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ISO7-1 (DIN2999)
| Designation of thread size | Number of threads in 25.4 mm | Pitch | Height of thread | Diameters at gauge plane | Gauge Length (external thread) | Tolerance on position of gauge plane on internal thread | Length of external thread not less than | Fitting allowance | Diameteral tolerance on Parllel internal threads | ||||||||||
| Major (gauge diameter) | Pitch | Minor | Nominal | Tolerance ±T1/2 |
max. | min. | Tolerance ±T1/2 |
For nominal gauge length | For maximum gauge length | For minimum gauge length | |||||||||
| 2) | Turns of thread | 2) | Turns of thread | 2) | Turns of thread | ||||||||||||||
| P | h | d | d2 | d1 | |||||||||||||||
| 1/16 | 28 | 0,907 | 0,581 | 7,723 | 7,142 | 6,561 | 4 | 0,9 | 1 | 4,9 | 3,1 | 1,1 | 1 1/4 | 6,5 | 7,4 | 5,6 | 2,5 | 2 3/4 | ± 0.071 |
| 1/8 | 28 | 0,907 | 0,581 | 9,728 | 9,147 | 8,566 | 4 | 0,9 | 1 | 4,9 | 3,1 | 1,1 | 1 1/4 | 6,5 | 7,4 | 5,6 | 2,5 | 2 3/4 | ± 0.071 |
| 1/4 | 19 | 1,337 | 0,856 | 13,157 | 12,301 | 11,445 | 6 | 1,3 | 1 | 7,3 | 4,7 | 1,7 | 1 1/4 | 9,7 | 11 | 8,4 | 3,7 | 2 3/4 | ± 0.104 |
| 3/8 | 19 | 1,337 | 0,856 | 16,662 | 15,806 | 14,950 | 6,4 | 1,3 | 1 | 7,7 | 5,1 | 1,7 | 1 1/4 | 10,1 | 11,4 | 8,8 | 3,7 | 2 3/4 | ± 0.104 |
| 1/2 | 14 | 1,814 | 1,162 | 20,955 | 19,793 | 18,631 | 8,2 | 1,8 | 1 | 10,0 | 6,4 | 2,3 | 1 1/4 | 13,2 | 15 | 11,4 | 5,0 | 2 3/4 | ± 0.142 |
| 3/4 | 14 | 1,814 | 1,162 | 26,441 | 25,279 | 25,117 | 9,5 | 1,8 | 1 | 11,3 | 7,7 | 2,3 | 1 1/4 | 14,5 | 16,3 | 12,7 | 5,0 | 2 3/4 | ± 0.142 |
| 1 | 11 | 2,309 | 1,479 | 33,249 | 31,770 | 30,291 | 10,4 | 2,3 | 1 | 12,7 | 8,1 | 2,9 | 1 1/4 | 16,8 | 19,1 | 14,5 | 6,4 | 2 3/4 | ± 0.180 |
| 1 1/4 | 11 | 2,309 | 1,479 | 41,910 | 40,431 | 38,952 | 12,7 | 2,3 | 1 | 15,0 | 10,4 | 2,9 | 1 1/4 | 19,1 | 21,4 | 16,8 | 6,4 | 2 3/4 | ± 0.180 |
| 1 1/2 | 11 | 2,309 | 1,479 | 47,803 | 46,324 | 44,845 | 12,7 | 2,3 | 1 | 15,0 | 10,4 | 2,9 | 1 1/4 | 19,1 | 21,4 | 16,8 | 6,4 | 2 3/4 | ± 0.180 |
| 2 | 11 | 2,309 | 1,479 | 59,614 | 58,135 | 56,656 | 15,9 | 2,3 | 1 | 18,2 | 13,6 | 2,9 | 1 1/4 | 23,4 | 25,7 | 21,1 | 7,5 | 3 1/4 | ± 0.180 |
| 2 1/2 | 11 | 2,309 | 1,479 | 75,184 | 73,705 | 72,226 | 17,9 | 3,5 | 1 1/2 | 21,0 | 14,0 | 3,5 | 1 1/2 | 26,7 | 30,2 | 23,2 | 9,2 | 4 | ± 0.216 |
| 3 | 11 | 2,309 | 1,479 | 87,884 | 86,405 | 84,926 | 20,6 | 3,5 | 1 1/2 | 24,1 | 17,1 | 3,5 | 1 1/2 | 29,8 | 33,3 | 26,3 | 9,2 | 4 | ± 0.216 |
| 4 | 11 | 2,309 | 1,479 | 113,030 | 111,551 | 110,072 | 25,4 | 3,5 | 1 1/2 | 28,9 | 21,9 | 3,5 | 1 1/2 | 35,8 | 39,3 | 32,3 | 10,4 | 4 1/2 | ± 0.216 |
| 5 | 11 | 2,309 | 1,479 | 138,430 | 136,951 | 135,472 | 28,6 | 3,5 | 1 1/2 | 32,1 | 25,1 | 3,5 | 1 1/2 | 40,1 | 43,6 | 36,6 | 11,5 | 5 | ± 0.216 |
| 6 | 11 | 2,309 | 1,479 | 163,830 | 162,351 | 160,872 | 28,6 | 3,5 | 1 1/2 | 32,1 | 25,1 | 3,5 | 1 1/2 | 40,1 | 43,6 | 36,6 | 11,5 | 5 | ± 0.216 |