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Class 04 (very soft nuts) is no longer recognized in ISO standards. If your old drawing calls for DIN 267-9 Class 04, you must use Class 4 today.
Details the duration and conditions for standard testing (like salt spray tests) to prove adequate protection against rust. din 267 part 9 pdf
Disclaimer: This article is for informational purposes only and does not constitute legal or engineering advice. Always refer to the complete, current official standard for product compliance. Class 04 (very soft nuts) is no longer
DIN 267 Part 9 (or DIN 267-9) defines the technical delivery conditions for mechanical fasteners with electroplated coatings din 267 part 9 pdf
The fasteners shall be subjected to testing to verify their mechanical properties and dimensional accuracy.
