I have the unfortunate task of writing a technical document, and I know the government is a stickler for unnecessary detail. Is there standard name for the standard computer screw? Also, what is the name of the standard disk drive screw?
The other common screw type is the metric M3-0.50 screw, which are used for mounting optical drives, floppy drives, and the motherboard.
To make it harder, there are also computer cases that ship with motherboard standoffs that accept imperial screws, not M3.
It's amusing that both imperial and metric screws are used in each computer, and rather annoying that these screws are fairly similar in size (although not in threading). This means that an M3 screw will fit in a 6-32 hole, and will even seem to screw in, but it won't stay in place well. A 6-32 screw will go in an M3 hole if you try hard enough, which results in stripping.
Note that the self-tapping plastic screws used exclusively for fans and some lighting are also standardized, although they're just standardized within industry as "self-tapping plastic screws" rather than being a standard mechanical screw size.
6-32, and M3.
Here are the specs for most computer screws (Laptops are different)
Just Google "Computer Screw Set" and you will find kits that have everything you need.
Any special screws will come with the hardware you purchase.
Main board conventional copper column (M3 x 6 + 6)
Main board fixed screws (M3 x 5)
Main board insulation gasket (red M3 x 8)
CD-ROM set screws (M3 x 4)
Hard drive screw (M3.5 x 5)
Chassis hand twist screws (silver M3.5 x 5)
Chassis hand twist screw (black M3.5 x 5)
Chassis high-strength screw (M3.5 x 6)
Conventional chassis fan retaining screw (white zinc M5 x 10)
Conventional chassis fans retaining screw (black M5 x 10)
One thing not mentioned here is about #4-40 and optical drives. I haven't looked into screw sizes for many years, but I ran into this fact many years ago, i'm not sure to what extent it apples nowadays. It may still apply.
It's mentioned here
"Actually optical drives don't use the same 6-32 screws that everything else does. Most of them use M3x5, 0.5mm pitch screws, some use #4-40 screws."