Um, machine screws tend to be fastened with a screwdriver, while bolts tend to have a nut and be fastened with a wrench.
This leaves open what to call a fastener that uses an allen wrench - most common is capscrew, but bolt is also used.
Real quick JIS explanation from a motorcycle guy:
https://www.youtube.com/watch?v=VpqUhIZ-EJoThe VESSEL JIS +2 screwdriver is $10 from Amazon.
https://www.amazon.com/gp/product/B000TG8OTY/When I discovered JIS and bought a JIS +2 screwdriver, adjusting derailleurs and B-screws became a WHOLE lot easier.
And, yes, there’s a dot on their heads - you just have to look close for it.
aero (mechanical engineer) perf