AS568 O-Ring Size Chart

This Reference Chart covers the AS568 O-Ring Sizes published by the Society of Automotive Engineers (S.A.E.). It includes the extended sizes in the 400 Series. The chart allows you to specify the inside diameters, cross-sections, tolerances, and size identification codes (dash numbers) for O-rings.
 

Cross-section.jpg
Series
C/S Inches
C/S Fraction
C/S mm
I.D. Range
Zero
.070
1/16
1.78
.029 – 5.239″
100
.103
3/32
2.62
.049 – 9.737″
200
.139
1/8
3.53
.171 – 17.955″
300
.210
3/16
5.33
.412 – 25.940″
400
.275
¼
6.99
1.350 – 25.940″
900
varies
varies
1.42 – 3.0
.185 – 2.337″

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AS568 O-Ring Size Reference Chart

Dash Number
CS Nominal
ID Nominal
OD Nominal
CS inch
ID Inch
Tol inch
CS mm
ID mm
Tol mm
001
1/32
1/32
3/32
0.040
0.029
± .004
1.020
0.740
± .10
002
3/64
3/64
9/64
0.050
0.042
± .004
1.270
1.070
± .10
003
1/16
1/16
3/16
0.060
0.056
± .004
1.520
1.420
± .10
004
1/16
5/64
13/64
0.070
0.070
± .005
1.780
1.780
± .13
005
1/16
3/32
7/32
0.070
0.101
± .005
1.780
2.570
± .13
006
1/16
1/8
1/4
0.070
0.114
± .005
1.780
2.900
± .13
007
1/16
5/32
9/32
0.070
0.145
± .005
1.780
3.680
± .13
008
1/16
3/16
5/16
0.070
0.176
± .005
1.780
4.470
± .13
009
1/16
7/32
11/32
0.070
0.208
± .005
1.780
5.280
± .13
010
1/16
1/4
3/8
0.070
0.239
± .005
1.780
6.070
± .13
011
1/16
5/16
7/16
0.070
0.301
± .005
1.780
7.650
± .13
012
1/16
3/8
1/2
0.070
0.364
± .005
1.780
9.250
± .13
013
1/16
7/16
9/16
0.070
0.426
± .005
1.780
10.820
± .13
014
1/16
1/2
5/8
0.070
0.489
± .005
1.780
12.420
± .13
015
1/16
9/16
11/16
0.070
0.551
± .007
1.780
14.000
± .18
016
1/16
5/8
3/4
0.070
0.614
± .009
1.780
15.600
± .23
017
1/16
11/16
13/16
0.070
0.676
± .009
1.780
17.170
± .23
018
1/16
3/4
7/8
0.070
0.739
± .009
1.780
18.770
± .23
019
1/16
13/16
15/16
0.070
0.801
± .009
1.780
20.350
± .23
020
1/16
7/8
1
0.070
0.864
± .009
1.780
21.950
± .23
021
1/16
15/16
1-1/16
0.070
0.926
± .009
1.780
23.520
± .23
022
1/16
1
1-1/8
0.070
0.989
± .010
1.780
25.120
± .25
023
1/16
1-1/16
1-3/16
0.070
1.051
± .010
1.780
26.700
± .25
024
1/16
1-1/8
1-1/4
0.070
1.114
± .010
1.780
28.300
± .25
025
1/16
1-3/16
1-5/16
0.070
1.176
± .011
1.780
29.870
± .28
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