9.1 N/A 12.8
70-489SS N/A 0.073 N/A 0.003 N/A 0.508 N/A 0.005 N/A 0.654 N/A 1.9 N/A 12.9 N/A 16.6
73-735 N/A 0.073 N/A 0.003 N/A 0.735 N/A 0.009 N/A 0.881 N/A 1.9 N/A 18.7 N/A 22.4
73-1.639 N/A 0.073 N/A 0.003 N/A 1.639 N/A 0.013 N/A 1.785 N/A 1.9 N/A 41.6 N/A 45.3
Unit of Measure
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