Quote:
Originally Posted by artdutra04
In addition to being used in softer materials, coarse threads are also used when you want to quickly (dis)assemble something, as you have less threads per inch to rotate your nut/bolt. Fine threads are used in higher strength applications, as well as when you are going through something thin.
As for some screws being offered in some sizes and not in others, it depends on material strength and application. Using stainless for a fine threaded screw makes sense, because many of the applications where you would a fine threaded screw also need/benefit from stainless steel hardware.
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Most of the stainless steel that I've worked with and/or sold is mostly coarse threaded. Take the screw size 10, for example. It comes in two "standard" sizes: 10-24 and 10-32. Both are used as much as the other, but 10-24 (coarse thread) are the most widely used in stainless steel. Don't get me wrong, they make all sizes in stainless steel, it's just more difficult to find some of them.
Chrome on the other hand... well, let's not go there, it's just pretty stainless steel.