AS 568 O-Rings from PAI

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.

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Nominal C/S (inches)

Nominal I.D. (inches)

Nominal O.D. (inches)

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)

1-401	N/A 0.275	N/A 0.006	N/A 1.475	N/A 0.015	N/A 2.025	N/A 1/4	N/A 1 1/2	N/A 2	N/A 7.0	N/A 37.5	N/A 51.4
1-400	N/A 0.275	N/A 0.006	N/A 1.350	N/A 0.012	N/A 1.900	N/A 1/4	N/A 1 3/8	N/A 1 7/8	N/A 7.0	N/A 34.3	N/A 48.3
1-572	N/A 0.176	N/A 0.005	N/A 4.850	N/A 0.030	N/A 5.202	N/A 5/32	N/A 4 7/8	N/A 5 3/16	N/A 4.5	N/A 123.2	N/A 132.1
1-571	N/A 0.176	N/A 0.005	N/A 4.725	N/A 0.030	N/A 5.077	N/A 5/32	N/A 4 3/4	N/A 5 1/16	N/A 4.5	N/A 120.0	N/A 129.0
1-569	N/A 0.176	N/A 0.005	N/A 4.600	N/A 0.030	N/A 4.952	N/A 5/32	N/A 4 5/8	N/A 4 15/16	N/A 4.5	N/A 116.8	N/A 125.8
1-568	N/A 0.176	N/A 0.005	N/A 4.475	N/A 0.030	N/A 4.827	N/A 5/32	N/A 4.5	N/A 4 13/16	N/A 4.5	N/A 113.7	N/A 122.6
1-566	N/A 0.176	N/A 0.005	N/A 4.350	N/A 0.030	N/A 4.702	N/A 5/32	N/A 4 3/8	N/A 4 11/16	N/A 4.5	N/A 110.5	N/A 119.4
1-565	N/A 0.176	N/A 0.005	N/A 4.225	N/A 0.030	N/A 4.577	N/A 5/32	N/A 4 1/4	N/A 4 9/16	N/A 4.5	N/A 107.3	N/A 116.3
1-563	N/A 0.176	N/A 0.005	N/A 4.100	N/A 0.028	N/A 4.452	N/A 5/32	N/A 4 1/8	N/A 4 7/16	N/A 4.5	N/A 104.1	N/A 113.1
1-562	N/A 0.176	N/A 0.005	N/A 3.975	N/A 0.028	N/A 4.327	N/A 5/32	N/A 4	N/A 4 5/16	N/A 4.5	N/A 101.0	N/A 109.9
1-560	N/A 0.176	N/A 0.005	N/A 3.850	N/A 0.028	N/A 4.202	N/A 5/32	N/A 3 7/8	N/A 4 3/16	N/A 4.5	N/A 97.8	N/A 106.7
1-558	N/A 0.176	N/A 0.005	N/A 3.725	N/A 0.028	N/A 4.077	N/A 5/32	N/A 3 3/4	N/A 4 1/16	N/A 4.5	N/A 94.6	N/A 103.6
1-556	N/A 0.176	N/A 0.005	N/A 3.600	N/A 0.028	N/A 3.952	N/A 5/32	N/A 3 5/8	N/A 3 15/16	N/A 4.5	N/A 91.4	N/A 100.4
1-554	N/A 0.176	N/A 0.005	N/A 3.475	N/A 0.024	N/A 3.827	N/A 5/32	N/A 3 1/2	N/A 3 13/16	N/A 4.5	N/A 88.3	N/A 97.2
1-552	N/A 0.176	N/A 0.005	N/A 3.350	N/A 0.024	N/A 3.702	N/A 5/32	N/A 3 3/8	N/A 3 11/16	N/A 4.5	N/A 85.1	N/A 94.0
1-550	N/A 0.176	N/A 0.005	N/A 3.225	N/A 0.024	N/A 3.577	N/A 5/32	N/A 3 1/4	N/A 3 9/16	N/A 4.5	N/A 81.9	N/A 90.9
1-548	N/A 0.176	N/A 0.005	N/A 3.100	N/A 0.024	N/A 3.452	N/A 5/32	N/A 3 1/8	N/A 3 7/16	N/A 4.5	N/A 78.7	N/A 87.7
1-546	N/A 0.176	N/A 0.005	N/A 2.975	N/A 0.024	N/A 3.327	N/A 5/32	N/A 3	N/A 3 5/16	N/A 4.5	N/A 75.6	N/A 84.5
1-544	N/A 0.176	N/A 0.005	N/A 2.850	N/A 0.020	N/A 3.202	N/A 5/32	N/A 2 7/8	N/A 3 3/16	N/A 4.5	N/A 72.4	N/A 81.3
1-542	N/A 0.176	N/A 0.005	N/A 2.725	N/A 0.020	N/A 3.077	N/A 5/32	N/A 2 3/4	N/A 3 1/16	N/A 4.5	N/A 69.2	N/A 78.2
1-540	N/A 0.176	N/A 0.005	N/A 2.600	N/A 0.020	N/A 2.952	N/A 5/32	N/A 2 5/8	N/A 2 15/16	N/A 4.5	N/A 66.0	N/A 75.0
1-538	N/A 0.176	N/A 0.005	N/A 2.475	N/A 0.020	N/A 2.827	N/A 5/32	N/A 2 1/2	N/A 2 13/16	N/A 4.5	N/A 62.9	N/A 71.8
1-536	N/A 0.176	N/A 0.005	N/A 2.350	N/A 0.018	N/A 2.702	N/A 5/32	N/A 2 3/8	N/A 2 11/16	N/A 4.5	N/A 59.7	N/A 68.6
1-534	N/A 0.176	N/A 0.005	N/A 2.225	N/A 0.018	N/A 2.577	N/A 5/32	N/A 2 1/4	N/A 2 9/16	N/A 4.5	N/A 56.5	N/A 65.5
1-532	N/A 0.176	N/A 0.005	N/A 2.100	N/A 0.018	N/A 2.452	N/A 5/32	N/A 2 1/8	N/A 2 7/16	N/A 4.5	N/A 53.3	N/A 62.3

