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Computer case screws are the hardware used to secure parts of a PC to the case. Although there are numerous manufacturers of computer cases, they have generally used three thread sizes. The Unified Thread Standard (UTS) originates from the United States while the ISO metric screw thread is standardized worldwide. In turn, these thread standards define preferred size combinations that are based on generic units—some on the inch and others on the millimeter. The 6-32 screws are often found on hard disk drives and the case's body to secure the covers. The M3 threaded holes are often found on optical disc drives and floppy drives. On older Serial, Parallel and VGA and DVI cables, 4-40 thumb screws are often found on the ends. More modern cases from certain manufacturers (Dell, Gateway) and enthusiast cases will lack screws altogether, instead utilizing a tool-less design. == 6-32 screw == The 6-32 is a UTS screw with a major thread diameter of () and a tpi (threads per inch, imperial threads) of , so the threads of the screws are apart. It is by far the most common screw found inside computer cases〔Rutter, Daniel ''(Dan's Data - Letters 53 ), "Screwed"'', 2006-02-26〕 and commonly appears in lengths of 0.15 and . Nearly every brand new computer case comes with a bag of these. They are used: * To secure a power supply to the case * To secure a hard disk drive to the case * To hold an expansion card in place by its metal slot cover * To fasten case components to one another * Usually, a 6-32 screw holds the main cover on the case. They are almost always provided with a Phillips drive, accepting a #2 size tip (the larger of the two most common Phillips screwdriver tips). Sometimes a Torx drive is used instead. Both Phillips and Torx patterns may also be combined with a slot for a plain flat-blade screwdriver. Usually they are provided with a hex head which accepts a 6mm AF spanner. Less frequently, they have a ''pan head'' - a low disk with a chamfered outer edge. Because they are used in places where high torque is not required and easy removal and replacement may be desirable (such as on the side panels of the PC case), they are frequently available as thumbscrews with larger, knurled heads that can be removed with one's fingers or tools. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Computer case screws」の詳細全文を読む スポンサード リンク
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