Metallics TRM87M 8-32 x 1-1/4 in. Round Head Tri-Drive Machine Screws - Steel Zinc - Each

The TRM87M round head screw takes three drivers: a flat blade in the slot, a Phillips bit, or a square (Robertson) bit. On a panel or device job that means whatever is already on your belt will turn it, and you can switch to the square drive when you need less cam-out driving overhead.

It is steel with a zinc plating, which handles dry and normally damp interior work. Zinc plated steel is not a corrosion resistant finish for direct weather exposure, wet locations or coastal air, so use stainless steel 8-32 screws for those openings.

The TRM87M has a round head, which is domed and sits proud on the surface, bearing on the full face of the hole rather than countersinking. Use it where the screw head is allowed to show, like box and ring mounting. If the hole is countersunk or the head has to finish flush, such as a cover plate on a flat wall plate, you want a flat head instead. A pan head is the lower profile alternative when clearance behind a trim is tight.

A machine screw has a uniform straight thread, not a tapered wood or sheet metal point, so the 8-32 TRM87M needs a tapped hole or a nut. Electrical boxes, rings and most device yokes come tapped 8-32, so no nut is required there. In plain sheet metal you either tap the hole first or pair it with an 8-32 nut.

Yes, the TRM87M 8-32 x 1-1/4 inch tri-drive machine screw is made in the USA, which matters on public and institutional work carrying domestic sourcing requirements.