ISO 965
ISO 965 (ISO general purpose metric screw thread—tolerances) is an International Organization for Standardization (ISO) standard for metric screw thread tolerances.[1] It specifies the basic profile for ISO general purpose metric screw threads (M) conforming to ISO 261.[2]
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.[3]
Thread tolerances
Limits for standard metric coarse threads according to ISO 965.[4]
| 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 |
Parts
The standard consists of the following parts:
- ISO 965-1 Principles and basic data
- ISO 965-2 Limits of sizes for general purpose external and internal screw threads – Medium quality
- ISO 965-3 Deviations for constructional screw threads
- ISO 965-4 Limits of sizes for hot-dip galvanized external screw threads to mate with internal screw threads tapped with tolerance position H or G after galvanizing
- ISO 965-5 Limits of sizes for internal screw threads to mate with hot-dip galvanized external screw threads with maximum size of tolerance position h before galvanizing
References
- "ISO general purpose metric screw threads -- Tolerances -- Part 1: Principles and basic data". International Organization for Standardization. 13 September 2013. Retrieved 10 January 2017.
- "Malaysian Standard, Sectorial Catalogue, Mechanical Systems & Components-Source-Government of Malaysia" (PDF). Archived from the original (PDF) on 2009-12-29. Retrieved 2010-08-24.
- ISO 965 Application as described in the Book "Transactions of Technical Conference on Metric Mechanical Fasteners, Part 3"-Source-Google Books-Published by American National Standards Institute Inc, New york
- Limits for Metric (standard) Coarse Threads according to ISO 965
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