Metallics JFMB80 Screw 12-24 x 1 FH SL MS BR (Jar 100)

At 1 inch, it's longer than the short screws that ship with most devices and plates, so it's meant for thicker build-ups: ganged trim, extension rings, thick plaster or tile rings, or anywhere the factory screw bottoms out before the device pulls tight. If you're fastening a device straight to a flush box with nothing stacked behind the yoke, a 1 inch 12-24 will likely run past the threads and you want a shorter length instead.

No. 12-24 and 10-32 are different threads and are not interchangeable. 10-32 is the thread used for fixture and strap mounting on many electrical boxes, while 12-24 is the larger-bodied, coarser thread used elsewhere. Check the tapped hole in your box or bracket before ordering, because forcing a 12-24 into a 10-32 hole strips it.

Flat head with a slotted drive, per the FH SL in the designation. A flat head seats flush when driven into a countersunk hole, so it's the one to use where a cover plate or trim has to sit flat with nothing standing proud. You drive it with a standard flat-blade screwdriver, not a Phillips.

100 screws per jar. The 12-24 x 1 brass flat head slotted screw is packed in a jar rather than loose or carded, which is the format electricians and maintenance shops keep on the truck or the shelf for repeat device and cover work.

Metallics JFMB80 is the part number, and it is the only model on the order, so there is no size or finish choice to specify. Ordering JFMB80 gets you the 12-24 x 1 inch flat head slotted brass machine screw in a 100 count jar.