M3 Screw
This screw is the second most common screw found in PCs. It is a metric screw, and just about every case manufacturer provides a package of M3 screws as well as 6-32s. Specifically, the screw type is M3-0.50, and the '0.50' indicates that the screw threads are 0.50 millimetres apart, which is much finer than the 1/32 in (0.79375 mm) pitch of 6-32 screws, and so more suitable for fastening thinner materials. Like the 6-32 screws, these screws also typically accept a #2 size Phillips screwdriver tip.
M3 screws are used for securing optical disc drives and floppy drives.
Of all the screws provided with PCs, M3s are usually identified by them having the finest thread pitch of all the screws provided.
Read more about this topic: Computer Case Screws
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