Metallics JTRM69 10-32 x 1-1/4 in. Round Head Tri-Drive Machine Screws - Steel Zinc - Each

The JTRM69 round head takes a slotted, Phillips, or square (Robertson) driver, so one screw works with whatever bit is already in your drill or whatever screwdriver is in the pouch. That tri-drive head is why electricians keep them on the truck for device and box work: no hunting for the right tip.

These are steel with a zinc plating, which is a dry, indoor-rated finish. It handles normal interior humidity fine, but in wet locations, exterior boxes, coastal air, or washdown areas the plating will eventually rust through. For those openings specify stainless steel machine screws instead.

Round head, which is what the JTRM69 uses, sits on top of the surface with a domed crown and spreads bearing load on the part it holds down. It is the right choice when the hole is not countersunk, which is the usual case on steel boxes, brackets, and plaster rings. Flat head screws need a countersunk or chamfered hole to pull flush; drive one into a plain punched hole and it will stand proud and cock to one side.

They ship in a jar, 100 screws per jar. That packaging is aimed at bench and van stock where you want to scoop a handful rather than open a sealed box. Each listed item is the jar quantity, not a single screw.

Yes, the JTRM69 round head tri-drive machine screws are US made. That matters on public and institutional jobs where domestic sourcing is written into the specification.