ISO 965 (ISO general purpose metric screw thread—tolerances) is an International Organization for Standardization (ISO) standard for metric screw thread tolerances. It specifies the basic profile for ISO general purpose metric screw threads (M) conforming to ISO 261.
The tolerance system refers to the basic profile in accordance with ISO 68-1. The field of application and purpose of ISO 965 can be defined as "ISO 965 specifies a tolerance system for screw threads from 1mm diameter upwards.
Limits for standard metric coarse threads according to ISO 965.
Thread size | Engagement length |
Major diameter(d) |
Pitch diameter(d2) | |||
---|---|---|---|---|---|---|
in mm | from | to | max. | min. | max. | min. |
M1 | 0.6 | 1.7 | 1.000 | 0.933 | 0.838 | 0.785 |
M1.1 | 0.6 | 1.7 | 1.100 | 1.033 | 0.938 | 0.885 |
M1.2 | 0.6 | 1.7 | 1.200 | 1.133 | 1.038 | 0.985 |
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 |
M2.2 | 1.3 | 3.8 | 2.180 | 2.080 | 1.888 | 1.817 |
M2.5 | 1.3 | 3.8 | 2.480 | 2.380 | 2.118 | 2.117 |
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 | 12 | 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 | Engagement length |
Major diameter | Pitch diameter | |||
---|---|---|---|---|---|---|
in mm | from | to | 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 | 17.732 | 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 |
The standard consists of the following parts: