Metallics TRM22M 1/4-20 x 3/8 in. Round Head Tri-Drive Machine Screws - Steel Zinc - Each

The TRM22M has a tri-drive round head, meaning the same screw accepts a flat blade, a Phillips bit, or a square (Robertson) driver. On a panel or box install that means whatever is already on your belt will turn it, and a stripped Phillips recess can usually still be backed out with a slotted blade or square bit.

The TRM22M is cut 1/4-20, which is the common coarse machine thread used for 1/4 inch tapped holes in enclosures, struts, and ground lugs. At 3/8 inch of length it is short, so it suits bolting through sheet metal or into a tapped boss, not stacking several thicknesses. If you need to pass through more than about 1/4 inch of material plus a nut, step up to a longer screw.

It is zinc plated steel. Zinc handles indoor and protected locations fine and gives some corrosion resistance in damp interior spaces, but it is not stainless. For direct weather exposure, coastal air, or wet process areas, specify a stainless 1/4-20 machine screw instead.

Round head, so it sits on top of the material with a domed profile and a bearing shoulder against the surface. It will not sit flush. If the part needs to be flush or a mating piece slides across it, you want a flat head in a countersunk hole instead; round head is the right call for general panel, bracket, and cover fastening where protrusion doesn't matter.

No. These are machine screws only, no nuts or washers in the pack. Tapped holes need nothing extra, but through-bolting means ordering 1/4-20 hex or machine screw nuts separately, plus flat or lock washers if the joint will see vibration.

Yes, the TRM22M is US made, which matters if you are filling a government, school district, or federally funded job that carries a domestic-sourcing requirement on fasteners.