Generally, no. DIN standards are copyright-protected. Unlike US government standards (e.g., Fed-Std-H28), German and ISO standards must be purchased.
However, you can access the document through the following legitimate channels: din 267 part 9 pdf
Your search for a is a sign that you are working with outdated technical data. While you can buy a historical copy for archival purposes, the smart engineering move is to download DIN EN ISO 898-2:2012 . Generally, no
A bolt is only as good as its surface. Without the specifications in DIN 267-9, a simple zinc coating could make a bolt too thick to fit its nut or leave it vulnerable to "white rust" in weeks. din 267 part 9 pdf
You will find many websites offering a free . Warning: Many of these are: