what is difference between NUT DIN7040M5 vs DIN985M5?
First of all,
There does not exist a DIN 7040
It should be ISO 7040
Both are norms according to what a product is made too.
The norms determine the size of the nut, and the mechanical properties.
DIN = Deutsche Industrie Norm
ISO = International Standardization Organization
https://anemo.eu/hardware/aes-titanium/din-985-iso-7040-uni-7473
take care:
the nut you’ve selected is a self-locking with help of a plastic ring.
This nut cannot be re-used.
If you have a heavy vibration application and want extra security, please choose:
https://www.auto-lok-nut.com/ALNdM5X080CL8