![]() The M3 threaded holes are often found on 5.25" optical disc drives, 3.5" floppy drives, and 2.5" drives. The #6-32 UNC screws are often found on 3.5" hard disk drives and the case's body to secure the covers. In turn, these thread standards define preferred size combinations that are based on generic units-some on the inch and others on the millimetre. The Unified Thread Standard (UTS) originates from the United States, while the ISO metric screw thread is standardized worldwide. Although there are numerous manufacturers of computer cases, they have generally used three thread sizes. From left to right: a #6-32 UNC thumbscrew, a #6-32 UNC screw, an M3 screw and a self-tapping screw for case fansĬomputer case screws are the hardware used to secure parts of a PC to the case.
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