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)

76-1.580 N/A 0.076 N/A 0.003 N/A 1.580 N/A 0.015 N/A 1.732 N/A 1.9 N/A 4.1 N/A 44
77-240 N/A 0.077 N/A 0.003 N/A 0.240 N/A 0.005 N/A 0.394 N/A 2.0 N/A 6.1 N/A 10.0
77-614 N/A 0.077 N/A 0.003 N/A 0.614 N/A 0.009 N/A 0.768 N/A 2.0 N/A 15.6 N/A 19.5
77-250SS N/A 0.078 N/A 0.003 N/A 0.255 N/A 0.005 N/A 0.411 N/A 2.0 N/A 6.5 N/A 1.4
78-312 N/A 0.078 N/A 0.003 N/A 0.312 N/A 0.005 N/A 0.468 N/A 2.0 N/A 7.9 N/A 11.9
78-1.102 N/A 0.078 N/A 0.003 N/A 1.102 N/A 0.010 N/A 1.258 N/A 2.0 N/A 28 N/A 32.0
78-1.234 N/A 0.078 N/A 0.003 N/A 1.234 N/A 0.012 N/A 1.390 N/A 2.0 N/A 31.3 N/A 35.3
77-1.362VS N/A 0.078 N/A 0.003 N/A 1.387 N/A 0.012 N/A 1.543 N/A 2.0 N/A 35.2 N/A 39.2
78-1.417 N/A 0.078 N/A 0.003 N/A 1.417 N/A 0.012 N/A 1.573 N/A 2.0 N/A 36 N/A 40.0
78-1.609 N/A 0.078 N/A 0.003 N/A 1.609 N/A 0.015 N/A 1.765 N/A 2.0 N/A 4.9 N/A 44.8
78-2.919 N/A 0.078 N/A 0.003 N/A 2.919 N/A 0.022 N/A 3.075 N/A 2.0 N/A 74.1 N/A 78.1
79-224 N/A 0.079 N/A 0.003 N/A 0.224 N/A 0.005 N/A 0.382 N/A 2.0 N/A 5.7 N/A 9.7
77-468SS N/A 0.079 N/A 0.003 N/A 0.478 N/A 0.005 N/A 0.636 N/A 2.0 N/A 12.1 N/A 16.2
79-551 N/A 0.079 N/A 0.003 N/A 0.551 N/A 0.007 N/A 0.709 N/A 2.0 N/A 14.0 N/A 18
79-591NS N/A 0.079 N/A 0.003 N/A 0.589 N/A 0.007 N/A 0.747 N/A 2.0 N/A 15 N/A 19.0
79-866ES N/A 0.079 N/A 0.003 N/A 0.870 N/A 0.010 N/A 1.028 N/A 2.0 N/A 22.1 N/A 26.1
79-945 N/A 0.079 N/A 0.003 N/A 0.945 N/A 0.010 N/A 1.103 N/A 2.0 N/A 24 N/A 28
79-1.063 N/A 0.079 N/A 0.003 N/A 1.063 N/A 0.010 N/A 1.221 N/A 2.0 N/A 27.0 N/A 31.0
79-1.772 N/A 0.079 N/A 0.003 N/A 1.772 N/A 0.015 N/A 1.930 N/A 2.0 N/A 45 N/A 49
79-1.850 N/A 0.079 N/A 0.003 N/A 1.850 N/A 0.015 N/A 2.008 N/A 2.0 N/A 47.0 N/A 51
79-2.135ES N/A 0.079 N/A 0.003 N/A 2.140 N/A 0.017 N/A 2.298 N/A 2.0 N/A 54.4 N/A 58.4
79-2.943ES N/A 0.079 N/A 0.003 N/A 2.950 N/A 0.022 N/A 3.108 N/A 2.0 N/A 74.9 N/A 78.9
80-54 N/A 0.080 N/A 0.003 N/A 0.054 N/A 0.005 N/A 0.214 N/A 2.0 N/A 1.4 N/A 5.4
80-120 N/A 0.080 N/A 0.003 N/A 0.120 N/A 0.005 N/A 0.280 N/A 2.0 N/A 3.0 N/A 7.1
80-145 N/A 0.080 N/A 0.003 N/A 0.145 N/A 0.005 N/A 0.305 N/A 2.0 N/A 3.7 N/A 7.7
Unit of Measure
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