Metallics JSFN1032SS Nuts 10-32 Serr Flange Locknut SS (Jar 100)

It's a 10-32 nut, meaning a #10 machine screw diameter at 32 threads per inch. That's the standard thread on most electrical enclosure, strut, and panel screws, so it mates with 10-32 machine screws and 10-32 threaded studs. Anything 8-32 or 1/4-20 needs a different nut.

No. The serrated flange is integral and bears on the panel with a 0.480 to 0.500 inch washer outside diameter, so it spreads load like a flat washer and the serrations bite into the surface to resist loosening from vibration. Keep in mind the serrations mar the mating surface, so on finished or painted faces put the nut on the back side.

The JSFN1032SS is 18-8 stainless steel, so it handles wet interior spaces, exterior enclosures, and washdown areas without the rust bloom you get from zinc-plated steel. Pair it with stainless screws to avoid mixed-metal corrosion.

Across the hex flats it measures 0.365 to 0.375 inch, so a 3/8 inch wrench or socket is the fit. Overall width across the flange runs 0.416 to 0.433 inch, which is what you need to clear in a tight channel or strut run.

Nut height is 0.203 to 0.219 inch, with a wrenching height of 0.13 inch, so the screw has to project at least that far past the panel plus full thread engagement. The nut is specified against 0.03 inch panel thickness, so on thicker sheet or doubled-up material step up your screw length accordingly.

Yes. The JSFN series serrated flange locknut is built to ASME B18.16.4-2008, the dimensional standard for prevailing-torque and free-spinning flange lock nuts, which is what a spec reviewer or institutional submittal package usually asks for.

Metallics flags the JSFN1032SS as both ARRA compliant and Buy American compliant. Country of origin is China, so if your contract language requires domestic melt and manufacture rather than the broader compliance flag, verify against your spec section.

A serrated flange nut like the JSFN1032SS locks mechanically, the serrations bite the panel face, so there is no nylon element to soften and it can take heat that would kill a nylon insert nut. The tradeoff: it only locks against a clamped surface, so it is not the choice for a stud with nothing to bear on, and the serrations scar the face. Use a nylon insert nut where the finish must stay clean or where you plan to reuse the nut repeatedly.

They come in a jar of 100, and 100 count is the order minimum, so one jar is the smallest buy. The jar weighs 0.68 lbs and measures 3 x 3 x 2.15 inches, which fits a service van bin or a shop shelf without repacking. Metallics makes other sizes and quantities available by request.