AS568 Size Chart

/AS568 Size Chart
AS568 Size Chart 2018-06-15T10:50:42+00:00

AS568 O-Ring Size Chart

The Global O-Ring and Seal Size Reference Chart covers the AS568 O-Ring Sizes published by the Society of Automotive Engineers (S.A.E.), and includes the Extended Sizes in the 400 Series. The purpose of this chart is to specify the inside diameters, cross-sections, tolerances, and size identification codes (dash numbers) for O-rings used in sealing applications and for straight thread tube fitting boss gaskets.

Series C/S Inches C/S Frac. C/S mm ID 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 1/4 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

Use the Dash # search box below for the easiest and the quickest way to find the right information.

AS568 SIZE CHART

Dash # CS Nominal ID Nominal OD Nominal CS Inch ID Inch Tol Inch CS mm ID mm Tol mm
1 1/32 1/32 3/32 0.040 0.029 ± .004 1.020 0.740 ± .10
2 3/64 3/64 9/64 0.050 0.042 ± .004 1.270 1.070 ± .10
3 1/16 1/16 3/16 0.060 0.056 ± .004 1.520 1.420 ± .10
4 1/16 5/64 13/64 0.070 0.070 ± .005 1.780 1.780 ± .13
5 1/16 3/32 7/32 0.070 0.101 ± .005 1.780 2.570 ± .13
6 1/16 1/8 1/4 0.070 0.114 ± .005 1.780 2.900 ± .13
7 1/16 5/32 9/32 0.070 0.145 ± .005 1.780 3.680 ± .13
8 1/16 3/16 5/16 0.070 0.176 ± .005 1.780 4.470 ± .13
9 1/16 7/32 11/32 0.070 0.208 ± .005 1.780 5.280 ± .13
10 1/16 1/4 3/8 0.070 0.239 ± .005 1.780 6.070 ± .13
11 1/16 5/16 7/16 0.070 0.301 ± .005 1.780 7.650 ± .13
12 1/16 3/8 1/2 0.070 0.364 ± .005 1.780 9.250 ± .13
13 1/16 7/16 9/16 0.070 0.426 ± .005 1.780 10.820 ± .13
14 1/16 1/2 5/8 0.070 0.489 ± .005 1.780 12.420 ± .13
15 1/16 9/16 11/16 0.070 0.551 ± .007 1.780 14.000 ± .18
16 1/16 5/8 3/4 0.070 0.614 ± .009 1.780 15.600 ± .23
17 1/16 11/16 13/16 0.070 0.676 ± .009 1.780 17.170 ± .23
18 1/16 3/4 7/8 0.070 0.739 ± .009 1.780 18.770 ± .23
19 1/16 13/16 15/16 0.070 0.801 ± .009 1.780 20.350 ± .23
20 1/16 7/8 1 0.070 0.864 ± .009 1.780 21.950 ± .23
21 1/16 15/16 1-1/16 0.070 0.926 ± .009 1.780 23.520 ± .23
22 1/16 1 1-1/8 0.070 0.989 ± .010 1.780 25.120 ± .25
23 1/16 1-1/16 1-3/16 0.070 1.051 ± .010 1.780 26.700 ± .25
24 1/16 1-1/8 1-1/4 0.070 1.114 ± .010 1.780 28.300 ± .25
25 1/16 1-3/16 1-5/16 0.070 1.176 ± .011 1.780 29.870 ± .28
26 1/16 1-1/4 1-3/8 0.070 1.239 ± .011 1.780 31.470 ± .28
27 1/16 1-5/16 1-7/16 0.070 1.301 ± .011 1.780 33.050 ± .28
28 1/16 1-3/8 1-1/2 0.070 1.364 ± .013 1.780 34.650 ± .33
29 1/16 1-1/2 1-5/8 0.070 1.489 ± .013 1.780 37.820 ± .33
30 1/16 1-5/8 1-3/4 0.070 1.614 ± .013 1.780 41.000 ± .33
31 1/16 1-3/4 1-7/8 0.070 1.739 ± .015 1.780 44.170 ± .38
32 1/16 1-7/8 2 0.070 1.864 ± .015 1.780 47.350 ± .38
33 1/16 2 2-1/8 0.070 1.989 ± .018 1.780 50.520 ± .46
34 1/16 2-1/8 2-1/4 0.070 2.114 ± .018 1.780 53.700 ± .46
35 1/16 2-1/4 2-3/8 0.070 2.239 ± .018 1.780 56.870 ± .46
36 1/16 2-3/8 2-1/2 0.070 2.364 ± .018 1.780 60.050 ± .46
37 1/16 2-1/2 2-5/8 0.070 2.489 ± .018 1.780 63.220 ± .46
38 1/16 2-5/8 2-3/4 0.070 2.614 ± .020 1.780 66.400 ± .51
39 1/16 2-3/4 2-7/8 0.070 2.739 ± .020 1.780 69.570 ± .51
