Below is a table of 200 series standard o-ring (0.139″ CS) sizes. This table goes from 201-264 ID sizes (0.139″ CS).
If you don’t understand the sizes, check out O-Ring Sizes. If you don’t know how to use the O-Rings, check out O-Ring Design for Static Sealing.
| AS 568A No. | Nominal Sizes (inch) | Actual Sizes (inch) | |||
| ID | OD | Width | ID | Width | |
| 201 | 3/16 | 7/16 | 1/8 | 0.171 ± 0.005 | 0.139 ± 0.004 |
| 202 | 1/4 | 1/2 | 1/8 | 0.234 ± 0.005 | 0.139 ± 0.004 |
| 203 | 5/16 | 9/16 | 1/8 | 0.296 ± 0.005 | 0.139 ± 0.004 |
| 204 | 3/8 | 5/8 | 1/8 | 0.359 ± 0.005 | 0.139 ± 0.004 |
| 205 | 7/16 | 11/16 | 1/8 | 0.421 ± 0.005 | 0.139 ± 0.004 |
| 206 | 1/2 | 3/4 | 1/8 | 0.484 ± 0.005 | 0.139 ± 0.004 |
| 207 | 9/16 | 13/16 | 1/8 | 0.546 ± 0.007 | 0.139 ± 0.004 |
| 208 | 5/8 | 7/8 | 1/8 | 0.609 ± 0.009 | 0.139 ± 0.004 |
| 209 | 11/16 | 15/16 | 1/8 | 0.671 ± 0.009 | 0.139 ± 0.004 |
| 210 | 3/4 | 1 | 1/8 | 0.734 ± 0.010 | 0.139 ± 0.004 |
| 211 | 13/16 | 11/16 | 1/8 | 0.796 ± 0.010 | 0.139 ± 0.004 |
| 212 | 7/8 | 11/8 | 1/8 | 0.859 ± 0.010 | 0.139 ± 0.004 |
| 213 | 15/16 | 13/16 | 1/8 | 0.921 ± 0.010 | 0.139 ± 0.004 |
| 214 | 1 | 11/4 | 1/8 | 0.984 ± 0.010 | 0.139 ± 0.004 |
| 215 | 11/16 | 15/16 | 1/8 | 1.046 ± 0.010 | 0.139 ± 0.004 |
| 216 | 11/8 | 13/8 | 1/8 | 1.109 ± 0.012 | 0.139 ± 0.004 |
| 217 | 13/16 | 17/16 | 1/8 | 1.171 ± 0.012 | 0.139 ± 0.004 |
| 218 | 11/4 | 11/2 | 1/8 | 1.234 ± 0.012 | 0.139 ± 0.004 |
| 219 | 15/16 | 19/16 | 1/8 | 1.296 ± 0.012 | 0.139 ± 0.004 |
| 220 | 13/8 | 15/8 | 1/8 | 1.359 ± 0.012 | 0.139 ± 0.004 |
| 221 | 17/16 | 111/16 | 1/8 | 1.421 ± 0.012 | 0.139 ± 0.004 |
| 222 | 11/2 | 13/4 | 1/8 | 1.484 ± 0.015 | 0.139 ± 0.004 |
| 223 | 15/8 | 17/8 | 1/8 | 1.609 ± 0.015 | 0.139 ± 0.004 |
| 224 | 13/4 | 2 | 1/8 | 1.734 ± 0.015 | 0.139 ± 0.004 |
| 225 | 17/8 | 21/8 | 1/8 | 1.859 ± 0.018 | 0.139 ± 0.004 |
| 226 | 2 | 21/4 | 1/8 | 1.984 ± 0.018 | 0.139 ± 0.004 |
| 227 | 21/8 | 23/8 | 1/8 | 2.109 ± 0.018 | 0.139 ± 0.004 |
| 228 | 21/4 | 21/2 | 1/8 | 2.234 ± 0.020 | 0.139 ± 0.004 |
| 229 | 23/8 | 25/8 | 1/8 | 2.359 ± 0.020 | 0.139 ± 0.004 |
| 230 | 21/2 | 23/4 | 1/8 | 2.484 ± 0.020 | 0.139 ± 0.004 |
| 231 | 25/8 | 27/8 | 1/8 | 2.609 ± 0.020 | 0.139 ± 0.004 |
