Metallics TP517SBC Screws 14 x 1-1/4 Btn Hx Pin TR SMS 1 (100 pcs)

The Metallics TP517SBC is a #14 x 1-1/4 inch sheet metal screw with a button head and a pin-in-hex (tamper-resistant) drive. The pin in the center of the hex socket means a standard hex key will not turn it, so you need a matching pin-in-hex driver bit.

No. The TP517SBC uses a pin-in-hex socket, which has a post standing in the middle of the hex recess. A solid hex key bottoms out on that pin and will not seat. You need a pin-in-hex (hollow center) bit sized to the screw to install or remove it.

Each pack holds 100 pieces of the #14 x 1-1/4 inch pin-in-hex button head screw. That is the standard order unit, so a job needing a few hundred fasteners is ordered in multiples of 100.

A #14 x 1-1/4 inch self-tapping sheet metal screw is a sheet-metal thread fastener, so it cuts its own thread in enclosure sheet steel, strut, covers and panels. The pin-in-hex button head is specified where the fastener has to resist casual removal, for example enclosure covers, panel lids, fixture guards and exposed hardware in public or tenant-accessible spaces.

It is a button head, so it sits proud of the surface with a low rounded dome rather than countersinking flush. If the application needs the fastener to finish flat with the panel face, a flat head tamper-resistant screw with a countersunk hole is the right choice instead.

With a 1-1/4 inch overall length under a button head, usable thread is the full 1-1/4 inches, so the combined thickness of the part being fastened plus the thread engagement in the base material has to fall inside that. For sheet steel enclosures and strut that is ample; for fastening through thick cover plates or into deep framing, step up to a longer length.