40 1/16 2-7/8 3 0.070 2.864 ± .020 1.780 72.750 ± .51
41 1/16 3 3-1/8 0.070 2.989 ± .024 1.780 75.920 ± .61
42 1/16 3-1/4 3-3/8 0.070 3.239 ± .024 1.780 82.270 ± .61
43 1/16 3-1/2 3-5/8 0.070 3.489 ± .024 1.780 88.620 ± .61
44 1/16 3-3/4 3-7/8 0.070 3.739 ± .027 1.780 94.970 ± .69
45 1/16 4 4-1/8 0.070 3.989 ± .027 1.780 101.320 ± .69
46 1/16 4-1/4 4-3/8 0.070 4.239 ± .030 1.780 107.670 ± .76
47 1/16 4-1/2 4-5/8 0.070 4.489 ± .030 1.780 114.020 ± .76
48 1/16 4-3/4 4-7/8 0.070 4.739 ± .030 1.780 120.370 ± .76
49 1/16 5 5-1/8 0.070 4.989 ± .037 1.780 126.720 ± .94
50 1/16 5-1/4 5-3/8 0.070 5.239 ± .037 1.780 133.070 ± .94
102 3/32 1/16 1/4 0.103 0.049 ± .005 2.620 1.240 ± .13
103 3/32 3/32 9/32 0.103 0.081 ± .005 2.620 2.060 ± .13
104 3/32 1/8 5/16 0.103 0.112 ± .005 2.620 2.840 ± .13
105 3/32 5/32 11/32 0.103 0.143 ± .005 2.620 3.630 ± .13
106 3/32 3/16 3/8 0.103 0.174 ± .005 2.620 4.420 ± .13
107 3/32 7/32 13/32 0.103 0.206 ± .005 2.620 5.230 ± .13
108 3/32 1/4 7/16 0.103 0.237 ± .005 2.620 6.020 ± .13
109 3/32 5/16 1/2 0.103 0.299 ± .005 2.620 7.590 ± .13
110 3/32 3/8 9/16 0.103 0.362 ± .005 2.620 9.190 ± .13
111 3/32 7/16 5/8 0.103 0.424 ± .005 2.620 10.770 ± .13
112 3/32 1/2 11/16 0.103 0.487 ± .005 2.620 12.370 ± .13
113 3/32 9/16 3/4 0.103 0.549 ± .007 2.620 13.940 ± .18
114 3/32 5/8 13/16 0.103 0.612 ± .009 2.620 15.540 ± .23
115 3/32 11/16 7/8 0.103 0.674 ± .009 2.620 17.120 ± .23
116 3/32 3/4 15/16 0.103 0.737 ± .009 2.620 18.720 ± .23
117 3/32 13/16 1 0.103 0.799 ± .010 2.620 20.290 ± .25
118 3/32 7/8 1-1/16 0.103 0.862 ± .010 2.620 21.890 ± .25
119 3/32 15/16 1-1/8 0.103 0.924 ± .010 2.620 23.470 ± .25
120 3/32 1 1-3/16 0.103 0.987 ± .010 2.620 25.070 ± .25
121 3/32 1-1/16 1-1/4 0.103 1.049 ± .010 2.620 26.640 ± .25
122 3/32 1-1/8 1-5/16 0.103 1.112 ± .010 2.620 28.240 ± .25
123 3/32 1-3/16 1-3/8 0.103 1.174 ± .012 2.620 29.820 ± .30
124 3/32 1-1/4 1-7/16 0.103 1.237 ± .012 2.620 31.420 ± .30
125 3/32 1-5/16 1-1/2 0.103 1.299 ± .012 2.620 32.990 ± .30
126 3/32 1-3/8 1-9/16 0.103 1.362 ± .012 2.620 34.590 ± .30
127 3/32 1-7/16 1-5/8 0.103 1.424 ± .012 2.620 36.170 ± .30
128 3/32 1-1/2 1-11/16 0.103 1.487 ± .012 2.620 37.770 ± .30
129 3/32 1-9/16 1-3/4 0.103 1.549 ± .015 2.620 39.340 ± .38
130 3/32 1-5/8 1-13/16 0.103 1.612 ± .015 2.620 40.940 ± .38
131 3/32 1-11/16 1-7/8 0.103 1.674 ± .015 2.620 42.520 ± .38
132 3/32 1-3/4 1-15/16 0.103 1.737 ± .015 2.620 44.120 ± .38
133 3/32 1-13/16 2 0.103 1.799 ± .015 2.620 45.690 ± .38
134 3/32 1-7/8 2-1/16 0.103 1.862 ± .015 2.620 47.290 ± .38
135 3/32 1-15/16 2-1/8 0.103 1.925 ± .017 2.620 48.900 ± .43
136 3/32 2 2-3/16 0.103 1.987 ± .017 2.620 50.470 ± .43
137 3/32 2-1/16 2-1/4 0.103 2.050 ± .017 2.620 52.070 ± .43
138 3/32 2-1/8 2-5/16 0.103 2.112 ± .017 2.620 53.640 ± .43
139 3/32 2-3/16 2-3/8 0.103 2.175 ± .017 2.620 55.250 ± .43
140 3/32 2-1/4 2-7/16 0.103 2.237 ± .017 2.620 56.820 ± .43
141 3/32 2-5/16 2-1/2 0.103 2.300 ± .020 2.620 58.420 ± .51
142 3/32 2-3/8 2-9/16 0.103 2.362 ± .020 2.620 59.990 ± .51
143 3/32 2-7/16 2-5/8 0.103 2.425 ± .020 2.620 61.600 ± .51
144 3/32 2-1/2 2-11/16 0.103 2.487 ± .020 2.620 63.170 ± .51
