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)

1-451	N/A 0.275	N/A 0.006	N/A 10.975	N/A 0.060	N/A 11.525	N/A 1/4	N/A 11	N/A 11 1/2	N/A 7.0	N/A 278.8	N/A 292.7
1-450	N/A 0.275	N/A 0.006	N/A 10.475	N/A 0.060	N/A 11.025	N/A 1/4	N/A 10 1/2	N/A 11	N/A 7.0	N/A 266.1	N/A 280.0
1-449	N/A 0.275	N/A 0.006	N/A 9.975	N/A 0.055	N/A 10.525	N/A 1/4	N/A 10	N/A 10 1/2	N/A 7.0	N/A 253.4	N/A 267.3
1-448	N/A 0.275	N/A 0.006	N/A 9.475	N/A 0.055	N/A 10.025	N/A 1/4	N/A 9 1/2	N/A 10	N/A 7.0	N/A 240.7	N/A 254.6
1-447	N/A 0.275	N/A 0.006	N/A 8.975	N/A 0.055	N/A 9.525	N/A 1/4	N/A 9	N/A 9 1/2	N/A 7.0	N/A 228.0	N/A 241.9
1-446	N/A 0.275	N/A 0.006	N/A 8.475	N/A 0.055	N/A 9.025	N/A 1/4	N/A 8 1/2	N/A 9	N/A 7.0	N/A 215.3	N/A 229.2
1-445	N/A 0.275	N/A 0.006	N/A 7.975	N/A 0.045	N/A 8.525	N/A 1/4	N/A 8	N/A 8 1/2	N/A 7.0	N/A 202.6	N/A 216.5
1-444	N/A 0.275	N/A 0.006	N/A 7.725	N/A 0.045	N/A 8.275	N/A 1/4	N/A 7 3/4	N/A 8 1/4	N/A 7.0	N/A 196.2	N/A 210.2
1-443	N/A 0.275	N/A 0.006	N/A 7.475	N/A 0.045	N/A 8.025	N/A 1/4	N/A 7 1/2	N/A 8	N/A 7.0	N/A 189.9	N/A 203.8
1-442	N/A 0.275	N/A 0.006	N/A 7.225	N/A 0.045	N/A 7.775	N/A 1/4	N/A 7 1/4	N/A 7 3/4	N/A 7.0	N/A 183.5	N/A 197.5
1-441	N/A 0.275	N/A 0.006	N/A 6.975	N/A 0.040	N/A 7.525	N/A 1/4	N/A 7	N/A 7 1/2	N/A 7.0	N/A 177.2	N/A 191.1
1-440	N/A 0.275	N/A 0.006	N/A 6.725	N/A 0.040	N/A 7.275	N/A 1/4	N/A 6 3/4	N/A 7 1/4	N/A 7.0	N/A 170.8	N/A 184.8
1-439	N/A 0.275	N/A 0.006	N/A 6.475	N/A 0.040	N/A 7.025	N/A 1/4	N/A 6 1/2	N/A 7	N/A 7.0	N/A 164.5	N/A 178.4
1-438	N/A 0.275	N/A 0.006	N/A 6.225	N/A 0.040	N/A 6.775	N/A 1/4	N/A 6 1/4	N/A 6 3/4	N/A 7.0	N/A 158.1	N/A 172.1
1-437	N/A 0.275	N/A 0.006	N/A 5.975	N/A 0.037	N/A 6.525	N/A 1/4	N/A 6	N/A 6 1/2	N/A 7.0	N/A 151.8	N/A 165.7
1-436	N/A 0.275	N/A 0.006	N/A 5.850	N/A 0.037	N/A 6.400	N/A 1/4	N/A 5 7/8	N/A 6 3/8	N/A 7.0	N/A 148.6	N/A 162.6
1-435	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
1-434	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
1-433	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
1-432	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
1-431	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
1-430	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
1-429	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
1-428	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
1-427	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

26 - 50 of 448 | Results Per Page | View | Unit of Measure

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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