Metallics TP222SFC Screws 6-32 x 1/4 FH Star Pin TR MS 18-8 (100 pcs)

The TP222SFC is a star pin (Torx-style with a center pin) tamper-resistant machine screw, so a standard Torx bit will not seat. You need a pin-in-star bit, which is a Torx driver with a hole bored down the center to clear the pin in the recess. Standard screwdrivers, Phillips and plain hex keys will not turn it, which is the point of the head.

Made of 18-8 stainless steel, which is the 300-series austenitic grade used for general corrosion resistance. That makes it suitable for damp, washdown and typical outdoor exposure where a plated carbon steel screw would rust. For salt spray or coastal exposure, 18-8 is the lower tier of stainless; 316 is the grade specified for that duty.

Yes, if the hole is countersunk. The TP222SFC has a flat head, which is a conical head meant to drop into an 82-degree countersink and finish flush with the face of the part. Into a plain drilled or punched hole with no chamfer, the head will stand proud and may not seat squarely. If you need a head that bears on a flat, unprepared surface, specify a pan or truss head instead.

The point is to stop casual access. A pin-in-star recess cannot be turned with anything in a common pocket tool kit, so covers, device plates and enclosure doors in public corridors, schools, transit areas and detention or behavioral health spaces stay closed until someone with the matching bit opens them. The trade-off is that your own crews need the special driver on the truck, so most facilities standardize on one tamper head across the building rather than mixing types.

Each pack is 100 pieces of the 6-32 x 1/4 inch tamper-resistant flat head stainless screw, ordered under part number TP222SFC. That quantity suits securing a run of covers or plates across a building rather than a single device, which is usually how security screws get bought.