145 3/32 2-9/16 2-3/4 0.103 2.550 ± .020 2.620 64.770 ± .51
146 3/32 2-5/8 2-13/16 0.103 2.612 ± .020 2.620 66.340 ± .51
147 3/32 2-11/16 2-7/8 0.103 2.675 ± .022 2.620 67.950 ± .56
148 3/32 2-3/4 2-15/16 0.103 2.737 ± .022 2.620 69.520 ± .56
149 3/32 2-13/16 3 0.103 2.800 ± .022 2.620 71.120 ± .56
150 3/32 2-7/8 3-1/16 0.103 2.862 ± .022 2.620 72.690 ± .56
151 3/32 3 3-3/16 0.103 2.987 ± .024 2.620 75.870 ± .61
152 3/32 3-1/4 3-7/16 0.103 3.237 ± .024 2.620 82.220 ± .61
153 3/32 3-1/2 3-11/16 0.103 3.487 ± .024 2.620 88.570 ± .61
154 3/32 3-3/4 3-15/16 0.103 3.737 ± .028 2.620 94.920 ± .71
155 3/32 4 4-3/16 0.103 3.987 ± .028 2.620 101.270 ± .71
156 3/32 4-1/4 4-7/16 0.103 4.237 ± .030 2.620 107.620 ± .76
157 3/32 4-1/2 4-11/16 0.103 4.487 ± .030 2.620 113.970 ± .76
158 3/32 4-3/4 4-15/16 0.103 4.737 ± .030 2.620 120.320 ± .76
159 3/32 5 5-3/16 0.103 4.987 ± .035 2.620 126.670 ± .89
160 3/32 5-1/4 5-7/16 0.103 5.237 ± .035 2.620 133.020 ± .89
161 3/32 5-1/2 5-11/16 0.103 5.487 ± .035 2.620 139.370 ± .89
162 3/32 5-3/4 5-15/16 0.103 5.737 ± .035 2.620 145.720 ± .89
163 3/32 6 6-3/16 0.103 5.987 ± .035 2.620 152.070 ± .89
164 3/32 6-1/4 6-7/16 0.103 6.237 ± .040 2.620 158.420 ± 1.02
165 3/32 6-1/2 6-11/16 0.103 6.487 ± .040 2.620 164.770 ± 1.02
166 3/32 6-3/4 6-15/16 0.103 6.737 ± .040 2.620 171.120 ± 1.02
167 3/32 7 7-3/16 0.103 6.987 ± .040 2.620 177.470 ± 1.02
168 3/32 7-1/4 7-7/16 0.103 7.237 ± .045 2.620 183.820 ± 1.14
169 3/32 7-1/2 7-11/16 0.103 7.487 ± .045 2.620 190.170 ± 1.14
170 3/32 7-3/4 7-15/16 0.103 7.737 ± .045 2.620 196.520 ± 1.14
171 3/32 8 8-3/16 0.103 7.987 ± .045 2.620 202.870 ± 1.14
172 3/32 8-1/4 8-7/16 0.103 8.237 ± .050 2.620 209.220 ± 1.27
173 3/32 8-1/2 8-11/16 0.103 8.487 ± .050 2.620 215.570 ± 1.27
174 3/32 8-3/4 8-15/16 0.103 8.737 ± .050 2.620 221.920 ± 1.27
175 3/32 9 9-3/16 0.103 8.987 ± .050 2.620 228.270 ± 1.27
176 3/32 9-1/4 9-7/16 0.103 9.237 ± .055 2.620 234.620 ± 1.40
177 3/32 9-1/2 9-11/16 0.103 9.487 ± .055 2.620 240.970 ± 1.40
178 3/32 9-3/4 9-15/16 0.103 9.737 ± .055 2.620 247.320 ± 1.40
201 1/8 3/16 7/16 0.139 0.171 ± .005 3.530 4.340 ± .13
202 1/8 1/4 1/2 0.139 0.234 ± .005 3.530 5.940 ± .13
203 1/8 5/16 9/16 0.139 0.296 ± .005 3.530 7.520 ± .13
204 1/8 3/8 5/8 0.139 0.359 ± .005 3.530 9.120 ± .13
205 1/8 7/16 11/16 0.139 0.421 ± .005 3.530 10.690 ± .13
206 1/8 1/2 3/4 0.139 0.484 ± .005 3.530 12.290 ± .13
207 1/8 9/16 13/16 0.139 0.546 ± .007 3.530 13.870 ± .18
208 1/8 5/8 7/8 0.139 0.609 ± .009 3.530 15.470 ± .23
209 1/8 11/16 15/16 0.139 0.671 ± .009 3.530 17.040 ± .23
210 1/8 3/4 1 0.139 0.734 ± .010 3.530 18.640 ± .25
211 1/8 13/16 1-1/16 0.139 0.796 ± .010 3.530 20.220 ± .25
212 1/8 7/8 1-1/8 0.139 0.859 ± .010 3.530 21.820 ± .25
213 1/8 15/16 1-3/16 0.139 0.921 ± .010 3.530 23.390 ± .25
214 1/8 1 1-1/4 0.139 0.984 ± .010 3.530 24.990 ± .25
215 1/8 1-1/16 1-5/16 0.139 1.046 ± .010 3.530 26.570 ± .25
216 1/8 1-1/8 1-3/8 0.139 1.109 ± .012 3.530 28.170 ± .30
217 1/8 1-3/16 1-7/16 0.139 1.171 ± .012 3.530 29.740 ± .30
218 1/8 1-1/4 1-1/2 0.139 1.234 ± .012 3.530 31.340 ± .30
