| AS568 No. | Nominal Reference | Actual Dimensions | |||
| I.D. | O.D. | Width | I.D. Tolerance | Width Tolerance | |
| -309 | 7/16 | 13/16 | 3/16 | .412 ± .005 | .210 ± .005 |
| -310 | 1/2 | 7/8 | 3/16 | .475 ± .005 | .210 ± .005 |
| -311 | 9/16 | 15/16 | 3/16 | .537 ± .007 | .210 ± .005 |
| -312 | 3/8 | 1 | 3/16 | .600 ± .009 | .210 ± .005 |
| -313 | 11/16 | 1 1/16 | 3/16 | .662 ± .009 | .210 ± .005 |
| -314 | 3/4 | 1 1/8 | 3/16 | .725 ± .010 | .210 ± .005 |
| -315 | 13/16 | 1 3/16 | 3/16 | .787 ± .010 | .210 ± .005 |
| -316 | 7/8 | 1 1/4 | 3/16 | .850 ± .010 | .210 ± .005 |
| -317 | 15/16 | 1 5/16 | 3/16 | .912 ± .010 | .210 ± .005 |
| -318 | 1 | 1 3/8 | 3/16 | .975 ± .010 | .210 ± .005 |
| -319 | 1 1/16 | 1 7/16 | 3/16 | 1.037 ± .010 | .210 ± .005 |
| -320 | 1 1/8 | 1 1/2 | 3/16 | 1.100 ± .012 | .210 ± .005 |
| -321 | 1 3/16 | 1 9/16 | 3/16 | 1.162 ± .012 | .210 ± .005 |
| -322 | 1 1/4 | 1 5/8 | 3/16 | 1.225 ± .012 | .210 ± .005 |
| -323 | 1 5/16 | 1 11/16 | 3/16 | 1.287 ± .012 | .210 ± .005 |
| -324 | 1 3/8 | 1 3/4 | 3/16 | 1.350 ± .012 | .210 ± .005 |
| -325 | 1 1/2 | 1 7/8 | 3/16 | 1.475 ± .015 | .210 ± .005 |
| -326 | 1 5/8 | 2 | 3/16 | 1.600 ± .015 | .210 ± .005 |
| -327 | 1 3/4 | 2 1/8 | 3/16 | 1.725 ± .015 | .210 ± .005 |
| -328 | 1 7/8 | 2 1/4 | 3/16 | 1.850 ± .015 | .210 ± .005 |
| -329 | 2 | 2 3/8 | 3/16 | 1.975 ± .018 | .210 ± .005 |
| -330 | 2 1/8 | 2 1/2 | 3/16 | 2.100 ± .018 | .210 ± .005 |
| -331 | 2 1/4 | 2 5/8 | 3/16 | 2.225 ± .018 | .210 ± .005 |
| -332 | 2 3/8 | 2 3/4 | 3/16 | 2.350 ± .018 | .210 ± .005 |
| -333 | 2 1/2 | 2 7/8 | 3/16 | 2.475 ± .020 | .210 ± .005 |
| -334 | 2 5/8 | 3 | 3/16 | 2.600 ± .020 | .210 ± .005 |
| -335 | 2 3/4 | 3 1/8 | 3/16 | 2.725 ± .020 | .210 ± .005 |
| -336 | 2 7/8 | 3 1/4 | 3/16 | 2.850 ± .020 | .210 ± .005 |
| -337 | 3 | 3 3/8 | 3/16 | 2.975 ± .024 | .210 ± .005 |
| -338 | 3 1/8 | 3 1/2 | 3/16 | 3.100 ± .024 | .210 ± .005 |
| -339 | 3 1/4 | 3 5/8 | 3/16 | 3.225 ± .024 | .210 ± .005 |
| -340 | 3 3/8 | 3 3/4 | 3/16 | 3.350 ± .024 | .210 ± .005 |
| -341 | 3 1/2 | 3 7/8 | 3/16 | 3.475 ± .024 | .210 ± .005 |
| -342 | 3 5/8 | 4 | 3/16 | 3.600 ± .028 | .210 ± .005 |
| -343 | 3 3/4 | 4 1/8 | 3/16 | 3.725 ± .028 | .210 ± .005 |
| -344 | 3 7/8 | 4 1/4 | 3/16 | 3.850 ± .028 | .210 ± .005 |
| -345 | 4 | 4 3/8 | 3/16 | 3.975 ± .028 | .210 ± .005 |
| -346 | 4 1/8 | 4 1/2 | 3/16 | 4.100 ± .028 | .210 ± .005 |
| -347 | 4 1/4 | 4 5/8 | 3/16 | 4.225 ± .030 | .210 ± .005 |
| -348 | 4 3/8 | 4 3/4 | 3/16 | 4.350 ± .030 | .210 ± .005 |
| -349 | 4 1/2 | 4 7/8 | 3/16 | 4.475 ± .030 | .210 ± .005 |
| -350 | 4 5/8 | 5 | 3/16 | 4.600 ± .030 | .210 ± .005 |