Metallics TP503SBC Screws 6 x 1-1/2 Btn Hx Pin TR SMS 18 (100 pcs)

The TP503SBC is a #6 x 1-1/2 inch sheet metal screw with a button head and a hex drive with a center pin, sold 100 pieces to the pack. That is the full orderable configuration under this part number, so if you need a different diameter or length you are looking at a different Metallics number.

It takes a pin-in-hex (hex socket with a center pin) tamper-resistant bit, not a plain Allen key. A standard hex bit will bottom out on the pin in the middle of the recess. Contractors doing security covers, enclosure lids, or public-area plates usually keep a pin-in-hex bit set on the truck for exactly this head style.

A pin-in-hex head keeps the public out of what you closed up. Property managers and MRO crews specify these on panel covers, exterior fixture plates, and anything in a corridor, lobby, or school where a standard Phillips or slotted screw invites a pocket knife. The trade-off is that your own techs need the matching pin drive bit, so it is worth standardizing one head style across a building rather than mixing them.

It is stocked as an electrical fastener, and the button head pin-hex sheet metal screw is a common pick for securing enclosure and device covers, trim plates, and fixture housings where you do not want them opened without the right bit. Nothing about the screw limits it to electrical work, but that is the aisle it belongs to.