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No Preference
1/32
3/64
1/16
5/64
3/32
7/64
1/8
5/32
3/16
7/32
1/4
5/16
3/8
7/16
1/2
9/16
5/8
11/16
3/4
13/16
7/8
15/16
1
1 1/16
1 1/8
1 3/16
1 1/4
1 5/16
1 3/8
1 7/16
1 1/2
1 9/16
1 5/8
1 11/16
1 3/4
1 13/16
1 7/8
1 15/16
2
2 1/16
2 1/8
2 3/16
2 1/4
2 5/16
2 3/8
2 7/16
2 1/2
2 9/16
2 5/8
2 11/16
2 3/4
2 13/16
2 7/8
3
3 1/8
3 1/4
3 3/8
3 1/2
3 5/8
3 3/4
3 7/8
4
4 1/8
4 1/4
4 3/8
4 5/8
4 3/4
4 7/8
4.5
5
5 1/8
5 1/4
5 3/8
5 1/2
5 5/8
5 3/4
5 7/8
6
6 1/4
6 1/2
6 3/4
7
7 1/4
7 1/2
7 3/4
8
8 1/4
8 1/2
8 3/4
9
9 1/4
9 1/2
9 3/4
10
10 1/2
11
11 1/2
12
12 1/2
13
13 1/2
14
14 1/2
15
15 1/2
16
16 1/2
17
17 1/2
18
18 1/2
19
19 1/2
20
21
22
23
24
25
26
27

No Preference
3/32
9/64
11/64
13/64
15/64
1/4
9/32
5/16
11/32
3/8
13/32
7/16
1/2
9/16
5/8
11/16
3/4
13/16
7/8
15/16
1
1 1/16
1 1/8
1 3/16
1 1/4
1 5/16
1 3/8
1 7/16
1 1/2
1 9/16
1 5/8
1 11/16
1 3/4
1 13/16
1 7/8
1 15/16
2
2 1/16
2 1/8
2 3/16
2 1/4
2 5/16
2 3/8
2 7/16
2 1/2
2 9/16
2 5/8
2 11/16
2 3/4
2 13/16
2 7/8
2 15/16
3
3 1/16
3 1/8
3 3/16
3 1/4
3 5/16
3 3/8
3 7/16
3 1/2
3 9/16
3 5/8
3 11/16
3 3/4
3 13/16
3 7/8
3 15/16
4
4 1/16
4 1/8
4 3/16
4 1/4
4 5/16
4 3/8
4 7/16
4 1/2
4 9/16
4 5/8
4 11/16
4 3/4
4 13/16
4 7/8
4 15/16
5
5 1/16
5 1/8
5 3/16
5 1/4
5 3/8
5 7/16
5 1/2
5 5/8
5 11/16
5 3/4
5 7/8
5 15/16
6
6 1/8
6 3/16
6 1/4
6 3/8
6 7/16
6 1/2
6 5/8
6 11/16
6 3/4
6 7/8
6 15/16
7
7 1/8
7 3/16
7 1/4
7 3/8
7 7/16
7 1/2
7 5/8
7 11/16
7 3/4
7 7/8
7 15/16
8
8 1/8
8 3/16
8 1/4
8 3/8
8 7/16
8 1/2
8 5/8
8 11/16
8 3/4
8 7/8
8 15/16
9
9 1/8
9 3/16
9 1/4
9 3/8
9 7/16
9 1/2
9 5/8
9 11/16
9 3/4
9 7/8
9 15/16
10
10 1/8
10 3/16
10 1/4
10 3/8
10 1/2
10 3/4
10 7/8
11
11 1/4
11 3/8
11 1/2
11 3/4
11 7/8
12
12 1/4
12 3/8
12 1/2
13
13 1/4
13 3/8
13 1/2
14
14 1/4
14 3/8
14 1/2
15
15 1/4
15 3/8
15 1/2
16
16 1/4
16 3/8
16 1/2
17
17 1/4
17 3/8
17 1/2
18
18 1/4
18 3/8
18 1/2
19
19 3/8
19 1/2
20
20 1/4
20 3/8
20 1/2
21 3/8
21 1/2
22 3/8
22 1/2
23 3/8
23 1/2
24 3/8
24 1/2
25 3/8
25 1/2
26 3/8
26 1/2
27 3/8
27 1/2