| 232 | 23/4 | 3 | 1/8 | 2.734 ± 0.024 | 0.139 ± 0.004 |
| 233 | 27/8 | 31/8 | 1/8 | 2.859 ± 0.024 | 0.139 ± 0.004 |
| 234 | 3 | 31/4 | 1/8 | 2.984 ± 0.024 | 0.139 ± 0.004 |
| 235 | 31/8 | 33/8 | 1/8 | 3.109 ± 0.024 | 0.139 ± 0.004 |
| 236 | 31/4 | 31/2 | 1/8 | 3.234 ± 0.024 | 0.139 ± 0.004 |
| 237 | 33/8 | 35/8 | 1/8 | 3.359 ± 0.024 | 0.139 ± 0.004 |
| 238 | 31/2 | 33/4 | 1/8 | 3.484 ± 0.024 | 0.139 ± 0.004 |
| 239 | 35/8 | 37/8 | 1/8 | 3.609 ± 0.028 | 0.139 ± 0.004 |
| 240 | 33/4 | 4 | 1/8 | 3.734 ± 0.028 | 0.139 ± 0.004 |
| 241 | 37/8 | 41/8 | 1/8 | 3.859 ± 0.028 | 0.139 ± 0.004 |
| 242 | 4 | 41/4 | 1/8 | 3.984 ± 0.028 | 0.139 ± 0.004 |
| 243 | 41/8 | 43/8 | 1/8 | 4.109 ± 0.028 | 0.139 ± 0.004 |
| 244 | 41/4 | 41/2 | 1/8 | 4.234 ± 0.030 | 0.139 ± 0.004 |
| 245 | 43/8 | 45/8 | 1/8 | 4.359 ± 0.030 | 0.139 ± 0.004 |
| 246 | 41/2 | 43/4 | 1/8 | 4.484 ± 0.030 | 0.139 ± 0.004 |
| 247 | 45/8 | 47/8 | 1/8 | 4.609 ± 0.030 | 0.139 ± 0.004 |
| 248 | 43/4 | 5 | 1/8 | 4.734 ± 0.030 | 0.139 ± 0.004 |
| 249 | 47/8 | 51/8 | 1/8 | 4.859 ± 0.030 | 0.139 ± 0.004 |
| 250 | 5 | 51/4 | 1/8 | 4.984 ± 0.035 | 0.139 ± 0.004 |
| 251 | 51/8 | 53/8 | 1/8 | 5.109 ± 0.035 | 0.139 ± 0.004 |
| 252 | 51/4 | 51/2 | 1/8 | 5.234 ± 0.035 | 0.139 ± 0.004 |
| 253 | 53/8 | 55/8 | 1/8 | 5.359 ± 0.035 | 0.139 ± 0.004 |
| 254 | 51/2 | 53/4 | 1/8 | 5.484 ± 0.035 | 0.139 ± 0.004 |
| 255 | 55/8 | 57/8 | 1/8 | 5.609 ± 0.035 | 0.139 ± 0.004 |
| 256 | 53/4 | 6 | 1/8 | 5.734 ± 0.035 | 0.139 ± 0.004 |
| 257 | 57/8 | 61/8 | 1/8 | 5.859 ± 0.035 | 0.139 ± 0.004 |
| 258 | 6 | 61/4 | 1/8 | 5.984 ± 0.035 | 0.139 ± 0.004 |
| 259 | 61/4 | 61/2 | 1/8 | 6.234 ± 0.040 | 0.139 ± 0.004 |
| 260 | 61/2 | 63/4 | 1/8 | 6.484 ± 0.040 | 0.139 ± 0.004 |
| 261 | 63/4 | 7 | 1/8 | 6.734 ± 0.040 | 0.139 ± 0.004 |
| 262 | 7 | 71/4 | 1/8 | 6.984 ± 0.040 | 0.139 ± 0.004 |
| 263 | 71/4 | 71/2 | 1/8 | 7.234 ± 0.045 | 0.139 ± 0.004 |
| 264 | 71/2 | 73/4 | 1/8 | 7.484 ± 0.045 | 0.139 ± 0.004 |
Other Sizes:
000 Series Standard O-Ring Table (001-114)
100 Series Standard O-Ring Table (115-178)
200 Series Standard O-Ring Table (201-264)
300 Series Standard O-Ring Table (265-349)
400 Series Standard O-Ring Table (350-439)