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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Explore our AS-568 & Extended Standard Size O-Rings including our new 5/32" Nominal Cross Section O-Rings. Precision Associates' O-Rings are available off the shelf in several standard compounds. Or try O-Rings in one of 1,200+ specialty materials in 20 polymer groups, including Viton®, AFLAS®, EPDM, Nitrile, HNBR (HSN), XNBR, Neoprene®, Butyl, XNBR, Silicone, Fluorosilicone, Perfluoroelastomer, Urethane, Hypalon®, and Hydrin®.

Click here to view our 48 (5Mb) Catalog illustrated with full-size drawings of Standard Size O-Rings plus Dimensions and Tolerances.
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)

Nominal C/S (inches)

Nominal I.D. (inches)

Nominal O.D. (inches)

Metric C/S (mm)

Metric I.D. (mm)

Metric O.D. (mm)

1-236 N/A 0.139 N/A 0.004 N/A 3.234 N/A 0.024 N/A 3.512 N/A 1/8 N/A 3 1/4 N/A 3 1/2 N/A 3.5 N/A 82.1 N/A 89.2
1-237 N/A 0.139 N/A 0.004 N/A 3.359 N/A 0.024 N/A 3.637 N/A 1/8 N/A 3 3/8 N/A 3 5/8 N/A 3.5 N/A 85.3 N/A 92.4
1-238 N/A 0.139 N/A 0.004 N/A 3.484 N/A 0.024 N/A 3.762 N/A 1/8 N/A 3 1/2 N/A 3 3/4 N/A 3.5 N/A 88.5 N/A 95.6
1-239 N/A 0.139 N/A 0.004 N/A 3.609 N/A 0.028 N/A 3.887 N/A 1/8 N/A 3 5/8 N/A 3 7/8 N/A 3.5 N/A 91.7 N/A 98.7
1-240 N/A 0.139 N/A 0.004 N/A 3.734 N/A 0.028 N/A 4.012 N/A 1/8 N/A 3 3/4 N/A 4 N/A 3.5 N/A 94.8 N/A 101.9
1-241 N/A 0.139 N/A 0.004 N/A 3.859 N/A 0.028 N/A 4.137 N/A 1/8 N/A 3 7/8 N/A 4 1/8 N/A 3.5 N/A 98.0 N/A 105.1
1-242 N/A 0.139 N/A 0.004 N/A 3.984 N/A 0.028 N/A 4.262 N/A 1/8 N/A 4 N/A 4 1/4 N/A 3.5 N/A 101.2 N/A 108.3
1-243 N/A 0.139 N/A 0.004 N/A 4.109 N/A 0.028 N/A 4.387 N/A 1/8 N/A 4 1/8 N/A 4 3/8 N/A 3.5 N/A 104.4 N/A 111.4
1-244 N/A 0.139 N/A 0.004 N/A 4.234 N/A 0.030 N/A 4.512 N/A 1/8 N/A 4 1/4 N/A 4 1/2 N/A 3.5 N/A 107.5 N/A 114.6
1-245 N/A 0.139 N/A 0.004 N/A 4.359 N/A 0.030 N/A 4.637 N/A 1/8 N/A 4 3/8 N/A 4 5/8 N/A 3.5 N/A 110.7 N/A 117.8
1-246 N/A 0.139 N/A 0.004 N/A 4.484 N/A 0.030 N/A 4.762 N/A 1/8 N/A 4.5 N/A 4 3/4 N/A 3.5 N/A 113.9 N/A 121.0
1-247 N/A 0.139 N/A 0.004 N/A 4.609 N/A 0.030 N/A 4.887 N/A 1/8 N/A 4 5/8 N/A 4 7/8 N/A 3.5 N/A 117.1 N/A 124.1
1-248 N/A 0.139 N/A 0.004 N/A 4.734 N/A 0.030 N/A 5.012 N/A 1/8 N/A 4 3/4 N/A 5 N/A 3.5 N/A 120.2 N/A 127.3
1-249 N/A 0.139 N/A 0.004 N/A 4.859 N/A 0.035 N/A 5.137 N/A 1/8 N/A 4 7/8 N/A 5 1/8 N/A 3.5 N/A 123.4 N/A 130.5
1-250 N/A 0.139 N/A 0.004 N/A 4.984 N/A 0.035 N/A 5.262 N/A 1/8 N/A 5 N/A 5 1/4 N/A 3.5 N/A 126.6 N/A 133.7
1-251 N/A 0.139 N/A 0.004 N/A 5.109 N/A 0.035 N/A 5.387 N/A 1/8 N/A 5 1/8 N/A 5 3/8 N/A 3.5 N/A 129.8 N/A 136.8
1-252 N/A 0.139 N/A 0.004 N/A 5.234 N/A 0.035 N/A 5.512 N/A 1/8 N/A 5 1/4 N/A 5 1/2 N/A 3.5 N/A 132.9 N/A 140.0
1-253 N/A 0.139 N/A 0.004 N/A 5.359 N/A 0.035 N/A 5.637 N/A 1/8 N/A 5 3/8 N/A 5 5/8 N/A 3.5 N/A 136.1 N/A 143.2
1-254 N/A 0.139 N/A 0.004 N/A 5.484 N/A 0.035 N/A 5.762 N/A 1/8 N/A 5 1/2 N/A 5 3/4 N/A 3.5 N/A 139.3 N/A 146.4
1-255 N/A 0.139 N/A 0.004 N/A 5.609 N/A 0.035 N/A 5.887 N/A 1/8 N/A 5 5/8 N/A 5 7/8 N/A 3.5 N/A 142.5 N/A 149.5
1-256 N/A 0.139 N/A 0.004 N/A 5.734 N/A 0.035 N/A 6.012 N/A 1/8 N/A 5 3/4 N/A 6 N/A 3.5 N/A 145.6 N/A 152.7
1-257 N/A 0.139 N/A 0.004 N/A 5.859 N/A 0.035 N/A 6.137 N/A 1/8 N/A 5 7/8 N/A 6 1/8 N/A 3.5 N/A 148.8 N/A 155.9
1-258 N/A 0.139 N/A 0.004 N/A 5.984 N/A 0.035 N/A 6.262 N/A 1/8 N/A 6 N/A 6 1/4 N/A 3.5 N/A 152.0 N/A 159.1
1-259 N/A 0.139 N/A 0.004 N/A 6.234 N/A 0.040 N/A 6.512 N/A 1/8 N/A 6 1/4 N/A 6 1/2 N/A 3.5 N/A 158.3 N/A 165.4
1-260 N/A 0.139 N/A 0.004 N/A 6.484 N/A 0.040 N/A 6.762 N/A 1/8 N/A 6 1/2 N/A 6 3/4 N/A 3.5 N/A 164.7 N/A 171.8
Unit of Measure
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