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Everyone who deal with PC and servers assembling knows how does the screw to connect HDD with chassis (tray) looks like.

But how to name it correctly? Is it M3.5 screw or what?

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3.5" HDDs use non-metric, UTS screws: #6-32 UNC. They have #6 diameter (.138") with 32 tpi (coarse) thread.

2.5" HDDs use metric M3 screws.

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