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)

12-145 N/A 0.012 N/A 0.003 N/A 0.145 N/A 0.005 N/A 0.169 N/A 0.3 N/A 3.7 N/A 4.3
16-47 N/A 0.016 N/A 0.003 N/A 0.047 N/A 0.004 N/A 0.079 N/A 0.4 N/A 1.2 N/A 2
16-171 N/A 0.016 N/A 0.003 N/A 0.171 N/A 0.005 N/A 0.203 N/A 0.4 N/A 4.3 N/A 5.2
16-175 N/A 0.016 N/A 0.003 N/A 0.175 N/A 0.005 N/A 0.207 N/A 0.4 N/A 4.4 N/A 5.3
16-438 N/A 0.016 N/A 0.003 N/A 0.438 N/A 0.005 N/A 0.470 N/A 0.4 N/A 11.1 N/A 11.9
17-30 N/A 0.017 N/A 0.003 N/A 0.030 N/A 0.004 N/A 0.064 N/A 0.4 N/A 0.8 N/A 1.6
17-44 N/A 0.017 N/A 0.003 N/A 0.044 N/A 0.004 N/A 0.078 N/A 0.4 N/A 1.1 N/A 2
17-65 N/A 0.017 N/A 0.003 N/A 0.065 N/A 0.004 N/A 0.099 N/A 0.4 N/A 1.7 N/A 2.5
17-2.400 N/A 0.017 N/A 0.003 N/A 2.400 N/A 0.018 N/A 2.434 N/A 0.4 N/A 61 N/A 61.8
18-81ES N/A 0.018 N/A 0.003 N/A 0.082 N/A 0.005 N/A 0.118 N/A 0.5 N/A 2.1 N/A 3
19-38 N/A 0.019 N/A 0.003 N/A 0.038 N/A 0.004 N/A 0.076 N/A 0.5 N/A 1.0 N/A 1.9
20-17 N/A 0.020 N/A 0.003 N/A 0.017 N/A 0.004 N/A 0.057 N/A 0.5 N/A 0.4 N/A 1.4
20-30 N/A 0.020 N/A 0.003 N/A 0.030 N/A 0.004 N/A 0.070 N/A 0.5 N/A 0.8 N/A 1.8
20-45 N/A 0.020 N/A 0.003 N/A 0.045 N/A 0.004 N/A 0.085 N/A 0.5 N/A 1.1 N/A 2.2
20-87 N/A 0.020 N/A 0.003 N/A 0.087 N/A 0.005 N/A 0.127 N/A 0.5 N/A 2.2 N/A 3.2
20-90 N/A 0.020 N/A 0.003 N/A 0.090 N/A 0.005 N/A 0.130 N/A 0.5 N/A 2.3 N/A 3.3
20-150 N/A 0.020 N/A 0.003 N/A 0.150 N/A 0.005 N/A 0.190 N/A 0.5 N/A 3.8 N/A 4.8
20-170 N/A 0.020 N/A 0.003 N/A 0.170 N/A 0.005 N/A 0.210 N/A 0.5 N/A 4.3 N/A 5.3
20-170VS N/A 0.020 N/A 0.003 N/A 0.172 N/A 0.005 N/A 0.212 N/A 0.5 N/A 4.4 N/A 5.4
20-248 N/A 0.020 N/A 0.003 N/A 0.248 N/A 0.005 N/A 0.288 N/A 0.5 N/A 6.3 N/A 7.3
20-305 N/A 0.020 N/A 0.003 N/A 0.305 N/A 0.005 N/A 0.345 N/A 0.5 N/A 7.7 N/A 8.8
20-515 N/A 0.020 N/A 0.003 N/A 0.515 N/A 0.005 N/A 0.555 N/A 0.5 N/A 13.1 N/A 14.1
20-583ES N/A 0.020 N/A 0.003 N/A 0.587 N/A 0.007 N/A 0.627 N/A 0.5 N/A 14.9 N/A 15.9
20-595 N/A 0.020 N/A 0.003 N/A 0.595 N/A 0.007 N/A 0.635 N/A 0.5 N/A 15.1 N/A 16.1
21-74 N/A 0.021 N/A 0.003 N/A 0.074 N/A 0.005 N/A 0.116 N/A 0.5 N/A 1.9 N/A 2.9
Unit of Measure
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