Metallics JSFN832SS Nuts 8-32 Serr Flange Locknut SS (Jar 100)

No. The JSFN832SS is a hexagonal serrated flange lock nut, so the serrations under the integral flange bite into the mating surface and resist back-off on their own. The flange also spreads the clamp load like a built-in washer, with a washer face outside diameter of 0.452 to 0.469 in. One nut, one step, no split washer or star washer to stock alongside it.

Yes, that is how it works - the serrations dig into the bearing surface to lock. On painted, plated or finished panels and on soft materials like plastic or aluminum trim, the serrations will mark the surface and break the coating. For a finished face, use a plain hex nut with a flat washer or a nylon-insert locknut instead. Where the joint is hidden structural steel, strut or an enclosure interior, the JSFN832SS is the faster choice.

The JSFN832SS is 18-8 stainless steel, which is the usual choice for damp locations, outdoor enclosures, wash-down areas and food-service work where a zinc-plated steel nut would rust. Paired with stainless or aluminum hardware it behaves well; against plain or galvanized steel expect the normal dissimilar-metal behavior, so keep the pairing consistent where you can.

They ship as a jar of 100, and 100 count is the order minimum, so that jar is the smallest unit. Metallics offers other sizes and quantities in the JSFN series by request.

It is built to ASME B18.16.4-2008, the dimensional standard for prevailing-torque and flange lock nuts, so the hex, flange and thread dimensions are to spec rather than a house pattern. That is the reference to cite on a submittal.

Metallics lists the JSFN832SS as ARRA compliant and Buy American compliant, with country of origin China. Confirm which standard your contract actually invokes, since Buy American compliance flags and domestic-melt requirements are not always the same test.

The packed jar weighs 0.62 lbs and measures 3 in. by 3 in. by 2.15 in., small enough to drop in a pouch or a van bin without taking a shelf.