Commonly used where greater depth of thread better resists stripping of internal thread. This thread may be found in certain products of the clampnut series (CNC, CNC-A, CNC-S, SNC, SNC-A, SNC-S).
| Threads | Major Dia | Pitch Dia | Minor Dia | |||
|---|---|---|---|---|---|---|
| Thread Size | Per Inch | Max | Min | Max | Min | Max |
| 8 - 32 | 32 | 0.1640 | 0.1580 | 0.1437 | 0.1415 | 0.1257 |
| 10 - 24 | 24 | 0.1900 | 0.1828 | 0.1629 | 0.1604 | 0.1389 |
| 1/4 - 20 | 20 | 0.2500 | 0.2419 | 0.2175 | 0.2147 | 0.1887 |
| 5/16 - 18 | 18 | 0.3125 | 0.3038 | 0.2764 | 0.2734 | 0.2443 |
| 3/8 - 16 | 16 | 0.3750 | 0.3656 | 0.3344 | 0.3311 | 0.2983 |
| 7/16 - 14 | 14 | 0.4375 | 0.4272 | 0.3911 | 0.3876 | 0.3499 |
| 1/2 - 13 | 13 | 0.5000 | 0.4891 | 0.4500 | 0.4463 | 0.4056 |
| 5/8 - 11 | 11 | 0.6250 | 0.6129 | 0.5660 | 0.5619 | 0.5135 |
| 3/4 - 10 | 10 | 0.7500 | 0.7371 | 0.6850 | 0.6806 | 0.6273 |
| 7/8 - 9 | 9 | 0.8750 | 0.8611 | 0.8028 | 0.7981 | 0.7387 |
| 1 - 8 | 8 | 1.0000 | 0.9850 | 0.9188 | 0.9137 | 0.8466 |
| 1 1/8 - 7 | 7 | 1.1250 | 1.1086 | 1.0322 | 1.0268 | 0.9497 |
| 1 1/4 - 7 | 7 | 1.2500 | 1.2336 | 1.1572 | 1.1517 | 1.0747 |
| 1 3/8 - 6 | 6 | 1.3750 | 1.3568 | 1.2667 | 1.2607 | 1.1705 |
| 1 1/2 - 6 | 6 | 1.5000 | 1.4818 | 1.3917 | 1.3856 | 1.2955 |
| 1 3/4 - 5 | 5 | 1.7500 | 1.7295 | 1.6201 | 1.6134 | 1.5046 |
| 2 - 4 1/2 | 4 1/2 | 2.0000 | 1.9780 | 1.8557 | 1.8486 | 1.7274 |
| 2 1/4 - 4 1/2 | 4 1/2 | 2.2500 | 2.2280 | 2.1057 | 2.0984 | 1.9774 |
| 2 1/2 - 4 | 4 | 2.5000 | 2.4762 | 2.3376 | 2.3298 | 2.1933 |
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