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)

39-550VS N/A 0.040 N/A 0.003 N/A 0.557 N/A 0.007 N/A 0.637 N/A 1.0 N/A 14.1 N/A 16.2
40-612 N/A 0.040 N/A 0.003 N/A 0.612 N/A 0.007 N/A 0.692 N/A 1.0 N/A 15.5 N/A 17.6
40-660 N/A 0.040 N/A 0.003 N/A 0.660 N/A 0.009 N/A 0.740 N/A 1.0 N/A 16.8 N/A 18.8
40-701 N/A 0.040 N/A 0.003 N/A 0.701 N/A 0.009 N/A 0.781 N/A 1.0 N/A 17.8 N/A 19.8
40-725 N/A 0.040 N/A 0.003 N/A 0.725 N/A 0.009 N/A 0.805 N/A 1.0 N/A 18.4 N/A 2.4
40-750 N/A 0.040 N/A 0.003 N/A 0.750 N/A 0.009 N/A 0.830 N/A 1.0 N/A 19.1 N/A 21.1
40-785 N/A 0.040 N/A 0.003 N/A 0.785 N/A 0.009 N/A 0.865 N/A 1.0 N/A 19.9 N/A 22.0
40-820 N/A 0.040 N/A 0.003 N/A 0.820 N/A 0.009 N/A 0.900 N/A 1.0 N/A 2.8 N/A 22.9
40-825 N/A 0.040 N/A 0.003 N/A 0.825 N/A 0.009 N/A 0.905 N/A 1.0 N/A 21.0 N/A 23
40-879 N/A 0.040 N/A 0.003 N/A 0.879 N/A 0.009 N/A 0.959 N/A 1.0 N/A 22.3 N/A 24.4
40-929 N/A 0.040 N/A 0.003 N/A 0.929 N/A 0.009 N/A 1.009 N/A 1.0 N/A 23.6 N/A 25.6
40-930 N/A 0.040 N/A 0.003 N/A 0.930 N/A 0.009 N/A 1.010 N/A 1.0 N/A 23.6 N/A 25.7
40-950 N/A 0.040 N/A 0.003 N/A 0.950 N/A 0.009 N/A 1.030 N/A 1.0 N/A 24.1 N/A 26.2
40-1.040 N/A 0.040 N/A 0.003 N/A 1.040 N/A 0.010 N/A 1.120 N/A 1.0 N/A 26.4 N/A 28.4
40-1.062 N/A 0.040 N/A 0.003 N/A 1.062 N/A 0.010 N/A 1.142 N/A 1.0 N/A 27.0 N/A 29.0
40-1.086 N/A 0.040 N/A 0.003 N/A 1.086 N/A 0.010 N/A 1.166 N/A 1.0 N/A 27.6 N/A 29.6
40-1.105 N/A 0.040 N/A 0.003 N/A 1.105 N/A 0.010 N/A 1.185 N/A 1.0 N/A 28.1 N/A 3.1
40-1.116VS N/A 0.040 N/A 0.003 N/A 1.126 N/A 0.010 N/A 1.206 N/A 1.0 N/A 28.6 N/A 3.6
40-1.220 N/A 0.040 N/A 0.003 N/A 1.220 N/A 0.011 N/A 1.300 N/A 1.0 N/A 31 N/A 33
40-1.249VS N/A 0.040 N/A 0.003 N/A 1.261 N/A 0.011 N/A 1.341 N/A 1.0 N/A 32.0 N/A 34.1
40-1.310 N/A 0.040 N/A 0.003 N/A 1.310 N/A 0.011 N/A 1.390 N/A 1.0 N/A 33.3 N/A 35.3
40-1.828 N/A 0.040 N/A 0.003 N/A 1.828 N/A 0.015 N/A 1.908 N/A 1.0 N/A 46.4 N/A 48.5
40-1.860 N/A 0.040 N/A 0.003 N/A 1.860 N/A 0.015 N/A 1.940 N/A 1.0 N/A 47.2 N/A 49.3
40-1.958 N/A 0.040 N/A 0.003 N/A 1.958 N/A 0.015 N/A 2.038 N/A 1.0 N/A 49.7 N/A 51.8
40-2.152 N/A 0.040 N/A 0.003 N/A 2.152 N/A 0.018 N/A 2.232 N/A 1.0 N/A 54.7 N/A 56.7
Unit of Measure
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