| Tube Size | Dimensions in Inches | Dimensions in Millimeters | ||||
| AS568A | Dash No. | O.D | I.D. ± Tolerance | C/S ± Tolerance | I.D.± Tolerance | C/S ± Tolerance |
| 901 | - | 3/32 | .185 ± .005 | .056 ± .003 | 4.700 ± .13 | 1.420 ± .08 |
| 902 | 2 | 1/8 | .239 ± .005 | .064 ± .003 | 6.070 ± .13 | 1.630 ± .08 |
| 903 | 3 | 3/16 | .301 ± .005 | .064 ± .003 | 7.650 ± .13 | 1.630 ± .08 |
| 904 | 4 | 1/4 | .351 ± .005 | .072 ± .003 | 8.900 ± .13 | 1.830 ± .08 |
| 905 | 5 | 5/16 | .414 ± .005 | .072 ± .003 | 10.510 ± .13 | 1.830 ± .08 |
| 906 | 6 | 3/8 | .468 ± .005 | .078 ± .003 | 11.900 ± .13 | 1.980 ± .08 |
| 907 | - | 7/16 | .530 ± .007 | .082 ± .003 | 13.460 ± .18 | 2.080 ± .08 |
| 908 | 8 | 1/2 | .644 ± .009 | .087 ± .003 | 16.360 ± .23 | 2.200 ± .08 |
| 909 | - | 9/16 | .706 ± .009 | .097 ± .003 | 17.930 ± .23 | 2.460 ± .08 |
| 910 | 10 | 5/8 | .755 ± .009 | .097 ± .003 | 19.180 ± .23 | 2.460 ± .08 |
| 911 | - | 11/16 | .863 ± .009 | .116 ± .004 | 21.920 ± .23 | 2.950 ± .10 |
| 912 | 12 | 3/4 | .924 ± .009 | .116 ± .004 | 23.470 ± .23 | 2.950 ± .10 |
| 913 | - | 13/16 | .986 ± .010 | .116 ± .004 | 25.040 ± .25 | 2.950 ± .10 |
| 914 | - | 7/8 | 1.047 ± .010 | .116 ± .004 | 26.620 ± .25 | 2.950 ± .10 |
| 916 | 16 | 1 | 1.171 ± .010 | .116 ± .004 | 29.740 ± .25 | 2.950 ± .10 |
| 918 | - | 1-1/8 | 1.355 ± .012 | .116 ± .004 | 34.420 ± .30 | 2.950 ± .10 |
| 920 | 20 | 1-1/4 | 1.475 ± .014 | .118 ± .004 | 37.460 ± .36 | 3.000 ± .10 |
| 924 | 24 | 1-1/2 | 1.720 ± .014 | .118 ± .004 | 43.700 ± .36 | 3.000 ± .10 |
| 928 | 28 | 1-3/4 | 2.090 ± .018 | .118 ± .004 | 53.100 ± .46 | 3.000 ± .10 |
| 932 | 32 | 2 | 2.337 ± .018 | .118 ± .004 | 59.360 ± .46 | 3.000 ± .10 |