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.

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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)

31-43 N/A 0.031 N/A 0.003 N/A 0.043 N/A 0.004 N/A 0.105 N/A 0.8 N/A 1.1 N/A 2.7
31-43SS N/A 0.031 N/A 0.003 N/A 0.044 N/A 0.004 N/A 0.106 N/A 0.8 N/A 1.1 N/A 2.7
31-125 N/A 0.031 N/A 0.003 N/A 0.125 N/A 0.005 N/A 0.187 N/A 0.8 N/A 3.2 N/A 4.7
31-146 N/A 0.031 N/A 0.003 N/A 0.146 N/A 0.005 N/A 0.208 N/A 0.8 N/A 3.7 N/A 5.3
31-187 N/A 0.031 N/A 0.003 N/A 0.187 N/A 0.005 N/A 0.249 N/A 0.8 N/A 4.7 N/A 6.3
31-238 N/A 0.031 N/A 0.003 N/A 0.238 N/A 0.005 N/A 0.300 N/A 0.8 N/A 6.0 N/A 7.6
31-312 N/A 0.031 N/A 0.003 N/A 0.312 N/A 0.005 N/A 0.374 N/A 0.8 N/A 7.9 N/A 9.5
31-332 N/A 0.031 N/A 0.003 N/A 0.332 N/A 0.005 N/A 0.394 N/A 0.8 N/A 8.4 N/A 10.0
31-410 N/A 0.031 N/A 0.003 N/A 0.410 N/A 0.005 N/A 0.472 N/A 0.8 N/A 1.4 N/A 12
31-435 N/A 0.031 N/A 0.003 N/A 0.435 N/A 0.005 N/A 0.497 N/A 0.8 N/A 11.0 N/A 12.6
31-526 N/A 0.031 N/A 0.003 N/A 0.526 N/A 0.005 N/A 0.588 N/A 0.8 N/A 13.4 N/A 14.9
31-643 N/A 0.031 N/A 0.003 N/A 0.643 N/A 0.009 N/A 0.705 N/A 0.8 N/A 16.3 N/A 17.9
31-779 N/A 0.031 N/A 0.003 N/A 0.779 N/A 0.009 N/A 0.841 N/A 0.8 N/A 19.8 N/A 21.4
31-898 N/A 0.031 N/A 0.003 N/A 0.898 N/A 0.009 N/A 0.960 N/A 0.8 N/A 22.8 N/A 24.4
31-915 N/A 0.031 N/A 0.003 N/A 0.915 N/A 0.009 N/A 0.977 N/A 0.8 N/A 23.2 N/A 24.8
31-1.071 N/A 0.031 N/A 0.003 N/A 1.071 N/A 0.010 N/A 1.133 N/A 0.8 N/A 27.2 N/A 28.8
31-1.226 N/A 0.031 N/A 0.003 N/A 1.226 N/A 0.011 N/A 1.288 N/A 0.8 N/A 31.1 N/A 32.7
31-1.331 N/A 0.031 N/A 0.003 N/A 1.331 N/A 0.011 N/A 1.393 N/A 0.8 N/A 33.8 N/A 35.4
31-1.491 N/A 0.031 N/A 0.003 N/A 1.491 N/A 0.013 N/A 1.553 N/A 0.8 N/A 37.9 N/A 39.4
31-1.718 N/A 0.031 N/A 0.003 N/A 1.724 N/A 0.013 N/A 1.786 N/A 0.8 N/A 43.8 N/A 45.4
32-39 N/A 0.032 N/A 0.003 N/A 0.039 N/A 0.004 N/A 0.103 N/A 0.8 N/A 1.0 N/A 2.6
32-55 N/A 0.032 N/A 0.003 N/A 0.055 N/A 0.004 N/A 0.119 N/A 0.8 N/A 1.4 N/A 3
32-62 N/A 0.032 N/A 0.003 N/A 0.062 N/A 0.004 N/A 0.126 N/A 0.8 N/A 1.6 N/A 3.2
32-110VS N/A 0.032 N/A 0.003 N/A 0.111 N/A 0.005 N/A 0.175 N/A 0.8 N/A 2.8 N/A 4.4
32-154 N/A 0.032 N/A 0.003 N/A 0.154 N/A 0.005 N/A 0.218 N/A 0.8 N/A 3.9 N/A 5.5
Unit of Measure
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