219 1/8 1-5/16 1-9/16 0.139 1.296 ± .012 3.530 32.920 ± .30
220 1/8 1-3/8 1-5/8 0.139 1.359 ± .012 3.530 34.520 ± .30
221 1/8 1-7/16 1-11/16 0.139 1.421 ± .012 3.530 36.090 ± .30
222 1/8 1-1/2 1-3/4 0.139 1.484 ± .015 3.530 37.690 ± .38
223 1/8 1-5/8 1-7/8 0.139 1.609 ± .015 3.530 40.870 ± .38
224 1/8 1-3/4 2 0.139 1.734 ± .015 3.530 44.040 ± .38
225 1/8 1-7/8 2-1/8 0.139 1.859 ± .018 3.530 47.220 ± .46
226 1/8 2 2-1/4 0.139 1.984 ± .018 3.530 50.390 ± .46
227 1/8 2-1/8 2-3/8 0.139 2.109 ± .018 3.530 53.570 ± .46
228 1/8 2-1/4 2-1/2 0.139 2.234 ± .020 3.530 56.740 ± .51
229 1/8 2-3/8 2-5/8 0.139 2.359 ± .020 3.530 59.920 ± .51
230 1/8 2-1/2 2-3/4 0.139 2.484 ± .020 3.530 63.090 ± .51
231 1/8 2-5/8 2-7/8 0.139 2.609 ± .020 3.530 66.270 ± .51
232 1/8 2-3/4 3 0.139 2.734 ± .024 3.530 69.440 ± .61
233 1/8 2-7/8 3-1/8 0.139 2.859 ± .024 3.530 72.620 ± .61
234 1/8 3 3-1/4 0.139 2.984 ± .024 3.530 75.790 ± .61
235 1/8 3-1/8 3-3/8 0.139 3.109 ± .024 3.530 78.970 ± .61
236 1/8 3-1/4 3-1/2 0.139 3.234 ± .024 3.530 82.140 ± .61
237 1/8 3-3/8 3-5/8 0.139 3.359 ± .024 3.530 85.320 ± .61
238 1/8 3-1/2 3-3/4 0.139 3.484 ± .024 3.530 88.490 ± .61
239 1/8 3-5/8 3-7/8 0.139 3.609 ± .028 3.530 91.670 ± .71
240 1/8 3-3/4 4 0.139 3.734 ± .028 3.530 94.840 ± .71
241 1/8 3-7/8 4-1/8 0.139 3.859 ± .028 3.530 98.020 ± .71
242 1/8 4 4-1/4 0.139 3.984 ± .028 3.530 101.190 ± .71
243 1/8 4-1/8 4-3/8 0.139 4.109 ± .028 3.530 104.370 ± .71
244 1/8 4-1/4 4-1/2 0.139 4.234 ± .030 3.530 107.540 ± .76
245 1/8 4-3/8 4-5/8 0.139 4.359 ± .030 3.530 110.720 ± .76
246 1/8 4-1/2 4-3/4 0.139 4.484 ± .030 3.530 113.890 ± .76
247 1/8 4-5/8 4-7/8 0.139 4.609 ± .030 3.530 117.070 ± .76
248 1/8 4-3/4 5 0.139 4.734 ± .030 3.530 120.240 ± .76
249 1/8 4-7/8 5-1/8 0.139 4.859 ± .035 3.530 123.420 ± .89
250 1/8 5 5-1/4 0.139 4.984 ± .035 3.530 126.590 ± .89
251 1/8 5-1/8 5-3/8 0.139 5.109 ± .035 3.530 129.770 ± .89
252 1/8 5-1/4 5-1/2 0.139 5.234 ± .035 3.530 132.940 ± .89
253 1/8 5-3/8 5-5/8 0.139 5.359 ± .035 3.530 136.120 ± .89
254 1/8 5-1/2 5-3/4 0.139 5.484 ± .035 3.530 139.290 ± .89
255 1/8 5-5/8 5-7/8 0.139 5.609 ± .035 3.530 142.470 ± .89
256 1/8 5-3/4 6 0.139 5.734 ± .035 3.530 145.640 ± .89
257 1/8 5-7/8 6-1/8 0.139 5.859 ± .035 3.530 148.820 ± .89
258 1/8 6 6-1/4 0.139 5.984 ± .035 3.530 151.990 ± .89
259 1/8 6-1/4 6-1/2 0.139 6.234 ± .040 3.530 158.340 ± 1.02
260 1/8 6-1/2 6-3/4 0.139 6.484 ± .040 3.530 164.690 ± 1.02
261 1/8 6-3/4 7 0.139 6.734 ± .040 3.530 171.040 ± 1.02
262 1/8 7 7-1/4 0.139 6.984 ± .040 3.530 177.390 ± 1.02
263 1/8 7-1/4 7-1/2 0.139 7.234 ± .045 3.530 183.740 ± 1.14
264 1/8 7-1/2 7-3/4 0.139 7.484 ± .045 3.530 190.090 ± 1.14
265 1/8 7-3/4 8 0.139 7.734 ± .045 3.530 196.440 ± 1.14
266 1/8 8 8-1/4 0.139 7.984 ± .045 3.530 202.790 ± 1.14
267 1/8 8-1/4 8-1/2 0.139 8.234 ± .050 3.530 209.140 ± 1.27
268 1/8 8-1/2 8-3/4 0.139 8.484 ± .050 3.530 215.490 ± 1.27
269 1/8 8-3/4 9 0.139 8.734 ± .050 3.530 221.840 ± 1.27
270 1/8 9 9-1/4 0.139 8.984 ± .050 3.530 228.190 ± 1.27
271 1/8 9-1/4 9-1/2 0.139 9.234 ± .055 3.530 234.540 ± 1.40
