Thanks for the speedy response!
That is great information and will help me solve this issue I am having.
I guess should explain the complete issue:
Have MSI Z170a M7 motherboard https://us.msi.com/Motherboard/Z170A-GAMING-M7.html#hero-overview
Put a Samsung 950 Pro in it.
Ordered a cover (already a questionable concept due to heat) http://www.coldzero.eu/m2-covers/2590-m2-cover-msi-dragon.html
Can't use original screw because off the thickness of the cover.
The screw that came with it is too large for the stand-off the motherboard came with. The threads seem to match the stand-off itself but not the screw that goes into the stand-off. So now I am debating finding a new screw for the stand-off or just re-tapping the stand-off to fit the screw that I have.