Difference in DIN 933 10.9k and A325 10.9k

ASTM A 325 is a structural bolt standard., You should order a copy and have it vetted by a competent engineer. It has mechanical property minima. See also ASTM A 490.

http://aero-defense.ihs.com/document/abstract/AKOCGBAAAAAAAAAA

DIN 933 is obsolete. it did not have mechanical properties as I recall, it was dimensional only for hex cap screws. replaced by iso4017. this is not an area for amateurs.

10.9 describes material type. I will not share mechanical properties. You can find the 10.9 properties in ISO 898-1 or ASTM A490.

When you don't ask the right questions, it is dangerous for you to be given data to play with. Buy the specs. Getting and giving free engineering advice is dangerous when the knowledge of the requester is not apparent.

get professional help.

milo