Metallics JRM12SLT 10-24 x 5/16 in. Round Head Slotted Machine Screws - Steel Zinc - Each

Yes. The JRM12SLT is a 10-24 machine screw, 24 threads per inch, which is the thread used on steel outlet box and device ring mounting holes. At 5/16 inch long it is a short screw meant for mounting a device or cover directly to tapped holes, not for spanning extension rings or thick plaster covers. If you need to reach deeper, order a longer 10-24 screw.

A flat blade screwdriver. The JRM12SLT uses a slotted drive, with a slot width of 0.05 to 0.06 inch and a slot depth of 0.065 to 0.087 inch, so a standard small flat tip seats properly. No Phillips or combo recess on this one.

The head measures 0.334 to 0.359 inch across and stands 0.123 to 0.137 inch above the surface. That matters when you are screwing into a recess or behind a plate with limited clearance: a round head sits proud rather than flush, so if the head has to sit level with the surface you want a flat head screw instead.

They come in a jar, with a minimum order of 100 count. So a single purchase is a 100-piece jar rather than loose screws, which is how most MRO and electrical shops want them stocked on the shelf.

The JRM12SLT is zinc plated carbon steel, which is a dry indoor-location finish. Zinc gives light corrosion protection, nothing more. For wet locations, exterior work, or anywhere washdown or coastal air is a factor, go with a stainless 10-24 machine screw instead.

Minimum tensile strength is 60,000 psi, with a hardness of Rockwell B70 to B100, made from AISI 1006 to 1022 carbon steel. That is ordinary low-carbon machine screw strength, fine for mounting devices, covers, plates and fixture hardware. It is not a structural or high-grade fastener, so do not substitute it where a graded bolt is specified.

The JRM12SLT is flagged compliant for both ARRA and Buy American in the product record, with country of origin China. If your contract language requires domestic melt and manufacture rather than the compliance flag, verify the documentation against your specific spec before submitting.

Round head, which is what the JRM12SLT uses, has a domed top that bears on the surface and stays visible, so it suits mounting brackets, covers and straps to tapped holes. A flat head is countersunk and finishes flush, needed where nothing can protrude. Pan head is a lower-profile bearing head used where you want a broad seat without the dome. All three are the same 10-24 thread, so they interchange in the hole; only the head appearance and clearance change.