Socket cap (the top ones) screws and a washer also work, but they stick up more so they suck underfoot.
I’d recommend getting your fasteners from a fastener supply company anyway, they have far more options and higher strength ones available. I recommend class 10.9 or 12.9.
I wasn’t gonna drop a specific supplier because none of the ones I know are in germany or closeby, but Brian’s all up in my business about it so here. The closest I know if is accu.co.uk.
Bomb a steep long hill, shit your pants when you’re almost at the end of it, doing 70km/hr with no brakes. That’s how you pass max duty cycle.
If you accelerate using the throttle it may indeed start braking, but freerolling not so much
Just make sure to pick the high tensile steel, not stainless.
They don’t have quite the range of selection that some others have, but they’re closer to you.
My other go-to supplier of all threaded things is boltdepot.com
I found it easier to just search by DIN/ISO number on most online places.
M5 ISO7380FL works well for trucks unless you want to go with the “standard” imperial skate hardware.