# DIN 963 · M3 · dk max. — Sizes where a DIN fastener and its ISO equivalent are not interchangeable

For DIN 963, size is M3; dimension that differs is dk max; iso standard is ISO 2009; din value is 5.6; iso value is 5.5, verified against its source on 2026-10-12.

- **DIN standard:** DIN 963 _(verified: appears in the quote below)_
- **ISO standard:** ISO 2009 _(verified: appears in the quote below)_
- **Size:** M3 _(verified: appears in the quote below)_
- **Dimension that differs:** dk max. _(verified: appears in the quote below)_
- **DIN value:** 5.6 _(verified: appears in the quote below)_
- **ISO value:** 5.5 _(verified: appears in the quote below)_

## What the source says

**ISO standard, DIN value and ISO value:** The source prints these values inside the passage below but does not name them there. The passage shows where each one appears; what ties them to this record is the position on the page, not anything the passage says.

> Thread M1.6 M2 M2.5 M3 M3.5 M4 M5 M6 M8 M10 ISO 7045 3.2 4 5 5.6 7 8 9.5 12 16 20 dk max. DIN 7985 3.2 4 5 6 7 8 10 12 16 20 ISO 7045 1.3 1.6 2.1 2.4 2.6 3.1 3.7 4.6 6 7.5 kmax. DIN 7985 1.3 1.6 2 2.4 2.7 3.1 3.8 4.6 6 7.5 ISO 7046-Part 1 + 2* 3 3.8 4.7 5.5 7.3 8.4 9.3 11.3 15.8 18.3 dk max. DIN 965 3 3.8 4.7 5.6 6.5 7.5 9.2 11 14.5 18 ISO 7046-Part 1 + 2* 1 1.2 1.5 1.65 2.35 2.7 2.7 3.3 4.65 5 kmax. DIN 965 0.96 1.2 1.5 1.65 1.93 2.2 2.5 3 4 5 ISO 7047 3 3.8 4.7 5.5 7.3 8.4 9.3 11.3 15.8 18.3 dk max. DIN 966 3 3.8 4.7 5.6 6.5 7.5 9.2 11 14.5 18 ISO 7047 1 1.2 1.5 1.65 2.35 2.7 2.7 3.3 4.65 5 kmax. DIN 966 0.96 1.2 1.5 1.65 1.93 2.2 2.5 3 4 5 ISO 2009 3 3.8 4.7 5.5 7.3 8.4 9.3 11.3 15.8 18.3 dk max. DIN 963 3 3.8 4.7 5.6 6.5 7.5 9.2 11 14.5 18

## Source

- https://www.wurthindustry.ca/media/downloads/wic_pdfs/Fasteners_DIN-EN-ISO_Standards.pdf

Last verified: 2026-10-12. Review by: 2029-10-11.
Part of [Sizes where a DIN fastener and its ISO equivalent are not interchangeable](https://referencesource.org/fastener-standard-interchangeability-exceptions/).