Metallics JRM45SLT 12-24 x 1 in. Round Head Slotted Machine Screws - Steel Zinc - Each

It sells in a jar of 100, with 100 count as the order minimum, so a single order line gets you the full jar rather than a loose screw.

The round head on the JRM45SLT sits proud of the surface with a domed crown, head width running 0.382 to 0.408 in. and head height 0.139 to 0.153 in. That works where the screw head is exposed and you want a traditional look, and it is the classic profile for cover plates and box mounting. Slotted drive is driven by a flat blade, which electricians favor because the same screwdriver already on the belt handles it. If you are power-driving hundreds of fasteners or need the bit to stay seated hands-free, a Phillips or combo drive is the better pick, and Metallics offers combination drive machine screws.

These are carbon steel with a zinc plated finish, which handles indoor and dry or occasionally damp interior work. Zinc plating is a sacrificial coating, not stainless, so continuous exterior exposure, wash-down areas, or coastal air will eventually corrode it. For those openings specify a stainless 12-24 machine screw instead.

Tensile strength is rated 60,000 psi minimum with a hardness of Rockwell B70 to B100, made from AISI 1006 to 1022 low carbon steel. That is standard commercial machine screw strength, fine for fixture, box, and device mounting. It is not a structural or graded bolt substitute. The slot itself is the limit on torque: slot width runs 0.056 to 0.067 in. and slot depth 0.073 to 0.096 in., so use a blade that fills the slot fully or you will cam out and burr the head before the threads give.

For a device screwed straight to the box ears, 1 inch is longer than needed and the tail will run past the tapped ear into the box, which is fine electrically but can crowd conductors. Where it earns its length is stacked builds: extension rings, plaster rings, thick tile or stone finishes, or a fixture canopy over a spacer. If you are doing plain flush device work, a shorter 12-24 machine screw is the cleaner choice; the thread pitch of 24 per inch is the same either way, so the two interchange in the same tapped hole.

The JRM45SLT is flagged compliant for both Buy American and ARRA in the product record, while country of origin is listed as China. On federally funded work, submit the compliance flag to your specifier with the origin disclosed so there is no surprise at closeout.

Yes. Metallics states other sizes and quantities are available by request within the JRM round head slotted line, so if you need a different 12-24 length or a bulk count beyond the 100 piece jar, ask for it rather than buying multiple jars.

A jar comes in at 1.12 lbs, in a container measuring 3 by 3 by 2.15 in., so it drops into a standard van bin or a parts drawer without repackaging.