AS568 O-ring Size Chart [PDF Download]

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AS568 is a widely used international standard for O-ring sizes, originally established by the Society of Automotive Engineers (SAE). This standard covers a full range of O-ring sizes, clearly defining the inner diameter, outer diameter, basic tolerance, groove dimensions, and chamfer dimensions for each cross-sectional thickness (wire diameter).

AS568 O-rings are used worldwide in all kinds of equipment, for both moving and fixed sealing applications. Some AS568 sizes are also identical to the AN6227 and AN6230 standards, so they can be used interchangeably.

AS568 O-ring Size Chart [PDF Download]

Simple AS568 O-rings Size Chart

  • CS: Cross-section diameter (Wire diameter)
  • ID: Inner diameter
  • OD: Outer diameter

AS568 No.
Range

CS Range
(mm)

ID Range
(mm)

OD Range
(mm)

CS Range
(inch)

ID Range
(inch)

OD Range
(inch)

AS568-001

1.02

0.74

2.78

0.040

0.029

0.109

AS568-002

1.27

1.07

3.61

0.050

0.042

0.142

AS568-003

1.52

1.42

4.46

0.060

0.056

0.176

AS568-004~050

1.78

1.78 ~ 133.07

5.34 ~ 136.63

0.070

0.070 ~ 5.239

0.210 ~ 5.379

AS568-102~178

2.62

1.24 ~ 247.32

6.48 ~ 252.56

0.103

0.049 ~ 9.737

0.255 ~ 9.943

AS568-201~284

3.53

4.34 ~ 456.06

11.40 ~ 463.12

0.139

0.171 ~ 17.955

0.449 ~ 18.233

AS568-309~395

5.33

10.46 ~ 658.88

21.12 ~ 669.54

0.210

0.412 ~ 25.940

0.831 ~ 26.360

AS568-425~475

6.98

113.66 ~ 658.88

127.62 ~ 672.84

0.275

4.475 ~ 25.940

5.024 ~ 26.490

AS568-901

1.42

4.70

7.54

0.056

0.185

0.297

AS568-902~903

1.63

6.07 ~ 7.64

9.33 ~ 10.90

0.064

0.239 ~ 0.301

0.367 ~ 0.429

AS568-904~905

1.83

8.92 ~ 10.52

12.58 ~ 14.18

0.072

0.351 ~ 0.414

0.495 ~ 0.558

AS568-906

1.98

11.89

15.85

0.078

0.468

0.624

AS568-907

2.08

13.46

17.62

0.082

0.530

0.694

AS568-908

2.21

16.36

20.78

0.087

0.644

0.818

AS568-909~910

2.46

17.93 ~ 19.18

22.85 ~ 24.10

0.097

0.706 ~ 0.755

0.900 ~ 0.949

AS568-911~918

2.95

21.92 ~ 34.42

27.82 ~ 40.32

0.116

0.863 ~ 1.355

1.095 ~ 1.587

AS568-920~932

3.00

37.46 ~ 59.36

43.46 ~ 65.36

0.118

1.475 ~ 2.337

1.711 ~ 2.573