Metallics JSRM71 10-24 x 5/8 in. Round Head Slotted Machine Screws - 18-8 Stainless - Each

The Metallics JSRM71 is a 10-24 thread screw, 24 threads per inch, which is the standard machine screw thread used for device and ground screw holes in steel outlet boxes, mounting brackets and strut fittings. At 5/8 in. long it gives you enough thread to pick up a tapped hole plus a lug or strap. If the hole in your box is tapped 8-32 instead, this will not start in it.

Yes. The JSRM71 screws are 18-8 stainless throughout, not plated steel, so they hold up in wet and damp locations where a zinc-plated screw would rust and seize. Hardness runs Rockwell B85-B95 and tensile strength is 80,000 psi minimum. Note that Metallics states tensile values for stainless screws as approximations, since there is no single performance standard for stainless machine screws.

No. The JSRM71 is not Buy American compliant and is not ARRA compliant, and the country of origin is listed as multiple. For a federally funded project with domestic sourcing requirements on fasteners, these will not satisfy the spec and you need a domestically manufactured machine screw.

These ship as a jar of 100, and 100 is the order minimum, so it is a bulk pack rather than a loose count. The jar weighs 0.59 lbs. Metallics does offer other sizes and quantities in the SRM round head slotted line by request.

Head width measures 0.334 to 0.359 in. and head height 0.123 to 0.137 in. That domed round head gives you roughly a third of an inch of bearing surface, enough to span an oversized or slotted hole in a strap or bracket without a washer in most cases. It does not sit flush, so if you need a flush surface you want a flat head countersunk screw instead.

At 5/8 in. of length under the head, the 10-24 JSRM71 suits stacked material up to about a quarter inch plus a tapped hole, which covers typical device mounting, strap and bracket work. For thicker assemblies or where you are running a nut on the back side you want a longer screw in the same SRM line, which Metallics offers in other lengths by request. Stainless screws also gall when overdriven, so run them in by hand rather than on an impact.

Metallics lists the field application as the electrical, plumbing, heating and air conditioning industries. In practice that means mounting devices and plates in boxes, fastening straps and clamps, hanging equipment off strut, and general panel and enclosure work where a 10-24 tapped hole is already there. Thread dimensions follow the SAE material standard.