272 1/8 9-1/2 9-3/4 0.139 9.484 ± .055 3.530 240.890 ± 1.40
273 1/8 9-3/4 10 0.139 9.734 ± .055 3.530 247.240 ± 1.40
274 1/8 10 10-1/4 0.139 9.984 ± .055 3.530 253.590 ± 1.40
275 1/8 10-1/2 10-3/4 0.139 10.484 ± .055 3.530 266.290 ± 1.40
276 1/8 11 11-1/4 0.139 10.984 ± .065 3.530 278.990 ± 1.65
277 1/8 11-1/2 11-3/4 0.139 11.484 ± .065 3.530 291.690 ± 1.65
278 1/8 12 12-1/4 0.139 11.984 ± .065 3.530 304.390 ± 1.65
279 1/8 13 13-1/4 0.139 12.984 ± .065 3.530 329.790 ± 1.65
280 1/8 14 14-1/4 0.139 13.984 ± .065 3.530 355.190 ± 1.65
281 1/8 15 15-1/4 0.139 14.984 ± .065 3.530 380.590 ± 1.65
282 1/8 16 16-1/4 0.139 15.955 ± .075 3.530 405.260 ± 1.91
283 1/8 17 17-1/4 0.139 16.955 ± .080 3.530 430.660 ± 2.03
284 1/8 18 18-1/4 0.139 17.955 ± .085 3.530 456.060 ± 2.16
309 3/16 7/16 13/16 0.210 0.412 ± .005 5.330 10.460 ± .13
310 3/16 1/2 7/8 0.210 0.475 ± .005 5.330 12.070 ± .13
311 3/16 9/16 15/16 0.210 0.537 ± .007 5.330 13.640 ± .18
312 3/16 5/8 1 0.210 0.600 ± .009 5.330 15.240 ± .23
313 3/16 11/16 1-1/16 0.210 0.662 ± .009 5.330 16.810 ± .23
314 3/16 3/4 1-1/8 0.210 0.725 ± .010 5.330 18.420 ± .25
315 3/16 13/16 1-3/16 0.210 0.787 ± .010 5.330 19.990 ± .25
316 3/16 7/8 1-1/4 0.210 0.850 ± .010 5.330 21.590 ± .25
317 3/16 15/16 1-5/16 0.210 0.912 ± .010 5.330 23.160 ± .25
318 3/16 1 1-3/8 0.210 0.975 ± .010 5.330 24.770 ± .25
319 3/16 1-1/16 1-7/16 0.210 1.037 ± .010 5.330 26.340 ± .25
320 3/16 1-1/8 1-1/2 0.210 1.100 ± .012 5.330 27.940 ± .30
321 3/16 1-3/16 1-9/16 0.210 1.162 ± .012 5.330 29.510 ± .30
322 3/16 1-1/4 1-5/8 0.210 1.225 ± .012 5.330 31.120 ± .30
323 3/16 1-5/16 1-11/16 0.210 1.287 ± .012 5.330 32.690 ± .30
324 3/16 1-3/8 1-3/4 0.210 1.350 ± .012 5.330 34.290 ± .30
325 3/16 1-1/2 1-7/8 0.210 1.475 ± .015 5.330 37.470 ± .38
326 3/16 1-5/8 2 0.210 1.600 ± .015 5.330 40.640 ± .38
327 3/16 1-3/4 2-1/8 0.210 1.725 ± .015 5.330 43.820 ± .38
328 3/16 1-7/8 2-1/4 0.210 1.850 ± .015 5.330 46.990 ± .38
329 3/16 2 2-3/8 0.210 1.975 ± .018 5.330 50.170 ± .46
330 3/16 2-1/8 2-1/2 0.210 2.100 ± .018 5.330 53.340 ± .46
331 3/16 2-1/4 2-5/8 0.210 2.225 ± .018 5.330 56.520 ± .46
332 3/16 2-3/8 2-3/4 0.210 2.350 ± .018 5.330 59.690 ± .46
333 3/16 2-1/2 2-7/8 0.210 2.475 ± .020 5.330 62.870 ± .51
334 3/16 2-5/8 3 0.210 2.600 ± .020 5.330 66.040 ± .51
335 3/16 2-3/4 3-1/8 0.210 2.725 ± .020 5.330 69.220 ± .51
336 3/16 2-7/8 3-1/4 0.210 2.850 ± .020 5.330 72.390 ± .51
337 3/16 3 3-3/8 0.210 2.975 ± .024 5.330 75.570 ± .61
338 3/16 3-1/8 3-1/2 0.210 3.100 ± .024 5.330 78.740 ± .61
339 3/16 3-1/4 3-5/8 0.210 3.225 ± .024 5.330 81.920 ± .61
340 3/16 3-3/8 3-3/4 0.210 3.350 ± .024 5.330 85.090 ± .61
341 3/16 3-1/2 3-7/8 0.210 3.475 ± .024 5.330 88.270 ± .61
342 3/16 3-5/8 4 0.210 3.600 ± .028 5.330 91.440 ± .71
343 3/16 3-3/4 4-1/8 0.210 3.725 ± .028 5.330 94.620 ± .71
344 3/16 3-7/8 4-1/4 0.210 3.850 ± .028 5.330 97.790 ± .71
345 3/16 4 4-3/8 0.210 3.975 ± .028 5.330 100.970 ± .71
346 3/16 4-1/8 4-1/2 0.210 4.100 ± .028 5.330 104.140 ± .71
347 3/16 4-1/4 4-5/8 0.210 4.225 ± .030 5.330 107.320 ± .76
348 3/16 4-3/8 4-3/4 0.210 4.350 ± .030 5.330 110.490 ± .76
