Thread Tolerances for Screws and Nuts
For Screws and Nut Threads
Limits of Sizes for Bolt & Nut Threads
| Reference No.: ISO 965/1-1980, ISO 965/2-1980 | |
| COARSE AND FINE THREAD SERIESTOLERANCE DESIGNATION | |
| BOLT THREADS6 h for sizes up to M 1, 4
6 g for sizes M 1, 6 and larger |
NUT THREADS5 H for sizes upto M 1, 4
6 H for sizes M 1, 6 and larger |
| Note : Tolerances apply to the threads before coating. After coating the actual thread profile shall not exceed the maximum tolerance H or h limits. Thin (electroplate-type) coating may be acceptable. | |
Limits for Metric (standard) Coarse Threads According To ISO 965
| Thread Size in mm | Engagement Length | Major Diameter(d) | Pitch Diameter(d2) | |||
|---|---|---|---|---|---|---|
| from | to | max. | min. | max. | min. | |
| M1 | 0,6 | 1,7 | 1,000 | 0,933 | 0,838 | 0,785 |
| M1.2 | 0,6 | 1,7 | 1,200 | 1,133 | 0,938 | 0,885 |
| M1.4 | 0, 7 | 2 | 1,400 | 1,325 | 1,205 | 1,149 |
| M1.6 | 0, 8 | 2, 6 | 1,581 | 1,496 | 1,354 | 1,291 |
| M1.8 | 0, 8 | 2, 6 | 1,781 | 1,696 | 1,554 | 1,491 |
| M2 | 1 | 3 | 1,981 | 1,886 | 1,721 | 1,654 |
| M2.5 | 1, 3 | 3, 8 | 2,480 | 2,380 | 1,888 | 1,817 |
| M3 | 1, 5 | 4, 5 | 2,980 | 2,874 | 2,655 | 2,580 |
| M3.5 | 1, 7 | 5 | 3,479 | 3,354 | 3,089 | 3,004` |
| M4 | 2 | 6 | 3,978 | 3,838 | 3,523 | 3,433 |
| M5 | 2, 5 | 7, 5 | 4,976 | 4,826 | 4,456 | 4,361 |
| M6 | 3 | 9 | 5,974 | 5,794 | 5,324 | 5,212 |
| M7 | 3 | 3 | 6,974 | 6,794 | 6,324 | 6,212 |
| M8 | 4 | 12 | 7,972 | 7,760 | 7,160 | 7,042 |
| M10 | 5 | 15 | 9,968 | 9,732 | 8,994 | 8,862 |
| M12 | 6 | 18 | 11,966 | 11,701 | 10,829 | 10,679 |
| M14 | 8 | 24 | 13,962 | 13,682 | 12,663 | 12,503 |
| M16 | 8 | 24 | 15,962 | 15,682 | 14,663 | 14,503 |
| M18 | 10 | 30 | 17,958 | 17,623 | 16,334 | 16,164 |
| M20 | 10 | 30 | 19,958 | 19,623 | 18,334 | 18,164 |
| M22 | 10 | 30 | 21,958 | 21,623 | 20,334 | 20,164 |
| M24 | 12 | 36 | 23,952 | 23,577 | 22,003 | 21,803 |
| M27 | 12 | 36 | 26,952 | 26,577 | 25,003 | 24,803 |
| M30 | 15 | 45 | 29,947 | 29,522 | 27,674 | 27,462 |
| M33 | 15 | 45 | 32,947 | 32,522 | 30,674 | 30,462 |
| M36 | 18 | 53 | 35,940 | 35,465 | 33,342 | 33,118 |
| M39 | 18 | 53 | 38,940 | 38,465 | 36,342 | 36,118 |
Limits For Metric Fine Threads According To ISO 965
| Thread Size in mm | Length of Thread engagement | MAJOR DIAMETER | PITCH DIAMETER | |||
|---|---|---|---|---|---|---|
| over | up to and incl. | max. | min. | max. | min. | |
| M8x1 | 3 | 9 | 7,974 | 7,794 | 7,324 | 7,212 |
| M10x1.25 | 4 | 12 | 9,972 | 9,760 | 9,160 | 9,042 |
| M12x1.25 | 4, 5 | 13 | 11,972 | 11,760 | 11,160 | 11,028 |
| M14x1.5 | 5, 6 | 16 | 13,968 | 13,732 | 12,994 | 12,854 |
| M16x1.5 | 5, 6 | 16 | 15,968 | 15,732 | 14,994 | 14,854 |
| M18x1.5 | 5, 6 | 16 | 17,968 | 17,762 | 16,994 | 16,854 |
| M20x1.5 | 5, 6 | 16 | 19,968 | 19,732 | 18,994 | 18,854 |
| M22x1.5 | 5, 6 | 16 | 21,968 | 21,732 | 20,994 | 20,854 |
| M24x2 | 8, 5 | 25 | 23,962 | 23,682 | 22,663 | 22,493 |
| M27x2 | 8, 5 | 25 | 26,962 | 26,682 | 25,663 | 25,493 |
| M30x2 | 8, 5 | 25 | 29,962 | 29,682 | 28,663 | 28,493 |
| M33x2 | 8, 5 | 25 | 32,962 | 32,682 | 31,663 | 31,493 |
| M36x3 | 12 | 36 | 35,952 | 35,577 | 34,003 | 33,803 |
| M39x3 | 12 | 36 | 38,952 | 38,577 | 37,003 | 36,803 |
All information is strictly informative