Metallics JSSW14D Washers 3/8 Flat SS (Jar 100)

Solid stainless steel, not a plated carbon steel washer. That matters for outdoor strut runs, damp mechanical rooms, and coastal or wash-down areas where a zinc-plated washer rusts and streaks the fixture.

Yes. A 3/8 flat washer is the standard spreader under the nut on 3/8 inch rod hangers, strut nuts, and channel clamps, which is exactly the electrical work this Metallics washer is stocked for. Stainless construction lets you keep the same washer on exterior and damp-location hangers.

Each jar holds 100 washers. The jar pack is handy on a service van because it reseals and keeps the loose hardware from mixing with other sizes in a bin.

Different jobs. A flat washer like the JSSW14D spreads load and protects the surface under the nut or bolt head, and keeps the fastener from pulling through sheet metal or an oversized hole. It does not resist loosening from vibration. On equipment that vibrates, use a split lock washer or a locking nut for the clamp load and add the flat washer underneath it as the bearing surface.

Country of origin on the JSSW14D is the United States, which matters if you are buying against a domestic-preference spec on a government or institutional job.

It is built to ANSI dimensional standards, so the inside and outside diameters follow the standard 3/8 flat washer pattern and it will interchange with other ANSI 3/8 flats already on the job.

Stainless against galvanized strut or aluminum is a dissimilar-metal pairing, so in wet exterior locations expect some galvanic attack on the zinc or aluminum over time. Indoors and in dry locations it is a non-issue, and stainless is the right call where the washer itself has to stay rust-free.

One part number, JSSW14D, covering the 3/8 inch stainless flat washer in a 100-count jar. There are no finish or size options to pick, so for other bolt diameters you need a different Metallics part number.