349 3/16 4-1/2 4-7/8 0.210 4.475 ± .030 5.330 113.670 ± .76
350 3/16 4-5/8 5 0.210 4.600 ± .030 5.330 116.840 ± .76
351 3/16 4-3/4 5-1/8 0.210 4.725 ± .030 5.330 120.020 ± .76
352 3/16 4-7/8 5-1/4 0.210 4.850 ± .030 5.330 123.190 ± .76
353 3/16 5 5-3/8 0.210 4.975 ± .037 5.330 126.370 ± .94
354 3/16 5-1/8 5-1/2 0.210 5.100 ± .037 5.330 129.540 ± .94
355 3/16 5-1/4 5-5/8 0.210 5.225 ± .037 5.330 132.720 ± .94
356 3/16 5-3/8 5-3/4 0.210 5.350 ± .037 5.330 135.890 ± .94
357 3/16 5-1/2 5-7/8 0.210 5.475 ± .037 5.330 139.070 ± .94
358 3/16 5-5/8 6 0.210 5.600 ± .037 5.330 142.240 ± .94
359 3/16 5-3/4 6-1/8 0.210 5.725 ± .037 5.330 145.420 ± .94
360 3/16 5-7/8 6-1/4 0.210 5.850 ± .037 5.330 148.590 ± .94
361 3/16 6 6-3/8 0.210 5.975 ± .037 5.330 151.770 ± .94
362 3/16 6-1/4 6-5/8 0.210 6.225 ± .040 5.330 158.120 ± 1.02
363 3/16 6-1/2 6-7/8 0.210 6.475 ± .040 5.330 164.470 ± 1.02
364 3/16 6-3/4 7-1/8 0.210 6.725 ± .040 5.330 170.820 ± 1.02
365 3/16 7 7-3/8 0.210 6.975 ± .040 5.330 177.170 ± 1.02
366 3/16 7-1/4 7-5/8 0.210 7.225 ± .045 5.330 183.520 ± 1.14
367 3/16 7-1/2 7-7/8 0.210 7.475 ± .045 5.330 189.870 ± 1.14
368 3/16 7-3/4 8-1/8 0.210 7.725 ± .045 5.330 196.220 ± 1.14
369 3/16 8 8-3/8 0.210 7.975 ± .045 5.330 202.570 ± 1.14
370 3/16 8-1/4 8-5/8 0.210 8.225 ± .050 5.330 208.920 ± 1.27
371 3/16 8-1/2 8-7/8 0.210 8.475 ± .050 5.330 215.270 ± 1.27
372 3/16 8-3/4 9-1/8 0.210 8.725 ± .050 5.330 221.620 ± 1.27
373 3/16 9 9-3/8 0.210 8.975 ± .050 5.330 227.970 ± 1.27
374 3/16 9-1/4 9-5/8 0.210 9.225 ± .055 5.330 234.320 ± 1.40
375 3/16 9-1/2 9-7/8 0.210 9.475 ± .055 5.330 240.670 ± 1.40
376 3/16 9-3/4 10-1/8 0.210 9.725 ± .055 5.330 247.020 ± 1.40
377 3/16 10 10-3/8 0.210 9.975 ± .055 5.330 253.370 ± 1.40
378 3/16 10-1/2 10-7/8 0.210 10.475 ± .060 5.330 266.070 ± 1.52
379 3/16 11 11-3/8 0.210 10.975 ± .060 5.330 278.770 ± 1.52
380 3/16 11-1/2 11-7/8 0.210 11.475 ± .065 5.330 291.470 ± 1.65
381 3/16 12 12-3/8 0.210 11.975 ± .065 5.330 304.170 ± 1.65
382 3/16 13 13-3/8 0.210 12.975 ± .065 5.330 329.570 ± 1.65
383 3/16 14 14-3/8 0.210 13.975 ± .070 5.330 354.970 ± 1.78
384 3/16 15 15-3/8 0.210 14.975 ± .070 5.330 380.370 ± 1.78
385 3/16 16 16-3/8 0.210 15.955 ± .075 5.330 405.260 ± 1.91
386 3/16 17 17-3/8 0.210 16.955 ± .080 5.330 430.660 ± 2.03
387 3/16 18 18-3/8 0.210 17.955 ± .085 5.330 456.060 ± 2.16
388 3/16 19 19-3/8 0.210 18.955 ± .090 5.330 481.460 ± 2.29
389 3/16 20 20-3/8 0.210 19.955 ± .095 5.330 506.860 ± 2.41
390 3/16 21 21-3/8 0.210 20.955 ± .095 5.330 532.260 ± 2.41
391 3/16 22 22-3/8 0.210 21.955 ± .095 5.330 557.660 ± 2.41
392 3/16 23 23-3/8 0.210 22.940 ± .105 5.330 582.680 ± 2.67
393 3/16 24 24-3/8 0.210 23.940 ± .110 5.330 608.080 ± 2.79
394 3/16 25 25-3/8 0.210 24.940 ± .115 5.330 633.480 ± 2.92
395 3/16 26 26-3/8 0.210 25.940 ± .120 5.330 658.880 ± 3.05
400 1/4 1-3/8 1-7/8 0.275 1.350 ± .012 6.990 34.290 ± .30
401 1/4 1-1/2 2 0.275 1.475 ± .015 6.990 37.470 ± .38
402 1/4 1-5/8 2-1/8 0.275 1.600 ± .015 6.990 40.640 ± .38
403 1/4 1-3/4 2-1/4 0.275 1.725 ± .015 6.990 43.820 ± .38
404 1/4 1-7/8 2-3/8 0.275 1.850 ± .015 6.990 46.990 ± .38
