Yep , I guess I'll concede to machine screws. To me if it has a nut it's a bolt.
Now that we are on topic of screws , I feel very badly for our US neighbors. If you only had the opportunity to use one Robertson screw in your life you would never go back to a Phillips head screw again. Robertson screws are not infallible but they are at least 1000 times a better head than Phillips.
Us Canadians hear that the only reason the US does not move over to the Robertson head is because it's a Canadian invention (just hear say) but for what ever the reason, I feel sorry for you every time I work on an aircraft. I use Phillips on my aircraft because they are aircraft certified, I'm sure Robertson head screws could be made to the same mil spec.
At work we routinely (and I'm very serious here) through out all the Phillips screws that come with components and replace them with Robertson, they are just that much better.