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)

40-57 N/A 0.040 N/A 0.003 N/A 0.057 N/A 0.004 N/A 0.137 N/A 1.0 N/A 1.4 N/A 3.5
40-59SS N/A 0.040 N/A 0.003 N/A 0.060 N/A 0.004 N/A 0.140 N/A 1.0 N/A 1.5 N/A 3.6
40-87 N/A 0.040 N/A 0.003 N/A 0.087 N/A 0.005 N/A 0.167 N/A 1.0 N/A 2.2 N/A 4.2
40-109 N/A 0.040 N/A 0.003 N/A 0.109 N/A 0.005 N/A 0.189 N/A 1.0 N/A 2.8 N/A 4.8
40-117 N/A 0.040 N/A 0.003 N/A 0.117 N/A 0.005 N/A 0.197 N/A 1.0 N/A 3.0 N/A 5.0
40-126SS N/A 0.040 N/A 0.003 N/A 0.127 N/A 0.005 N/A 0.207 N/A 1.0 N/A 3.2 N/A 5.3
40-136 N/A 0.040 N/A 0.003 N/A 0.136 N/A 0.005 N/A 0.216 N/A 1.0 N/A 3.5 N/A 5.5
40-147 N/A 0.040 N/A 0.003 N/A 0.147 N/A 0.005 N/A 0.227 N/A 1.0 N/A 3.7 N/A 5.8
40-176 N/A 0.040 N/A 0.003 N/A 0.176 N/A 0.005 N/A 0.256 N/A 1.0 N/A 4.5 N/A 6.5
40-180 N/A 0.040 N/A 0.003 N/A 0.180 N/A 0.005 N/A 0.260 N/A 1.0 N/A 4.6 N/A 6.6
40-184SS N/A 0.040 N/A 0.003 N/A 0.186 N/A 0.005 N/A 0.266 N/A 1.0 N/A 4.7 N/A 6.8
40-200 N/A 0.040 N/A 0.003 N/A 0.200 N/A 0.005 N/A 0.280 N/A 1.0 N/A 5.1 N/A 7.1
40-210 N/A 0.040 N/A 0.003 N/A 0.210 N/A 0.005 N/A 0.290 N/A 1.0 N/A 5.3 N/A 7.4
40-228 N/A 0.040 N/A 0.003 N/A 0.228 N/A 0.005 N/A 0.308 N/A 1.0 N/A 5.8 N/A 7.8
40-238 N/A 0.040 N/A 0.003 N/A 0.238 N/A 0.005 N/A 0.318 N/A 1.0 N/A 6.0 N/A 8.1
40-239 N/A 0.040 N/A 0.003 N/A 0.239 N/A 0.005 N/A 0.319 N/A 1.0 N/A 6.1 N/A 8.1
40-258 N/A 0.040 N/A 0.003 N/A 0.258 N/A 0.005 N/A 0.338 N/A 1.0 N/A 6.6 N/A 8.6
40-370 N/A 0.040 N/A 0.003 N/A 0.370 N/A 0.005 N/A 0.450 N/A 1.0 N/A 9.4 N/A 11.4
40-395 N/A 0.040 N/A 0.003 N/A 0.395 N/A 0.005 N/A 0.475 N/A 1.0 N/A 10.0 N/A 12.1
40-426 N/A 0.040 N/A 0.003 N/A 0.426 N/A 0.005 N/A 0.506 N/A 1.0 N/A 1.8 N/A 12.9
40-440 N/A 0.040 N/A 0.003 N/A 0.440 N/A 0.005 N/A 0.520 N/A 1.0 N/A 11.2 N/A 13.2
40-445SS N/A 0.040 N/A 0.003 N/A 0.449 N/A 0.005 N/A 0.529 N/A 1.0 N/A 11.4 N/A 13.4
40-459 N/A 0.040 N/A 0.003 N/A 0.459 N/A 0.005 N/A 0.539 N/A 1.0 N/A 11.7 N/A 13.7
40-484 N/A 0.040 N/A 0.003 N/A 0.484 N/A 0.005 N/A 0.564 N/A 1.0 N/A 12.3 N/A 14.3
40-550 N/A 0.040 N/A 0.003 N/A 0.550 N/A 0.005 N/A 0.630 N/A 1.0 N/A 14.0 N/A 16.0
Unit of Measure
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