engineering fundamentals AS 568A Standard O-Ring Sizes
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AS 568A Std Sizes
  001 to 114
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AS 568A No. Covered Range
("W" is the O-ring cross-section diameter, also called the "width")
001 to 114 ID from 0.029" to 0.070" for W=0.040"; 0.042" for W=0.050"; 0.056" for W=0.060"; from 0.070" to 5.239" for W=0.070"; from 0.049" to 0.612" for W=0.103"
115 to 178 ID from 0.674" to 9.737" for W=0.103"
201 to 264 ID from 0.171" to 7.484" for W=0.139"
265 to 349 ID from 7.734" to 17.955" for W=0.139"; from 0.412" to 4.475" for W=0.210"
350 to 439 ID from 4.600" to 25.940" for W=0.210"; from 4.475" to 6.475" for W=0.275"
 
AS 568A No. Nominal Sizes (inch) Actual Sizes (inch)
ID OD Width ID Width
115 11/16 7/8 3/32 0.674 ± 0.009 0.103 ± 0.003
116 3/4 15/16 3/32 0.737 ± 0.009 0.103 ± 0.003
117 13/16 1 3/32 0.799 ± 0.010 0.103 ± 0.003
118 7/8 11/16 3/32 0.862 ± 0.010 0.103 ± 0.003
119 15/16 11/8 3/32 0.924 ± 0.010 0.103 ± 0.003
120 1 13/16 3/32 0.987 ± 0.010 0.103 ± 0.003
121 11/16 11/4 3/32 1.049 ± 0.010 0.103 ± 0.003
122 11/8 15/16 3/32 1.112 ± 0.010 0.103 ± 0.003
123 13/16 13/8 3/32 1.174 ± 0.012 0.103 ± 0.003
124 11/4 17/16 3/32 1.237 ± 0.012 0.103 ± 0.003
125 15/16 11/2 3/32 1.299 ± 0.012 0.103 ± 0.003
126 13/8 19/16 3/32 1.362 ± 0.012 0.103 ± 0.003
127 17/16 15/8 3/32 1.424 ± 0.012 0.103 ± 0.003
128 11/2 111/16 3/32 1.487 ± 0.012 0.103 ± 0.003
129 19/16 13/4 3/32 1.549 ± 0.012 0.103 ± 0.003
130 15/8 113/16 3/32 1.612 ± 0.015 0.103 ± 0.003
131 111/16 17/8 3/32 1.674 ± 0.015 0.103 ± 0.003
132 13/4 115/16 3/32 1.737 ± 0.015 0.103 ± 0.003
133 113/16 2 3/32 1.799 ± 0.015 0.103 ± 0.003
134 17/8 21/16 3/32 1.862 ± 0.015 0.103 ± 0.003
135 115/16 21/8 3/32 1.925 ± 0.017 0.103 ± 0.003
136 2 23/16 3/32 1.987 ± 0.017 0.103 ± 0.003
137 21/16 21/4 3/32 2.050 ± 0.017 0.103 ± 0.003
138 21/8 25/16 3/32 2.112 ± 0.017 0.103 ± 0.003
139 23/16 23/8 3/32 2.175 ± 0.017 0.103 ± 0.003
140 21/4 27/16 3/32 2.237 ± 0.017 0.103 ± 0.003
141 25/16 21/2 3/32 2.300 ± 0.020 0.103 ± 0.003
142 23/8 29/16 3/32 2.362 ± 0.020 0.103 ± 0.003
143 27/16 25/8 3/32 2.425 ± 0.020 0.103 ± 0.003
144 21/2 211/16 3/32 2.487 ± 0.020 0.103 ± 0.003
145 29/16 23/4 3/32 2.550 ± 0.020 0.103 ± 0.003
146 25/8 213/16 3/32 2.612 ± 0.022 0.103 ± 0.003
147 211/16 27/8 3/32 2.675 ± 0.022 0.103 ± 0.003
148 23/4 215/16 3/32 2.737 ± 0.022 0.103 ± 0.003
149 215/16 3 3/32 2.800 ± 0.022 0.103 ± 0.003
150 27/8 31/16 3/32 2.862 ± 0.022 0.103 ± 0.003
151 3 33/16 3/32 2.987 ± 0.024 0.103 ± 0.003
152 31/4 37/16 3/32 3.237 ± 0.024 0.103 ± 0.003
153 31/2 311/16 3/32 3.487 ± 0.024 0.103 ± 0.003
154 33/4 315/16 3/32 3.737 ± 0.028 0.103 ± 0.003
155 4 43/16 3/32 3.987 ± 0.028 0.103 ± 0.003
156 41/4 47/16 3/32 4.237 ± 0.030 0.103 ± 0.003
157 41/2 411/16 3/32 4.487 ± 0.030 0.103 ± 0.003
158 43/4 415/16 3/32 4.737 ± 0.030 0.103 ± 0.003
159 5 53/16 3/32 4.987 ± 0.035 0.103 ± 0.003
160 51/4 57/16 3/32 5.237 ± 0.035 0.103 ± 0.003
161 51/2 511/16 3/32 5.487 ± 0.035 0.103 ± 0.003
162 53/4 515/16 3/32 5.737 ± 0.035 0.103 ± 0.003
163 6 63/16 3/32 5.987 ± 0.035 0.103 ± 0.003
164 61/4 67/16 3/32 6.237 ± 0.040 0.103 ± 0.003
165 61/2 611/16 3/32 6.487 ± 0.040 0.103 ± 0.003
166 63/4 615/16 3/32 6.737 ± 0.040 0.103 ± 0.003
167 7 73/16 3/32 6.987 ± 0.040 0.103 ± 0.003
168 71/4 77/16 3/32 7.237 ± 0.045 0.103 ± 0.003
169 71/2 711/16 3/32 7.487 ± 0.045 0.103 ± 0.003
170 73/4 715/16 3/32 7.737 ± 0.045 0.103 ± 0.003
171 8 83/16 3/32 7.987 ± 0.045 0.103 ± 0.003
172 81/4 87/16 3/32 8.237 ± 0.050 0.103 ± 0.003
173 81/2 811/16 3/32 8.487 ± 0.050 0.103 ± 0.003
174 83/4 815/16 3/32 8.737 ± 0.050 0.103 ± 0.003
175 9 93/16 3/32 8.987 ± 0.050 0.103 ± 0.003
176 91/4 97/16 3/32 9.237 ± 0.055 0.103 ± 0.003
177 91/2 911/16 3/32 9.487 ± 0.055 0.103 ± 0.003
178 93/4 915/16 3/32 9.737 ± 0.055 0.103 ± 0.003
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