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)

51-547 N/A 0.051 N/A 0.003 N/A 0.547 N/A 0.005 N/A 0.649 N/A 1.3 N/A 13.9 N/A 16.5
50-720SS N/A 0.051 N/A 0.003 N/A 0.730 N/A 0.009 N/A 0.832 N/A 1.3 N/A 18.5 N/A 21.1
50-5.302VS N/A 0.051 N/A 0.003 N/A 5.365 N/A 0.037 N/A 5.467 N/A 1.3 N/A 136.3 N/A 138.9
52-229 N/A 0.052 N/A 0.003 N/A 0.229 N/A 0.005 N/A 0.333 N/A 1.3 N/A 5.8 N/A 8.5
52-306 N/A 0.052 N/A 0.003 N/A 0.306 N/A 0.005 N/A 0.410 N/A 1.3 N/A 7.8 N/A 1.4
52-364SS N/A 0.052 N/A 0.003 N/A 0.367 N/A 0.005 N/A 0.471 N/A 1.3 N/A 9.3 N/A 12
52-447 N/A 0.052 N/A 0.003 N/A 0.447 N/A 0.005 N/A 0.551 N/A 1.3 N/A 11.4 N/A 14.0
51-531ES N/A 0.052 N/A 0.003 N/A 0.537 N/A 0.005 N/A 0.641 N/A 1.3 N/A 13.6 N/A 16.3
51-547VS N/A 0.052 N/A 0.003 N/A 0.557 N/A 0.007 N/A 0.661 N/A 1.3 N/A 14.1 N/A 16.8
52-864 N/A 0.052 N/A 0.003 N/A 0.864 N/A 0.009 N/A 0.968 N/A 1.3 N/A 21.9 N/A 24.6
52-910 N/A 0.052 N/A 0.003 N/A 0.910 N/A 0.009 N/A 1.014 N/A 1.3 N/A 23.1 N/A 25.8
52-1.245 N/A 0.052 N/A 0.003 N/A 1.245 N/A 0.011 N/A 1.349 N/A 1.3 N/A 31.6 N/A 34.3
53-74 N/A 0.053 N/A 0.003 N/A 0.074 N/A 0.005 N/A 0.180 N/A 1.3 N/A 1.9 N/A 4.6
53-216 N/A 0.053 N/A 0.003 N/A 0.216 N/A 0.005 N/A 0.322 N/A 1.3 N/A 5.5 N/A 8.2
53-270 N/A 0.053 N/A 0.003 N/A 0.270 N/A 0.005 N/A 0.376 N/A 1.3 N/A 6.9 N/A 9.6
53-429SS N/A 0.053 N/A 0.003 N/A 0.433 N/A 0.005 N/A 0.539 N/A 1.3 N/A 11.0 N/A 13.7
53-458 N/A 0.053 N/A 0.003 N/A 0.458 N/A 0.005 N/A 0.564 N/A 1.3 N/A 11.6 N/A 14.3
52-1.176SS N/A 0.053 N/A 0.003 N/A 1.194 N/A 0.011 N/A 1.300 N/A 1.3 N/A 3.3 N/A 33
53-1.257 N/A 0.053 N/A 0.003 N/A 1.257 N/A 0.011 N/A 1.363 N/A 1.3 N/A 31.9 N/A 34.6
54-158 N/A 0.054 N/A 0.003 N/A 0.158 N/A 0.005 N/A 0.266 N/A 1.4 N/A 4.0 N/A 6.8
54-394 N/A 0.054 N/A 0.003 N/A 0.394 N/A 0.005 N/A 0.502 N/A 1.4 N/A 10.0 N/A 12.8
54-1.153 N/A 0.054 N/A 0.003 N/A 1.153 N/A 0.010 N/A 1.261 N/A 1.4 N/A 29.3 N/A 32.0
55-85 N/A 0.055 N/A 0.003 N/A 0.085 N/A 0.005 N/A 0.195 N/A 1.4 N/A 2.2 N/A 5.0
55-195 N/A 0.055 N/A 0.003 N/A 0.195 N/A 0.005 N/A 0.305 N/A 1.4 N/A 5.0 N/A 7.7
54-301VS N/A 0.055 N/A 0.003 N/A 0.304 N/A 0.005 N/A 0.414 N/A 1.4 N/A 7.7 N/A 1.5
Unit of Measure
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