405 1/4 2 2-1/2 0.275 1.975 ± .018 6.990 50.170 ± .46
406 1/4 2-1/8 2-5/8 0.275 2.100 ± .018 6.990 53.340 ± .46
407 1/4 2-1/4 2-3/4 0.275 2.225 ± .018 6.990 56.520 ± .46
408 1/4 2-3/8 2-7/8 0.275 2.350 ± .018 6.990 59.690 ± .46
409 1/4 2-1/2 3 0.275 2.475 ± .020 6.990 62.870 ± .51
410 1/4 2-5/8 3-1/8 0.275 2.600 ± .020 6.990 66.040 ± .51
411 1/4 2-3/4 3-1/4 0.275 2.725 ± .020 6.990 69.220 ± .51
412 1/4 2-7/8 3-3/8 0.275 2.850 ± .020 6.990 72.390 ± .51
413 1/4 3 3-1/2 0.275 2.975 ± .024 6.990 75.570 ± .61
414 1/4 3-1/8 3-5/8 0.275 3.100 ± .024 6.990 78.740 ± .61
415 1/4 3-1/4 3-3/4 0.275 3.225 ± .024 6.990 81.920 ± .61
416 1/4 3-3/8 3-7/8 0.275 3.350 ± .024 6.990 85.090 ± .61
417 1/4 3-1/2 4 0.275 3.475 ± .024 6.990 88.270 ± .61
418 1/4 3-5/8 4-1/8 0.275 3.600 ± .028 6.990 91.440 ± .71
419 1/4 3-3/4 4-1/4 0.275 3.725 ± .028 6.990 94.620 ± .71
420 1/4 3-7/8 4-3/8 0.275 3.850 ± .028 6.990 97.790 ± .71
421 1/4 4 4-1/2 0.275 3.975 ± .028 6.990 100.970 ± .71
422 1/4 4-1/8 4-5/8 0.275 4.100 ± .028 6.990 104.140 ± .71
423 1/4 4-1/4 4-3/4 0.275 4.225 ± .030 6.990 107.320 ± .76
424 1/4 4-3/8 4-7/8 0.275 4.350 ± .030 6.990 110.490 ± .76
425 1/4 4-1/2 5 0.275 4.475 ± .033 6.990 113.670 ± .84
426 1/4 4-5/8 5-1/8 0.275 4.600 ± .033 6.990 116.840 ± .84
427 1/4 4-3/4 5-1/4 0.275 4.725 ± .033 6.990 120.020 ± .84
428 1/4 4-7/8 5-3/8 0.275 4.850 ± .033 6.990 123.190 ± .84
429 1/4 5 5-1/2 0.275 4.975 ± .037 6.990 126.370 ± .94
430 1/4 5-1/8 5-5/8 0.275 5.100 ± .037 6.990 129.540 ± .94
431 1/4 5-1/4 5-3/4 0.275 5.225 ± .037 6.990 132.720 ± .94
432 1/4 5-3/8 5-7/8 0.275 5.350 ± .037 6.990 135.890 ± .94
433 1/4 5-1/2 6 0.275 5.475 ± .037 6.990 139.070 ± .94
434 1/4 5-5/8 6-1/8 0.275 5.600 ± .037 6.990 142.240 ± .94
435 1/4 5-3/4 6-1/4 0.275 5.725 ± .037 6.990 145.420 ± .94
436 1/4 5-7/8 6-3/8 0.275 5.850 ± .037 6.990 148.590 ± .94
437 1/4 6 6-1/2 0.275 5.975 ± .037 6.990 151.770 ± .94
438 1/4 6-1/4 6-3/4 0.275 6.225 ± .040 6.990 158.120 ± 1.02
439 1/4 6-1/2 7 0.275 6.475 ± .040 6.990 164.470 ± 1.02
440 1/4 6-3/4 7-1/4 0.275 6.725 ± .040 6.990 170.820 ± 1.02
441 1/4 7 7-1/2 0.275 6.975 ± .040 6.990 177.170 ± 1.02
442 1/4 7-1/4 7-3/4 0.275 7.225 ± .045 6.990 183.520 ± 1.14
443 1/4 7-1/2 8 0.275 7.475 ± .045 6.990 189.870 ± 1.14
444 1/4 7-3/4 8-1/4 0.275 7.725 ± .045 6.990 196.220 ± 1.14
445 1/4 8 8-1/2 0.275 7.975 ± .045 6.990 202.570 ± 1.14
446 1/4 8-1/2 9 0.275 8.475 ± .055 6.990 215.270 ± 1.40
447 1/4 9 9-1/2 0.275 8.975 ± .055 6.990 227.970 ± 1.40
448 1/4 9-1/2 10 0.275 9.475 ± .055 6.990 240.670 ± 1.40
449 1/4 10 10-1/2 0.275 9.975 ± .055 6.990 253.370 ± 1.40
450 1/4 10-1/2 11 0.275 10.475 ± .060 6.990 266.070 ± 1.52
451 1/4 11 11-1/2 0.275 10.975 ± .060 6.990 278.770 ± 1.52
452 1/4 11-1/2 12 0.275 11.475 ± .060 6.990 291.470 ± 1.52
453 1/4 12 12-1/2 0.275 11.975 ± .060 6.990 304.170 ± 1.52
454 1/4 12-1/2 13 0.275 12.475 ± .060 6.990 316.870 ± 1.52
455 1/4 13 13-1/2 0.275 12.975 ± .060 6.990 329.570 ± 1.52
456 1/4 13-1/2 14 0.275 13.475 ± .070 6.990 342.270 ± 1.78
457 1/4 14 14-1/2 0.275 13.975 ± .070 6.990 354.970 ± 1.78
