Metallics JG8WW86 Washers 5/8 G8 USS Flat St-zn (Jar 100)

It's a 5/8 inch USS pattern flat washer, so it pairs with 5/8 inch bolts and threaded rod. USS pattern means the wider, larger-OD flat washer rather than the tighter SAE pattern, which is what you want when the load needs spreading across softer material like wood blocking or sheet steel.

Yes. The JG8WW86 is a Grade 8 hardened steel washer, which is the point of specifying it: a standard low-carbon washer will cup or emboss under a Grade 8 fastener torqued to spec. Hardened steel keeps the bearing face flat so you hold the clamp load you torqued to.

One hundred washers, packed in a jar rather than a bag, which is the format most van stock and shop bench setups want because it reseals and does not spill. The jar weighs 7.16 lbs.

The JG8WW86 carries a zinc chromate finish, which handles indoor, mechanical room, and normally dry concealed work well. For sustained wet exposure, direct weather, or coastal air, step up to a hot dip galvanized or stainless flat washer instead; zinc chromate is a light corrosion coating, not a marine finish.

That's exactly the intended use. Metallics lists these for the electrical, plumbing, heating and air conditioning trades, so 5/8 inch all-thread hanger rod, strut connections, and equipment anchoring are the typical jobs. Pair them with a 5/8 nut and, where vibration is a factor, a lock washer or double nut.

Wrought means the washer is formed from rolled steel plate to a controlled thickness and flatness, which is what lets it act as a proper bearing surface under a hardened bolt. A fender washer is a thin, very large diameter washer meant to cover an oversized hole, and it will deform under Grade 8 torque. The JG8WW86 is the wrought type in 5/8 inch USS.