Captive panel screw

Manufacturer specific - PEM PF11/PF12/PF15, Southco (no ISO/DIN)

Sizes

M2-M6 and #2-56 to 1/4-20

Drive & head

Slotted, Phillips, hex or knurled knob

Materials

Steel with zinc or black oxide, stainless

Strength / grades

Commercial grade, not strength classed

Hole and pilot guidance

The mounting hole follows the maker's datasheet - press-fit, flare-mount and floating types all use different holes.

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Server and rack chassis panels

The screw stays trapped in the panel so it cannot be dropped or lost during service

Electronics enclosure lids

Pressed into sheet metal for covers that get opened repeatedly

Panel thickness must be inside the stated range or the fastener will not stay clinched.
Clinch, flare and floating versions are not interchangeable in the same hole.
The retaining spring wears out after many cycles.