These are replacement hex nuts for various computer ports such as a monitor or printer. The nut dimensions are

CableWholesale's Hex Nut, # 4 - 40, 100 Pieces, 5.0mm

These are replacement hex nuts for various computer ports such as a monitor or printer. The nut dimensions are 5.0mm.

CableWholesale's Hex Nut Jack Screw, 100 Pieces, # 4 - 40, 17.08mm

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CableWholesale's Hex Nut, # 4 - 40, 100 Pieces, 5.0mm