458 1/4 14-1/2 15 0.275 14.475 ± .070 6.990 367.670 ± 1.78
459 1/4 15 15-1/2 0.275 14.975 ± .070 6.990 380.370 ± 1.78
460 1/4 15-1/2 16 0.275 15.475 ± .070 6.990 393.070 ± 1.78
461 1/4 16 16-1/2 0.275 15.955 ± .075 6.990 405.260 ± 1.91
462 1/4 16-1/2 17 0.275 16.455 ± .075 6.990 417.960 ± 1.91
463 1/4 17 17-1/2 0.275 16.955 ± .080 6.990 430.660 ± 2.03
464 1/4 17-1/2 18 0.275 17.455 ± .085 6.990 443.360 ± 2.16
465 1/4 18 18-1/2 0.275 17.955 ± .085 6.990 456.060 ± 2.16
466 1/4 18-1/2 19 0.275 18.455 ± .085 6.990 468.760 ± 2.16
467 1/4 19 19-1/2 0.275 18.955 ± .090 6.990 481.460 ± 2.29
468 1/4 19-1/2 20 0.275 19.455 ± .090 6.990 494.160 ± 2.29
469 1/4 20 20-1/2 0.275 19.955 ± .095 6.990 506.860 ± 2.41
470 1/4 21 21-1/2 0.275 20.955 ± .095 6.990 532.260 ± 2.41
471 1/4 22 22-1/2 0.275 21.955 ± .100 6.990 557.660 ± 2.54
472 1/4 23 23-1/2 0.275 22.940 ± .105 6.990 582.680 ± 2.67
473 1/4 24 24-1/2 0.275 23.940 ± .110 6.990 608.080 ± 2.79
474 1/4 25 25-1/2 0.275 24.940 ± .115 6.990 633.480 ± 2.92
475 1/4 26 26-1/2 0.275 25.940 ± .120 6.990 658.880 ± 3.05
901 0.056 0.185 ± .005 1.420 4.700 ± .13
902 0.064 0.239 ± .005 1.630 6.070 ± .13
903 0.064 0.301 ± .005 1.630 7.650 ± .13
904 0.072 0.351 ± .005 1.830 8.920 ± .13
905 0.072 0.414 ± .005 1.830 10.520 ± .13
906 0.078 0.468 ± .005 1.980 11.890 ± .13
907 0.082 0.530 ± .007 2.080 13.460 ± .18
908 0.087 0.644 ± .009 2.210 16.360 ± .23
909 0.097 0.706 ± .009 2.460 17.930 ± .23
910 0.097 0.755 ± .009 2.460 19.180 ± .23
911 0.116 0.863 ± .009 2.950 21.920 ± .23
912 0.116 0.924 ± .009 2.950 23.470 ± .23
913 0.116 0.986 ± .010 2.950 25.040 ± .25
914 0.116 1.047 ± .010 2.950 26.590 ± .25
916 0.116 1.171 ± .010 2.950 29.740 ± .25
918 0.116 1.355 ± .012 2.950 34.420 ± .30
920 0.118 1.475 ± .014 3.000 37.470 ± .36
924 0.118 1.720 ± .014 3.000 43.690 ± .36
928 0.118 2.090 ± .018 3.000 53.090 ± .46
932 0.118 2.337 ± .018 3.000 59.360 ± .46
Dash # CS Nominal ID Nominal OD Nominal CS Inch ID Inch Tol Inch CS mm ID mm Tol mm

History

This size chart was first published in 1971 by the A-6c2 Seals Committee at SAE (Society of Automotive Engineers) as Aerospace Standard AS568. These standards were later republished in 1974 as AS568A, in 2001 as AS568B, and most recently in 2008 as AS568C. Any of these terms (AS568, AS568A, AS568B, AS568C) may be used interchangeably when referring to an o-ring dash size.

Actual vs. Nominal

To assist our customers in selecting the correct size o-ring we have included 3 measurements for cross reference purposes; the “Nominal”, “Actual Inch”, and “Actual Metric” sizes. We are often asked “What is the difference between Actual and Nominal sizes for o-rings?”. The Nominal (fractional) dimensions are in name only (often used when verbally describing the size). For more accurate measurements, please refer to the actual inch or millimeter sizes, as these are the true dimensions of the o-ring.

O-Ring Formulas:

To calculate an o-ring’s outside diameter (OD) you may use this formula: 2(CS) + ID = OD
Conversely, if you have the OD and need to find the ID use this formula: OD – 2(CS) = ID