Metallics JRMB48 10-32 x 3/4 in. Round Head Slotted Machine Screws - Brass - Each

Yes. The Metallics JRMB48 is a 10-32 screw cut to the ANSI/ASME B1.1 thread standard, which is the same 32 threads-per-inch 10-32 thread used for device mounting holes and box ears in standard electrical boxes. The 3/4 inch length gives you enough thread for mounting a device, cover, or ground lug through a plaster ring or box ear.

Brass is the body material on the JRMB48, and that matters in two places electricians care about: brass is conductive, so it is the usual choice for bonding and grounding screws, and it resists corrosion in damp or outdoor enclosures better than plain steel. If you need high tensile strength rather than conductivity or corrosion resistance, a steel or stainless 10-32 is the better pick.

No. The JRMB48 brass machine screws are listed as not Buy American compliant and not ARRA compliant, with multiple countries of origin. For a job with domestic sourcing requirements you need a domestically produced fastener instead.

The head measures 0.334 to 0.359 inch across and sits 0.123 to 0.137 inch proud of the surface. That domed profile is not countersunk, so if your plate or bracket is counterbored for a flat head you want a flat head 10-32 instead. The head diameter is wide enough to bear on a standard oversized or slotted mounting hole without a washer in most device work.

They are built to ASME B18.6.3, the dimensional standard for slotted and recessed head machine screws, with threads to ANSI/ASME B1.1. That means head and slot geometry are interchangeable with any other B18.6.3 round head 10-32, so they will drop into the same prep as the screws you are replacing.

They come in a jar of 100, and 100 is the order minimum, so you are buying by the jar rather than by the piece. The jar runs about 3 inches wide by 3 inches long and 2.15 inches high and weighs 0.73 lbs, which makes it easy to keep on a service van or in a parts drawer.

At 3/4 inch of shank under the head, you get useful thread engagement through a plaster ring, cover plate, or bracket into a tapped hole or nut. Stack much more than about half an inch of material and the remaining thread gets short, in which case step up in length. Metallics offers other lengths and quantities in the JRMB series by request.

Metallics lists the application as the electrical, plumbing, heating and air conditioning industries. In practice that is device and cover mounting, bonding and ground screw duty, clamp and strap fastening, and general panel and enclosure work where a corrosion-resistant brass screw is wanted.