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What is the difference between screws, bolts and studs, and what is the difference in appearance?

Screws? Generally refers to small screws with a thread diameter of 10mm, generally have a head, head slotted

Bolt? Generally refers to the thread diameter of 10mm or more large screws, generally have a head, the head has a slot type

Studs: no thread size regulations, but no head, there is no slot type, but specifically divided into double studs and full-threaded bars.

Specifically look at the picture: black? No head is the stud, of course, ah is one of them, white is the bolt, because the size is larger.

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