Metallics JRM53SLT 1/2-13 x 1 in. Round Head Slotted Machine Screws - Steel Zinc - Each

The JRM53SLT is a 1/2-13 machine screw, 1 inch long. That's a 1/2 inch nominal diameter at 13 threads per inch, which is the standard UNC coarse pitch for 1/2 inch fasteners, so it will run into any 1/2-13 tapped hole or standard 1/2 inch coarse nut.

These are zinc plated carbon steel, made from AISI 1006 to 1022 steel. Zinc plating handles dry indoor work, panel boxes, gutter and strut assembly inside a building. For wet exterior, washdown, or coastal exposure, zinc will eventually bloom and rust, so specify a stainless machine screw instead.

The round head gives a domed, finished crown that sits proud of the surface and spreads bearing over an oversized hole, so it's the pick where you don't want a flush countersink. The slotted drive takes a plain flat blade, which is why it still shows up on electrical trim and older equipment where everyone has a screwdriver on the belt. If you're driving a lot of them with a powered driver, a Phillips or combo drive seats better and cams out less; Metallics offers combo drive screws as well.

Metallics flags the JRM53SLT as both ARRA compliant and Buy American compliant, with country of origin China. On a federally funded project, run those two flags past your project's specific domestic content requirement, since the threshold varies by funding program.

No. The JRM53SLT is sold as screws only, 100 to a jar. If your hole isn't tapped you'll need to order 1/2-13 hex nuts separately, plus flat washers if you want to spread load under the round head on sheet metal or a slotted strut hole.

They ship in a jar, with a minimum order of 100 count. Total packed weight is 7.45 lbs, and the jar measures 4.5 in by 4.5 in by 7.25 in. Metallics states other sizes and quantities are available by request.