Я вижу все больше и больше этих винтов (на фото ниже), которые почти треугольные. Я нахожу, что я могу помещать их только в блоки питания и карты PCI (e) в случаях, но они сломаются / оторвутся, если я положу их на жесткий диск или в стойку для материнской платы
Заметьте треугольную форму на нем? В чате Root Access я начал спрашивать, но конкретного ответа пока нет. Я не предполагаю, что это производственный недостаток, так как я видел сотни и заменил их «правильными» круглыми винтами. Это грубая, а не тонкая (например, для привода DVD или дисковод гибких дисков). Для чего они нужны и зачем они нам нужны вместо обычных круглых?
The screw has a triangular cross-section to the threads because that's a technique used for many "self-tapping" screws. They are designed to be driven into an unthreaded hole and form a thread as they are driven -- the shape helps "form" the threads vs just cutting them.
They may occur with any thread pitch, but generally the shorter ones will have a relatively coarse thread, since they'd designed to be driven rapidly (with a power screwdriver on an assembly line) into sheet-metal.
I've seen tons of these over the years building computers, they are often shipped as chassis screws (for panels, power supplies, expansion slot cover plates, etc.)
And you're right, using them in a hard drive can wreck the threads pretty well if it's slightly out of alignment when screwed in, but based on the ones I've seen supplied with computer chassis they are the right/same threading.
Basically they work well (enough) for sheet metal fastening but for softer metals like aluminum you're better off using more precise, round-shafted screws.
The shaft shape is basically a Reuleaux triangle ('The shape, other than a circle, a manhole cover be made so that it cannot fall down through the hole').
As @sawdust points out in his comment, and now @DanielRHicks in his answer, they appear to be self-tapping screws intended for machine/assembly line usage.
I've personally used them as a substitute, ghetto tap because I felt they we're cheap, we usually had buckets of screws around the shop, and I'd rather destroy them instead of better screws (which would be used to finally fasten whatever I was making the hole for). :)
Looks like a TP3 style screw head (rounded triangle) and looks to have seen better days.
It is a type of proprietary/security screw head to keep the common folk from removing them. With the proper driver they are much like any other screw. Commonly see on Nintendo, Gameboy; Fast Food promotional toys and video games; Die-cast toys; Roomba battery packs (ref: Wikipedia)
Image from www.hudsonfasteners.com which also offers a TP3 bit.