Metallics JRMB93 10-24 x 1 in. Round Head Slotted Machine Screws - Brass - Each

The Metallics JRMB93 is a 10-24 thread, 24 threads per inch, cut to ANSI/ASME B1.1. That is the same thread used on grounding screw holes in outlet boxes and on most wiring device mounting tapping, so it threads into standard 10-24 tapped holes. The 1 inch length gives you plenty of reach through plaster rings or stacked straps, and anything left over can be cut back.

Head and body dimensions follow ASME B18.6.3, the standard for slotted and recessed head machine screws, and the threads follow ANSI/ASME B1.1. Anything else built to those same standards in 10-24 will interchange, so the JRMB93 drops in where a spec calls out a B18.6.3 round head slotted machine screw.

No. The JRMB93 brass machine screws are listed as not Buy American compliant and not ARRA compliant, with country of origin recorded as multiple. If your project carries a domestic sourcing requirement, these will not satisfy it and you need a domestically produced fastener.

Brass is what the JRMB93 is made from, and that is the point of it. Brass is conductive and corrosion resistant, which is why it is the usual choice for grounding and bonding screws rather than plated steel. Metallics lists the field application as the electrical, plumbing, heating and air conditioning industries. If you need high tensile holding strength in a structural connection, a steel or stainless machine screw is the better pick; brass is chosen for conductivity and corrosion behavior, not strength.

A round head stands proud of the surface, it does not sit flush. On the JRMB93 the head measures 0.334 to 0.359 in. across and 0.123 to 0.137 in. tall, so budget about an eighth of an inch of projection and a little over a third of an inch of head diameter clearance. If you need the head buried, you want a flat head screw in a countersunk hole instead.

They come in a jar, 100 pieces, and 100 is the order minimum. Jar weight is listed at 0.84 lbs. For an MRO crib or a service van that is one stocking unit per size, which is why the jar format suits truck stock rather than loose counts at the counter.

No nuts or washers are included. The JRMB93 is sold as screws only, 100 to a jar. Machine screws are made for a tapped hole or a mating nut, so if you are not threading into existing 10-24 tapped prep you need to order 10-24 nuts and any washers as separate line items.

Yes. The JRMB93 is the 10-24 x 1 in. configuration in the Metallics JRMB brass round head slotted series, and other sizes and quantities are available by request. Tell us the diameter, thread count and length you need and we will match it within the series.