Metallics JSRM144 10-24 x 1-1/2 in. Round Head Slotted Machine Screws - 18-8 Stainless - Each

The JSRM144 is 18-8 stainless, which is the austenitic stainless grade used where plated steel screws would rust, so it suits damp, wet, and exterior locations as well as coastal and washdown areas. It's the usual choice for exterior boxes, pool and spa equipment, and HVAC work outside.

No. Machine screws like the JSRM144 are for fastening equipment and enclosures, not structural loads. The listed tensile strength is 80,000 psi minimum, and tensile values for stainless screws are approximations only, since there is no single performance standard for stainless machine screws. For anything load-rated, use a bolt specified to a recognized grade.

No. The JSRM144 is not Buy American compliant and not ARRA compliant, and country of origin is listed as multiple. On federally funded or domestic-content jobs you'll need a domestically sourced fastener instead.

They ship in a jar of 100, and 100 is the order minimum. The jar itself weighs 1.13 lbs. If you need a different count or a different length in the same 10-24 round head slotted pattern, other sizes and quantities are available by request.

The round head measures 0.334 to 0.359 inches across with a head height of 0.123 to 0.137 inches. That's roughly a third of an inch of bearing surface, enough to span a slightly oversized 10-24 hole or a short mounting slot, but it is a domed round head rather than a flat countersink, so it sits proud of the surface and won't sink flush.

Inch. The JSRM144 is built to SAE material standard with a 10-24 unified coarse thread, so it mates with inch-series 10-24 tapped holes and nuts. It will not thread into an M5 metric hole.

Hardness on the JSRM144 is Rockwell B85-B95, which is softer than hardened carbon steel. Stainless galls and the slot can burr if you overdrive it, so seat these with a proper-width flat blade and avoid impact drivers. The recess gaging depth of 0.082 to 0.108 inches tells you how far the blade engages before it bottoms.

Metallics lists the field application as electrical, plumbing, heating and air conditioning. In practice that's box and device mounting, strap and clamp attachment, panel and enclosure hardware, and securing sheet metal brackets on mechanical equipment. The 1-1/2 inch length is the one you keep on the truck for anything with stacked material or a spacer behind it.