Why can’t we just figure out what screw -head- shape is the best and always use that. It seems pointless to have hundreds of different screw types for very similar things. Obviously this is excluding things like lug nuts or anything heavy duty.
Edit:specifying screw heads, not the threads or shape.
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So, there’s actually a bunch of reasons!
Money is a big one.
Material is another. Screws can be made of plastic, steel, brass, stainless steel, copper, etc.
Size, is a factor.
Torque is a big one. Each of the screw designs you’re thinking of can handle a different amount of twisting force.
Head geometry. Beyond the type of driver, screws have different shapes. Pan head, flat head (countersunk), socket head, hex head, oval head.
Appearance – sometimes the designer just wants a certain look. If many screws would technically do the job, they could choose the one that is most esthetically pleasing.
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