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)

1-025	N/A 0.070	N/A 0.003	N/A 1.176	N/A 0.011	N/A 1.316	N/A 1/16	N/A 1 3/16	N/A 1 5/16	N/A 1.8	N/A 29.9	N/A 33.4
1-026	N/A 0.070	N/A 0.003	N/A 1.239	N/A 0.011	N/A 1.379	N/A 1/16	N/A 1 1/4	N/A 1 3/8	N/A 1.8	N/A 31.5	N/A 35.0
1-027	N/A 0.070	N/A 0.003	N/A 1.301	N/A 0.011	N/A 1.441	N/A 1/16	N/A 1 5/16	N/A 1 7/16	N/A 1.8	N/A 33.0	N/A 36.6
1-028	N/A 0.070	N/A 0.003	N/A 1.364	N/A 0.013	N/A 1.504	N/A 1/16	N/A 1 3/8	N/A 1 1/2	N/A 1.8	N/A 34.6	N/A 38.2
1-029	N/A 0.070	N/A 0.003	N/A 1.489	N/A 0.013	N/A 1.629	N/A 1/16	N/A 1 1/2	N/A 1 5/8	N/A 1.8	N/A 37.8	N/A 41.4
1-030	N/A 0.070	N/A 0.003	N/A 1.614	N/A 0.013	N/A 1.754	N/A 1/16	N/A 1 5/8	N/A 1 3/4	N/A 1.8	N/A 41.0	N/A 44.6
1-031	N/A 0.070	N/A 0.003	N/A 1.739	N/A 0.015	N/A 1.879	N/A 1/16	N/A 1 3/4	N/A 1 7/8	N/A 1.8	N/A 44.2	N/A 47.7
1-032	N/A 0.070	N/A 0.003	N/A 1.864	N/A 0.015	N/A 2.004	N/A 1/16	N/A 1 7/8	N/A 2	N/A 1.8	N/A 47.3	N/A 50.9
1-033	N/A 0.070	N/A 0.003	N/A 1.989	N/A 0.018	N/A 2.129	N/A 1/16	N/A 2	N/A 2 1/8	N/A 1.8	N/A 50.5	N/A 54.1
1-034	N/A 0.070	N/A 0.003	N/A 2.114	N/A 0.018	N/A 2.254	N/A 1/16	N/A 2 1/8	N/A 2 1/4	N/A 1.8	N/A 53.7	N/A 57.3
1-035	N/A 0.070	N/A 0.003	N/A 2.239	N/A 0.018	N/A 2.379	N/A 1/16	N/A 2 1/4	N/A 2 3/8	N/A 1.8	N/A 56.9	N/A 60.4
1-036	N/A 0.070	N/A 0.003	N/A 2.364	N/A 0.018	N/A 2.504	N/A 1/16	N/A 2 3/8	N/A 2 1/2	N/A 1.8	N/A 60.0	N/A 63.6
1-037	N/A 0.070	N/A 0.003	N/A 2.489	N/A 0.018	N/A 2.629	N/A 1/16	N/A 2 1/2	N/A 2 5/8	N/A 1.8	N/A 63.2	N/A 66.8
1-038	N/A 0.070	N/A 0.003	N/A 2.614	N/A 0.020	N/A 2.754	N/A 1/16	N/A 2 5/8	N/A 2 3/4	N/A 1.8	N/A 66.4	N/A 70.0
1-039	N/A 0.070	N/A 0.003	N/A 2.739	N/A 0.020	N/A 2.879	N/A 1/16	N/A 2 3/4	N/A 2 7/8	N/A 1.8	N/A 69.6	N/A 73.1
1-040	N/A 0.070	N/A 0.003	N/A 2.864	N/A 0.020	N/A 3.004	N/A 1/16	N/A 2 7/8	N/A 3	N/A 1.8	N/A 72.7	N/A 76.3
1-041	N/A 0.070	N/A 0.003	N/A 2.989	N/A 0.024	N/A 3.129	N/A 1/16	N/A 3	N/A 3 1/8	N/A 1.8	N/A 75.9	N/A 79.5
1-042	N/A 0.070	N/A 0.003	N/A 3.239	N/A 0.024	N/A 3.379	N/A 1/16	N/A 3 1/4	N/A 3 3/8	N/A 1.8	N/A 82.3	N/A 85.8
1-043	N/A 0.070	N/A 0.003	N/A 3.489	N/A 0.024	N/A 3.629	N/A 1/16	N/A 3 1/2	N/A 3 5/8	N/A 1.8	N/A 88.6	N/A 92.2
1-044	N/A 0.070	N/A 0.003	N/A 3.739	N/A 0.027	N/A 3.879	N/A 1/16	N/A 3 3/4	N/A 3 7/8	N/A 1.8	N/A 95.0	N/A 98.5
1-045	N/A 0.070	N/A 0.003	N/A 3.989	N/A 0.027	N/A 4.129	N/A 1/16	N/A 4	N/A 4 1/8	N/A 1.8	N/A 101.3	N/A 104.9
1-046	N/A 0.070	N/A 0.003	N/A 4.239	N/A 0.030	N/A 4.379	N/A 1/16	N/A 4 1/4	N/A 4 3/8	N/A 1.8	N/A 107.7	N/A 111.2
1-047	N/A 0.070	N/A 0.003	N/A 4.489	N/A 0.030	N/A 4.629	N/A 1/16	N/A 4.5	N/A 4 5/8	N/A 1.8	N/A 114.0	N/A 117.6
1-048	N/A 0.070	N/A 0.003	N/A 4.739	N/A 0.030	N/A 4.879	N/A 1/16	N/A 4 3/4	N/A 4 7/8	N/A 1.8	N/A 120.4	N/A 123.9
1-049	N/A 0.070	N/A 0.003	N/A 4.989	N/A 0.037	N/A 5.129	N/A 1/16	N/A 5	N/A 5 1/8	N/A 1.8	N/A 126.7	N/A 130.3

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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