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)

38-301 N/A 0.038 N/A 0.003 N/A 0.301 N/A 0.005 N/A 0.377 N/A 1.0 N/A 7.6 N/A 9.6
38-377 N/A 0.038 N/A 0.003 N/A 0.377 N/A 0.005 N/A 0.453 N/A 1.0 N/A 9.6 N/A 11.5
38-1.980ES N/A 0.038 N/A 0.003 N/A 1.985 N/A 0.015 N/A 2.061 N/A 1.0 N/A 5.4 N/A 52.4
39-189SS N/A 0.039 N/A 0.003 N/A 0.191 N/A 0.005 N/A 0.269 N/A 1.0 N/A 4.9 N/A 6.8
39-208 N/A 0.039 N/A 0.003 N/A 0.208 N/A 0.005 N/A 0.286 N/A 1.0 N/A 5.3 N/A 7.3
39-295 N/A 0.039 N/A 0.003 N/A 0.295 N/A 0.005 N/A 0.373 N/A 1.0 N/A 7.5 N/A 9.5
39-327 N/A 0.039 N/A 0.003 N/A 0.327 N/A 0.005 N/A 0.405 N/A 1.0 N/A 8.3 N/A 1.3
39-386 N/A 0.039 N/A 0.003 N/A 0.386 N/A 0.005 N/A 0.464 N/A 1.0 N/A 9.8 N/A 11.8
39-408 N/A 0.039 N/A 0.003 N/A 0.408 N/A 0.005 N/A 0.486 N/A 1.0 N/A 10.4 N/A 12.3
39-433 N/A 0.039 N/A 0.003 N/A 0.433 N/A 0.005 N/A 0.511 N/A 1.0 N/A 11.0 N/A 13.0
39-492 N/A 0.039 N/A 0.003 N/A 0.492 N/A 0.005 N/A 0.570 N/A 1.0 N/A 12.5 N/A 14.5
39-535 N/A 0.039 N/A 0.003 N/A 0.535 N/A 0.005 N/A 0.613 N/A 1.0 N/A 13.6 N/A 15.6
39-570 N/A 0.039 N/A 0.003 N/A 0.570 N/A 0.007 N/A 0.648 N/A 1.0 N/A 14.5 N/A 16.5
39-630 N/A 0.039 N/A 0.003 N/A 0.630 N/A 0.009 N/A 0.708 N/A 1.0 N/A 16.0 N/A 18
39-1.189 N/A 0.039 N/A 0.003 N/A 1.189 N/A 0.011 N/A 1.267 N/A 1.0 N/A 30.2 N/A 32.2
39-1.290 N/A 0.039 N/A 0.003 N/A 1.290 N/A 0.011 N/A 1.368 N/A 1.0 N/A 32.8 N/A 34.7
39-1.340 N/A 0.039 N/A 0.003 N/A 1.340 N/A 0.011 N/A 1.418 N/A 1.0 N/A 34 N/A 36
39-1.437 N/A 0.039 N/A 0.003 N/A 1.437 N/A 0.013 N/A 1.515 N/A 1.0 N/A 36.5 N/A 38.5
39-1.476 N/A 0.039 N/A 0.003 N/A 1.476 N/A 0.013 N/A 1.554 N/A 1.0 N/A 37.5 N/A 39.5
39-1.732 N/A 0.039 N/A 0.003 N/A 1.732 N/A 0.013 N/A 1.810 N/A 1.0 N/A 44.0 N/A 46
39-1.772SS N/A 0.039 N/A 0.003 N/A 1.787 N/A 0.015 N/A 1.865 N/A 1.0 N/A 45.4 N/A 47.4
39-1.969 N/A 0.039 N/A 0.003 N/A 1.969 N/A 0.015 N/A 2.047 N/A 1.0 N/A 50.0 N/A 52
39-1.969SS N/A 0.039 N/A 0.003 N/A 1.977 N/A 0.015 N/A 2.055 N/A 1.0 N/A 5.2 N/A 52.2
40-17 N/A 0.040 N/A 0.003 N/A 0.017 N/A 0.004 N/A 0.097 N/A 1.0 N/A 0.4 N/A 2.5
40-23 N/A 0.040 N/A 0.003 N/A 0.023 N/A 0.004 N/A 0.103 N/A 1.0 N/A 0.6 N/A 2.6
Unit of Measure
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