Metallics JRMB100 1/4-20 x 3/4 in. Round Head Slotted Machine Screws - Brass - Each

Yes. The Metallics JRMB100 is cut to 20 threads per inch on a 1/4 inch diameter, to the ANSI/ASME B1.1 thread standard, so it mates with any standard 1/4-20 tapped hole, nut, or threaded insert. Overall screw length is 3/4 inch, so your combined material thickness plus nut needs to stay under that.

No. A round head sits proud of the surface by design. Head height on the JRMB100 runs 0.16 to 0.175 inch and head width 0.443 to 0.472 inch, so it bears on top of the material rather than sinking into a countersink. If you need flush, specify a flat head machine screw instead.

No. The JRMB100 brass machine screws are not Buy American compliant and are not ARRA compliant, with multiple countries of origin. If your project specification carries a domestic sourcing requirement, these will not satisfy it.

Solid brass. The material on the JRMB100 round head machine screw is brass, not a plated steel screw, which is why it holds up in damp locations and around dissimilar metals where a plated screw would rust through at the coating.

They ship 100 to a jar, and the jar is the order unit, so one order line gets you 100 screws rather than a single piece. The packed jar weighs 0.86 lbs.

They are made to ASME B18.6.3, the dimensional standard for slotted and recessed head machine screws, with threads to ANSI/ASME B1.1. That is what lets the head height, head width, and slot dimensions be quoted as held ranges rather than nominal figures.

These 1/4-20 brass round head screws are catalogued for the electrical, plumbing, and heating and air conditioning trades, and brass is conductive and corrosion resistant, which is why it is commonly chosen over plated steel for bonding hardware. Note the standard green grounding screw is typically 10-32, so confirm your lug or enclosure is tapped 1/4-20 before ordering.

No. A machine screw has a uniform straight thread with no point, so it needs a pre-tapped hole, a nut, or a threaded insert. For wood or drywall you want a wood screw or a self-drilling screw, not the JRMB100.

No tensile figure applies here. Metallics notes that tensile values given for machine screws are approximations only, since there is no single standard for machine screw performance requirements. Treat brass as a corrosion and conductivity choice rather than a structural one, and go to a Grade 5 or stainless steel fastener where a load rating is specified.