Metallics TP231SFC Screws 10-32 x 3/4 FH Star Pin TR MS 18-8 (100 pcs)

It's a 10-32 x 3/4 inch machine screw, so #10 diameter with 32 threads per inch and a 3/4 inch length. Being a machine screw thread rather than a sheet metal or wood thread, it mates with a tapped hole or a 10-32 nut, which is the common thread for device boxes, enclosure covers and panel work.

Star Pin TR is a tamper-resistant six-lobe (Torx-style) recess with a solid pin standing up in the center of the drive. A standard Torx bit will not seat on it. You need a pin-in-Torx (Torx-PIN) driver of the matching size, which has a hole bored down its center to clear the pin. That's the point of the design: it keeps the public and unauthorized staff out of covers and enclosures in schools, transit, detention and other high-traffic facilities.

The TP231SFC is 18-8 stainless steel, the austenitic 300-series grade (roughly 18 percent chromium, 8 percent nickel) used for general corrosion resistance. That makes it suitable for damp and exterior locations where a plated carbon steel screw would rust and seize, which matters a lot on tamper-resistant hardware you may need to remove years later. For salt-spray coastal exposure, 316 stainless is the step up.

Only if the hole is countersunk. FH means flat head, which has a cone-shaped underside that needs a matching 82-degree countersink in the plate or enclosure flange to finish flush. On a plain punched hole with no countersink the head will stand proud and may rock. If your plate has straight-walled holes, you want a pan or truss head instead.

Yes, that's exactly what it is: a tamper-resistant stainless machine screw sold for electrical work. The combination of a 10-32 thread, a pin-in-star drive and 18-8 stainless is the standard replacement for the ordinary slotted 6-32 or 10-32 screws that ship with covers, where you want the cover to stay on. Confirm your hole is tapped 10-32 and not 6-32 before you order, since the two are not interchangeable.

One pack is 100 pieces, ordered under part number TP231SFC. For a property manager or MRO buyer standardizing on tamper-resistant fasteners across a building, that's roughly enough to do a few hundred cover plates' worth of openings at two screws apiece, and keeping one pack and one pin-in-Torx driver on the truck covers the whole fleet of devices.