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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®.

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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)

N/A 0.275 N/A 0.006 N/A 2.725 N/A 0.020 N/A 3.275 N/A 1/4 N/A 2 3/4 N/A 3 1/4 N/A 7.0 N/A 69.2 N/A 83.2
N/A 0.275 N/A 0.006 N/A 2.850 N/A 0.020 N/A 3.400 N/A 1/4 N/A 2 7/8 N/A 3 3/8 N/A 7.0 N/A 72.4 N/A 86.4
N/A 0.275 N/A 0.006 N/A 2.975 N/A 0.024 N/A 3.525 N/A 1/4 N/A 3 N/A 3 1/2 N/A 7.0 N/A 75.6 N/A 89.5
N/A 0.275 N/A 0.006 N/A 3.100 N/A 0.024 N/A 3.650 N/A 1/4 N/A 3 1/8 N/A 3 5/8 N/A 7.0 N/A 78.7 N/A 92.7
N/A 0.275 N/A 0.006 N/A 3.225 N/A 0.024 N/A 3.775 N/A 1/4 N/A 3 1/4 N/A 3 3/4 N/A 7.0 N/A 81.9 N/A 95.9
N/A 0.275 N/A 0.006 N/A 3.350 N/A 0.024 N/A 3.900 N/A 1/4 N/A 3 3/8 N/A 3 7/8 N/A 7.0 N/A 85.1 N/A 99.1
N/A 0.275 N/A 0.006 N/A 3.475 N/A 0.024 N/A 4.025 N/A 1/4 N/A 3 1/2 N/A 4 N/A 7.0 N/A 88.3 N/A 102.2
N/A 0.275 N/A 0.006 N/A 3.600 N/A 0.028 N/A 4.150 N/A 1/4 N/A 3 5/8 N/A 4 1/8 N/A 7.0 N/A 91.4 N/A 105.4
N/A 0.275 N/A 0.006 N/A 3.725 N/A 0.028 N/A 4.275 N/A 1/4 N/A 3 3/4 N/A 4 1/4 N/A 7.0 N/A 94.6 N/A 108.6
N/A 0.275 N/A 0.006 N/A 3.850 N/A 0.028 N/A 4.400 N/A 1/4 N/A 3 7/8 N/A 4 3/8 N/A 7.0 N/A 97.8 N/A 111.8
N/A 0.275 N/A 0.006 N/A 3.975 N/A 0.028 N/A 4.525 N/A 1/4 N/A 4 N/A 4 1/2 N/A 7.0 N/A 101.0 N/A 114.9
N/A 0.275 N/A 0.006 N/A 4.100 N/A 0.028 N/A 4.650 N/A 1/4 N/A 4 1/8 N/A 4 5/8 N/A 7.0 N/A 104.1 N/A 118.1
N/A 0.275 N/A 0.006 N/A 4.225 N/A 0.030 N/A 4.775 N/A 1/4 N/A 4 1/4 N/A 4 3/4 N/A 7.0 N/A 107.3 N/A 121.3
N/A 0.275 N/A 0.006 N/A 4.350 N/A 0.030 N/A 4.900 N/A 1/4 N/A 4 3/8 N/A 4 7/8 N/A 7.0 N/A 110.5 N/A 124.5
N/A 0.275 N/A 0.006 N/A 4.475 N/A 0.033 N/A 5.025 N/A 1/4 N/A 4.5 N/A 5 N/A 7.0 N/A 113.7 N/A 127.6
N/A 0.275 N/A 0.006 N/A 4.600 N/A 0.033 N/A 5.150 N/A 1/4 N/A 4 5/8 N/A 5 1/8 N/A 7.0 N/A 116.8 N/A 130.8
N/A 0.275 N/A 0.006 N/A 4.725 N/A 0.033 N/A 5.275 N/A 1/4 N/A 4 3/4 N/A 5 1/4 N/A 7.0 N/A 120.0 N/A 134.0
N/A 0.275 N/A 0.006 N/A 4.850 N/A 0.033 N/A 5.400 N/A 1/4 N/A 4 7/8 N/A 5 3/8 N/A 7.0 N/A 123.2 N/A 137.2
N/A 0.275 N/A 0.006 N/A 4.975 N/A 0.037 N/A 5.525 N/A 1/4 N/A 5 N/A 5 1/2 N/A 7.0 N/A 126.4 N/A 140.3
N/A 0.275 N/A 0.006 N/A 5.100 N/A 0.037 N/A 5.650 N/A 1/4 N/A 5 1/8 N/A 5 5/8 N/A 7.0 N/A 129.5 N/A 143.5
N/A 0.275 N/A 0.006 N/A 5.225 N/A 0.037 N/A 5.775 N/A 1/4 N/A 5 1/4 N/A 5 3/4 N/A 7.0 N/A 132.7 N/A 146.7
N/A 0.275 N/A 0.006 N/A 5.350 N/A 0.037 N/A 5.900 N/A 1/4 N/A 5 3/8 N/A 5 7/8 N/A 7.0 N/A 135.9 N/A 149.9
N/A 0.275 N/A 0.006 N/A 5.475 N/A 0.037 N/A 6.025 N/A 1/4 N/A 5 1/2 N/A 6 N/A 7.0 N/A 139.1 N/A 153.0
N/A 0.275 N/A 0.006 N/A 5.600 N/A 0.037 N/A 6.150 N/A 1/4 N/A 5 5/8 N/A 6 1/8 N/A 7.0 N/A 142.2 N/A 156.2
N/A 0.275 N/A 0.006 N/A 5.725 N/A 0.037 N/A 6.275 N/A 1/4 N/A 5 3/4 N/A 6 1/4 N/A 7.0 N/A 145.4 N/A 159.4
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