Metallics TP400SRC Screws 6-32 x 1/2 RH 1way TR MS USA 1 (100 pcs)

The TP400SRC is a one-way tamper-resistant machine screw. The drive geometry lets it be driven in but not backed out with a standard screwdriver, which is why it gets used on cover plates, enclosures and fixtures in public areas where you do not want the hardware walking off. Plan on it being permanent unless you have an extractor, so do not use it where you expect routine service access.

It is a 6-32 x 1/2 inch machine screw, so it threads into a 6-32 tapped hole and gives you a half inch of length under the head. 6-32 is the standard machine screw thread on electrical device boxes, plates and fixture straps, which is the work this screw is meant for.

Yes. Steel and plastic device boxes are tapped 6-32, and a 1/2 inch length is the common grab for mounting a device, strap or cover to the box ears. Because the TP400SRC is a machine screw and not a self-tapper, the hole has to already be threaded 6-32, not a plain pilot hole in sheet metal.

It has a round head, so it seats on top of the surface rather than pulling down into a countersink. If your plate or bracket has a chamfered, countersunk hole and you need the head flat with the face, a round head is the wrong choice there, you want a flat head instead.

No. A one-way screw drives with an ordinary flat blade screwdriver. The slot is ramped so the blade cams out when you try to turn it counterclockwise, which is what keeps it from being removed. Nothing proprietary to buy on the install side.

Machine screw. It has uniform 6-32 machine threads that mate with a tapped hole or a nut, and it will not form its own thread in unthreaded metal. For an untapped hole you need a sheet metal or self-drilling screw, not this one.

One hundred pieces per pack. That is sized for a facility or MRO buyer doing a run of cover plates or enclosures in one pass rather than a single repair, and it is US made.