[quote]
The 6-32 is a UTS screw with a major thread diameter of 0.1380 inches (3.5052 millimetres) and a tpi (threads per inch, imperial threads) of 32 tpi, so the threads of the screws are 0.79375 millimetres apart. It is by far the most common screw found inside computer cases[1] and commonly appears in lengths of 0.15 and 0.25 in. 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 3.5 in 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.[/quoute]
