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)

1-476	N/A 0.275	N/A 0.006	N/A 26.955	N/A 0.120	N/A 27.505	N/A 1/4	N/A 27	N/A 27 1/2	N/A 7.0	N/A 684.7	N/A 698.6
1-396	N/A 0.210	N/A 0.005	N/A 26.940	N/A 0.120	N/A 27.360	N/A 3/16	N/A 27	N/A 27 3/8	N/A 5.3	N/A 684.3	N/A 695.0
1-475	N/A 0.275	N/A 0.006	N/A 25.940	N/A 0.120	N/A 26.490	N/A 1/4	N/A 26	N/A 26 1/2	N/A 7.0	N/A 658.9	N/A 672.8
1-395	N/A 0.210	N/A 0.005	N/A 25.940	N/A 0.120	N/A 26.360	N/A 3/16	N/A 26	N/A 26 3/8	N/A 5.3	N/A 658.9	N/A 669.5
1-474	N/A 0.275	N/A 0.006	N/A 24.940	N/A 0.115	N/A 25.490	N/A 1/4	N/A 25	N/A 25 1/2	N/A 7.0	N/A 633.5	N/A 647.4
1-394	N/A 0.210	N/A 0.005	N/A 24.940	N/A 0.115	N/A 25.360	N/A 3/16	N/A 25	N/A 25 3/8	N/A 5.3	N/A 633.5	N/A 644.1
1-473	N/A 0.275	N/A 0.006	N/A 23.940	N/A 0.110	N/A 24.490	N/A 1/4	N/A 24	N/A 24 1/2	N/A 7.0	N/A 608.1	N/A 622.0
1-393	N/A 0.210	N/A 0.005	N/A 23.940	N/A 0.110	N/A 24.360	N/A 3/16	N/A 24	N/A 24 3/8	N/A 5.3	N/A 608.1	N/A 618.7
1-472	N/A 0.275	N/A 0.006	N/A 22.940	N/A 0.105	N/A 23.490	N/A 1/4	N/A 23	N/A 23 1/2	N/A 7.0	N/A 582.7	N/A 596.6
1-392	N/A 0.210	N/A 0.005	N/A 22.940	N/A 0.105	N/A 23.360	N/A 3/16	N/A 23	N/A 23 3/8	N/A 5.3	N/A 582.7	N/A 593.3
1-471	N/A 0.275	N/A 0.006	N/A 21.955	N/A 0.100	N/A 22.505	N/A 1/4	N/A 22	N/A 22 1/2	N/A 7.0	N/A 557.7	N/A 571.6
1-391	N/A 0.210	N/A 0.005	N/A 21.955	N/A 0.095	N/A 22.415	N/A 3/16	N/A 22	N/A 22 3/8	N/A 5.3	N/A 557.7	N/A 569.3
1-470	N/A 0.275	N/A 0.006	N/A 20.955	N/A 0.095	N/A 21.505	N/A 1/4	N/A 21	N/A 21 1/2	N/A 7.0	N/A 532.3	N/A 546.2
1-390	N/A 0.210	N/A 0.005	N/A 20.955	N/A 0.095	N/A 21.375	N/A 3/16	N/A 21	N/A 21 3/8	N/A 5.3	N/A 532.3	N/A 542.9
1-286	N/A 0.139	N/A 0.004	N/A 19.960	N/A 0.090	N/A 20.238	N/A 1/8	N/A 20	N/A 20 1/4	N/A 3.5	N/A 507.0	N/A 514.0
1-469	N/A 0.275	N/A 0.006	N/A 19.955	N/A 0.095	N/A 20.505	N/A 1/4	N/A 20	N/A 20 1/2	N/A 7.0	N/A 506.9	N/A 520.8
1-389	N/A 0.210	N/A 0.005	N/A 19.955	N/A 0.095	N/A 20.375	N/A 3/16	N/A 20	N/A 20 3/8	N/A 5.3	N/A 506.9	N/A 517.5
1-468	N/A 0.275	N/A 0.006	N/A 19.455	N/A 0.090	N/A 20.005	N/A 1/4	N/A 19 1/2	N/A 20	N/A 7.0	N/A 494.2	N/A 508.1
1-467	N/A 0.275	N/A 0.006	N/A 18.955	N/A 0.090	N/A 19.505	N/A 1/4	N/A 19	N/A 19 1/2	N/A 7.0	N/A 481.5	N/A 495.4
1-388	N/A 0.210	N/A 0.005	N/A 18.955	N/A 0.090	N/A 19.375	N/A 3/16	N/A 19	N/A 19 3/8	N/A 5.3	N/A 481.5	N/A 492.1
1-466	N/A 0.275	N/A 0.006	N/A 18.455	N/A 0.085	N/A 19.005	N/A 1/4	N/A 18 1/2	N/A 19	N/A 7.0	N/A 468.8	N/A 482.7
1-465	N/A 0.275	N/A 0.006	N/A 17.955	N/A 0.085	N/A 18.505	N/A 1/4	N/A 18	N/A 18 1/2	N/A 7.0	N/A 456.1	N/A 470.0
1-387	N/A 0.210	N/A 0.005	N/A 17.955	N/A 0.085	N/A 18.375	N/A 3/16	N/A 18	N/A 18 3/8	N/A 5.3	N/A 456.1	N/A 466.7
1-284	N/A 0.139	N/A 0.004	N/A 17.955	N/A 0.085	N/A 18.233	N/A 1/8	N/A 18	N/A 18 1/4	N/A 3.5	N/A 456.1	N/A 463.1
1-464	N/A 0.275	N/A 0.006	N/A 17.455	N/A 0.085	N/A 18.005	N/A 1/4	N/A 17 1/2	N/A 18	N/A 7.0	N/A 443.4	N/A 457.3

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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