Metallics TRM69M 10-32 x 1-1/4 in. Round Head Tri-Drive Machine Screws - Steel Zinc - Each

TRM69M is a 10-32 x 1-1/4 inch round head machine screw in zinc plated steel. The 10-32 machine thread mates with any tapped 10-32 hole or 10-32 nut, so it standardizes with the rest of the 10-32 hardware already in your boxes and brackets. Just confirm your tapped depth or stack thickness suits the 1-1/4 inch length, since a machine screw this long will protrude if the hole is shallow.

Three will work. The TRM69M has a combination head that accepts a flat blade, a Phillips bit, or a square (Robertson) driver, so whatever is already on your belt or in the drill will seat it. Handy on panel and device work where you are not switching bits between fasteners.

The TRM69M is a round head, so it sits on top of the surface with a domed profile rather than pulling down into a countersink. That is what you want for mounting straps, brackets and ground screws in a box. If the hole is countersunk and the head has to finish flush, you need a flat head machine screw instead.

Zinc plated steel is a mild corrosion coating meant for dry interior use. The TRM69M is steel with zinc plating, which is fine inside panels, boxes and interior fixtures. For exterior, wet locations or washdown areas, specify a stainless 10-32 machine screw instead.

Yes, the TRM69M round head tri-drive machine screws are made in the USA, which matters on domestic preference specs for public and institutional work.