Metallics TP511SBC Screws 10 x 1-1/4 Btn Hx Pin TR SMS 1 (100 pcs)

The Metallics TP511SBC is a #10 x 1-1/4 inch sheet metal screw with a button head and a pin-in-hex tamper-resistant socket. It comes 100 pieces to a pack, so one pack covers a decent run of cover plates or enclosure lids without reordering.

A pin-in-hex (also called pin-hex or hex-pin) security bit in the matching size. A standard hex key will not seat because there is a pin in the center of the socket. If your crew does not already carry security bits, order them with the screws, since no driver is included with the 100-piece pack.

The point is keeping the public out. A #10 pin-in-hex screw like the TP511SBC can only be removed with a matching security bit, which is what you want on junction box covers, device plates, and enclosure panels in schools, transit areas, restrooms, or anywhere exposed to tenants and foot traffic. For back-of-house work where nobody is picking at the cover, a standard Phillips SMS is cheaper and faster to drive.

That is what a sheet metal screw thread is cut for. The 1-1/4 inch length gives plenty of thread past typical enclosure gauge sheet, so it also works where you are going through a cover plus a gasket or a spacer. If you are only fastening through two thin layers of sheet, a shorter #10 leaves less protruding point behind the panel.

Button head screws sit on top of the surface, not flush. The TP511SBC has a low, rounded head with a broad bearing surface that spans the hole, so it suits unprepped round holes in covers and panels. If you need a flush face, you want a countersunk flat head in a countersunk hole instead, not this one.

Order by the Metallics part number TP511SBC. That designation pins down the #10 x 1-1/4 inch size, the button head, the pin-in-hex tamper-resistant recess, and the sheet metal thread, so the replacements match the existing heads and take the same security bit your maintenance staff already carries.