ISO 965
{{Short description|ISO standard}}
ISO 965 (ISO general purpose metric screw thread—tolerances) is an International Organization for Standardization (ISO) standard for metric screw thread tolerances.{{cite web|url=http://www.iso.org/iso/home/store/catalogue_ics/catalogue_detail_ics.htm?csnumber=57778|title=ISO general purpose metric screw threads -- Tolerances -- Part 1: Principles and basic data|publisher=International Organization for Standardization|date=13 September 2013|access-date=10 January 2017}} It specifies the basic profile for ISO general purpose metric screw threads (M) conforming to ISO 261.{{Cite web |url=http://www.standardsmalaysia.gov.my/3-Mechanical%20Systems.pdf |title=Malaysian Standard, Sectorial Catalogue, Mechanical Systems & Components-Source-Government of Malaysia |access-date=2010-08-24 |archive-url=https://web.archive.org/web/20091229025924/http://www.standardsmalaysia.gov.my/3-Mechanical%20Systems.pdf |archive-date=2009-12-29 |url-status=dead }}
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.[https://books.google.com/books?id=qq3IdWd1vQkC&q=ISO+965&pg=PA22] 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
Thread tolerances
Limits for standard metric coarse threads according to ISO 965.[https://web.archive.org/web/20060303110831/http://www.fullermetric.com/technical/information/tech_thread_tolerance.htm] Limits for Metric (standard) Coarse Threads according to ISO 965
| class="wikitable" style="text-align: right"
! Thread size !! colspan="2" | Engagement |
| in mm || from || to || max. || min. || max. || min. |
|---|
| style="text-align: left" | M1
| 0.6 || 1.7 || 1.000 || 0.933 || 0.838 || 0.785 |
| style="text-align: left" | M1.1
| 0.6 || 1.7 || 1.100 || 1.033 || 0.938 || 0.885 |
| style="text-align: left" | M1.2
| 0.6 || 1.7 || 1.200 || 1.133 || 1.038 || 0.985 |
| style="text-align: left" | M1.4
| 0.7 || 2 || 1.400 || 1.325 || 1.205 || 1.149 |
| style="text-align: left" | M1.6
| 0.8 || 2.6 || 1.581 || 1.496 || 1.354 || 1.291 |
| style="text-align: left" | M1.8
| 0.8 || 2.6 || 1.781 || 1.696 || 1.554 || 1.491 |
| style="text-align: left" | M2
| 1 || 3 || 1.981 || 1.886 || 1.721 || 1.654 |
| style="text-align: left" | M2.2
| 1.3 || 3.8 || 2.180 || 2.080 || 1.888 || 1.817 |
| style="text-align: left" | M2.5
| 1.3 || 3.8 || 2.480 || 2.380 || 2.118 || 2.117 |
| style="text-align: left" | M3
| 1.5 || 4.5 || 2.980 || 2.874 || 2.655 || 2.580 |
| style="text-align: left" | M3.5
| 1.7 || 5 || 3.479 || 3.354 || 3.089 || 3.004 |
| style="text-align: left" | M4
| 2 || 6 || 3.978 || 3.838 || 3.523 || 3.433 |
| style="text-align: left" | M5
| 2.5 || 7.5 || 4.976 || 4.826 || 4.456 || 4.361 |
| style="text-align: left" | M6
| 3 || 12 || 5.974 || 5.794 || 5.324 || 5.212 |
| style="text-align: left" | M7
| 3 || 3 || 6.974 || 6.794 || 6.324 || 6.212 |
| style="text-align: left" | M8
| 4 || 12 || 7.972 || 7.760 || 7.160 || 7.042 |
| style="text-align: left" | M10
| 5 || 15 || 9.968 || 9.732 || 8.994 || 8.862 |
| style="text-align: left" | M12
| 6 || 18 || 11.966 || 11.701 || 10.829 || 10.679 |
| style="text-align: left" | M14
| 8 || 24 || 13.962 || 13.682 || 12.663 || 12.503 |
| style="text-align: left" | M16
| 8 || 24 || 15.962 || 15.682 || 14.663 || 14.503 |
| style="text-align: left" | M18
| 10 || 30 || 17.958 || 17.623 || 16.334 || 16.164 |
| style="text-align: left" | M20
| 10 || 30 || 19.958 || 19.623 || 18.334 || 18.164 |
| style="text-align: left" | M22
| 10 || 30 || 21.958 || 21.623 || 20.334 || 20.164 |
| style="text-align: left" | M24
| 12 || 36 || 23.952 || 23.577 || 22.003 || 21.803 |
| style="text-align: left" | M27
| 12 || 36 || 26.952 || 26.577 || 25.003 || 24.803 |
| style="text-align: left" | M30
| 15 || 45 || 29.947 || 29.522 || 27.674 || 27.462 |
| style="text-align: left" | M33
| 15 || 45 || 32.947 || 32.522 || 30.674 || 30.462 |
| style="text-align: left" | M36
| 18 || 53 || 35.940 || 35.465 || 33.342 || 33.118 |
| style="text-align: left" | M39
| 18 || 53 || 38.940 || 38.465 || 36.342 || 36.118 |
Limits for metric fine threads according to ISO 965:
| class="wikitable" style="text-align: right" | |||
| Thread Size | colspan="2" | Engagement length | colspan="2" | Major diameter | colspan="2" | Pitch diameter |
|---|---|---|---|
| in mm || from || to || max. || min. || max. || min. | |||
| style="text-align: left" | M8x1
| 3 || 9 || 7.974 || 7.794 || 7.324 || 7.212 | |||
| style="text-align: left" | M10x1.25
| 4 || 12 || 9.972 || 9.760 || 9.160 || 9.042 | |||
| style="text-align: left" | M12x1.25
| 4.5 || 13 || 11.972 || 11.760 || 11.160 || 11.028 | |||
| style="text-align: left" | M14x1.5
| 5.6 || 16 || 13.968 || 13.732 || 12.994 || 12.854 | |||
| style="text-align: left" | M16x1.5
| 5.6 || 16 || 15.968 || 15.732 || 14.994 || 14.854 | |||
| style="text-align: left" | M18x1.5
| 5.6 || 16 || 17.968 || 17.732 || 16.994 || 16.854 | |||
| style="text-align: left" | M20x1.5
| 5.6 || 16 || 19.968 || 19.732 || 18.994 || 18.854 | |||
| style="text-align: left" | M22x1.5
| 5.6 || 16 || 21.968 || 21.732 || 20.994 || 20.854 | |||
| style="text-align: left" | M24x2
| 8.5 || 25 || 23.962 || 23.682 || 22.663 || 22.493 | |||
| style="text-align: left" | M27x2
| 8.5 || 25 || 26.962 || 26.682 || 25.663 || 25.493 | |||
| style="text-align: left" | M30x2
| 8.5 || 25 || 29.962 || 29.682 || 28.663 || 28.493 | |||
| style="text-align: left" | M33x2
| 8.5 || 25 || 32.962 || 32.682 || 31.663 || 31.493 | |||
| style="text-align: left" | M36x3
| 12 || 36 || 35.952 || 35.577 || 34.003 || 33.803 | |||
| style="text-align: left" | 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