Thread Chart
| Thread Size | Class | Nominal | Minor Dia. Minimum | Minor Dia. Maximum | Major Dia. | Thread Size | Cutting Tap Drill | Form Tap Drill |
| 00-90 | 2B | 0.0470 | .0350 | .0393 | 0.0470 | 00-90 | #65 | X |
| 0-80 | 2B | 0.0600 | 0.0465 | 0.0514 | 0.0600 | 0-80 | 3/64 | #54 |
| 1-64 | 2B | 0.0730 | 0.0561 | 0.0623 | 0.0730 | 1-64 | #53 | #51 |
| 1-72 | 2B | 0.0730 | 0.0580 | 0.0635 | 0.0730 | 1-72 | #53 | #51 |
| 2-56 | 2B | 0.0860 | 0.0667 | 0.0737 | 0.0860 | 2-56 | #50 | #47 |
| 2-64 | 2B | 0.0860 | 0.0691 | 0.0753 | 0.0860 | 2-64 | #50 | 2mm |
| 3-48 | 2B | 0.0990 | 0.0764 | 0.0845 | 0.0990 | 3-48 | #47 | 2,3mm |
| 3-56 | 2B | 0.0990 | 0.0797 | 0.0865 | 0.0990 | 3-56 | #45 | 2,3mm |
| 4-40 | 2B | 0.1120 | 0.0849 | 0.0939 | 0.1120 | 4-40 | #43 | #39 |
| 4-48 | 2B | 0.1120 | 0.0894 | 0.0968 | 0.1120 | 4-48 | #42 | #37 |
| 5-40 | 2B | 0.1250 | 0.0979 | 0.1062 | 0.1250 | 5-40 | #38 | #33 |
| 5-44 | 2B | 0.1250 | 0.1004 | 0.1079 | 0.1250 | 5-44 | #37 | #33 |
| 6-32 | 2B | 0.1380 | 0.1040 | 0.1140 | 0.1380 | 6-32 | #36 | 3,1mm |
| 6-40 | 2B | 0.1380 | 0.1110 | 0.1190 | 0.1380 | 6-40 | #33 | 1/8 |
| 8-32 | 2B | 0.1640 | 0.1300 | 0.1390 | 0.1640 | 8-32 | #29 | #25 |
| 8-36 | 2B | 0.1640 | 0.1340 | 0.1420 | 0.1640 | 8-36 | #29 | #24 |
| 10-24 | 2B | 0.1900 | 0.1450 | 0.1560 | 0.1900 | 10-24 | #25 | 11/64 |
| 10-32 | 2B | 0.1900 | 0.1560 | 0.1640 | 0.1900 | 10-32 | #21 | #16 |
| 12-24 | 2B | 0.2160 | 0.1709 | 0.1807 | 0.2160 | 12-24 | #16 | #9 |
| 12-28 | 2B | 0.2160 | 0.1773 | 0.1858 | 0.2160 | 12-28 | #14 | #7 |
| 1/4-20 | 2B | 0.2500 | .1960 | .2070 | 0.2500 | 1/4-20 | #7 | 5,75mm |
| 1/4-28 | 2B | 0.2500 | 0.2110 | 0.2200 | 0.2500 | 1/4-28 | #3 | “A” |
| 5/16-18 | 2B | 0.3125 | 0.2520 | 0.2650 | 0.3125 | 5/16-18 | “F” | 7,25mm |
| 5/16-24 | 2B | 0.1325 | 0.2670 | 0.2770 | 0.1325 | 5/16-24 | “I” | .293 |
| 3/8-16 | 2B | 0.3750 | 0.3070 | 0.3210 | 0.3750 | 3/8-16 | 5/16 | “S” |
| 3/8-24 | 2B | 0.3750 | .3300 | .3400 | 0.3750 | 3/8-24 | “Q” | 9mm |
| 7/16-14 | 2B | 0.4375 | .3600 | .3760 | 0.4375 | 7/16-14 | “U” | “Y” |
| 7/16-20 | 2B | 0.4375 | .3830 | .3950 | 0.4375 | 7/16-20 | 24/64 | “Z” |
| 1/2-13 | 2B | 0.5000 | 0.4170 | 0.4340 | 0.5000 | 1/2-13 | 27/64 | .463 |
| 1/2-20 | 2B | 0.5000 | 0.4460 | 0.4570 | 0.5000 | 1/2-20 | 29/64 | .476 |
| 9/16-12 | 2B | 0.5625 | 0.4720 | 0.4900 | 0.5625 | 9/16-12 | 31/64 | .521 |
| 9/16-18 | 2B | 0.5625 | 0.5020 | 0.5150 | 0.5625 | 9/16-18 | 33/64 | .536 |
| 9/16-24 | 2B | 0.5625 | 0.5170 | 0.5270 | 0.5625 | 9/16-24 | 33/64 | .536 |
| 5/8-11 | 2B | 0.6250 | 0.5270 | 0.5460 | 0.6250 | 5/8-11 | 17/32 | 37/64 |
| 5/8-18 | 2B | 0.6250 | 0.5650 | 0.5780 | 0.6250 | 5/8-18 | 9/16 | .598 |
| 3/4-10 | 2B | 0.7500 | 0.6240 | 0.6630 | 0.7500 | 3/4-10 | 21/32 | 45/64 |
| 3/4-16 | 2B | 0.7500 | 0.6820 | 0.6960 | 0.7500 | 3/4-16 | 11/16 | 23/32 |
| 7/8-9 | 2B | 0.8750 | 0.7550 | 0.7780 | 0.8750 | 7/8-9 | 49/64 | .823 |
| 7/8-14 | 2B | 0.8750 | 0.7980 | 0.8140 | 0.8750 | 7/8-14 | 13/16 | 27/32 |
| 1.0-8 | 2B | 1.0000 | 0.8650 | 0.8900 | 1.0000 | 1.0-8 | 7/8 | 15/16 |
| 1.0-12 | 2B | 1.0000 | 0.9100 | 0.9280 | 1.0000 | 1.0-12 | 59/64 | .963 |