Metallics JSRM85 1/4-20 x 1-1/4 in. Round Head Slotted Machine Screws - 18-8 Stainless - Each

The Metallics JSRM85 is a 1/4-20 screw, 20 threads per inch on a 1/4 inch diameter, which is the standard coarse machine screw thread used on tapped electrical boxes, fixture studs and strut hardware. If your hole or nut is tapped 1/4-20, it threads straight in. It will not work in a 1/4-28 fine-thread hole.

These screws are 18-8 stainless, the austenitic grade used where plated steel would rust out, so they hold up in wet locations, exterior boxes and corrosive environments. The tradeoff is strength: rated at 80,000 psi minimum tensile, which is below what a hardened steel cap screw gives you. For corrosion-driven jobs stainless is the pick; for high-load structural fastening it is not.

No. The JSRM85 is not Buy American compliant and is not ARRA compliant, with multiple countries of origin. If your contract carries domestic sourcing language, these will not satisfy it and you need a documented domestic-source fastener instead.

The JSRM85 measures 1-1/4 inches under the head, and the round head sits on top of the work rather than sinking in, so the full 1-1/4 inches is available for your clamped material plus thread engagement. Figure your panel thickness plus the depth of the tapped hole or the nut height. If you need to sit flush, a round head is the wrong head style for you.

The JSRM85 ships as a jar of 100 screws, which is the order minimum. It is a shop-stock quantity rather than a loose count of a handful, so it suits an MRO crib or a service truck that goes through 1/4-20 hardware regularly.

Round head, like the JSRM85, sits proud on the surface and needs only a plain clearance hole, so it is the default when you are fastening through sheet metal or a strap. Choose a flat head instead when the part is countersunk and the screw must finish flush. Mixing them up leaves either a screw that rocks in a countersink or a head that fouls a cover.

Hardness runs Rockwell B85 to B95 with a minimum tensile of 80,000 psi, typical of annealed 18-8 stainless. Treat them as a medium-duty fastener: snug them, do not gorilla them. Stainless galls when driven fast into a stainless nut, so run them in slowly or use an anti-seize on the threads.

Metallics builds the SRM round head machine screw line for the electrical, plumbing, and heating and air conditioning trades. Typical use is mounting devices, straps, brackets and covers to tapped holes or nuts where corrosion resistance matters more than raw clamp load.