is there any advantage using DIN933 bolts/screws over DIN912?
Do note the head of DIN912 is a bit higher.
E. g. in certain places theres not enough space to tighten the screws with a allen key or something like that?
Also, I have a hard time finding one of those M8 x 25mm coupling nuts in Germany (found only a 30mm so far). Should it work to just stack a bunch of common M8 nuts?
EDIT: I just figured the coupling nuts is only needed when threaded rod is used. I ordered leadscrews.