Metallics JWW87G Washers 1 USS Flat Glv (Jar 25)

The JWW87G is a 1 inch USS flat washer, so it is sized for 1 inch diameter bolts, rods, and anchors. USS pattern means a larger outside diameter and bigger hole clearance than SAE pattern of the same nominal size, which is what you want for structural and strut anchoring work where the washer has to spread load over a wider bearing area.

Yes. The JWW87G washers are galvanized steel, so they hold up in damp interiors, exterior strut runs, and other locations where plain steel would rust. Pair them with galvanized nuts and threaded rod to avoid mixing coatings on the same connection.

Each jar holds 25 of the 1 inch USS galvanized flat washers. The jar pack is the shop-and-truck format, which keeps a single size separated on a job where you are also carrying 1/2 and 5/8 hardware.

Use USS, like the Metallics JWW87G, when you are bearing against wood, strut, sheet metal, or an oversized hole and need the load spread wide. SAE washers are thinner with a tighter hole and smaller outside diameter, better suited to machined surfaces and precision joints where clearance is tight. For 1 inch hanger rod and anchor work, USS is the usual call.

It is a plain flat washer, not a split-ring or tooth lock washer. It spreads bearing load and protects the surface under a nut, but it provides no anti-vibration locking. If the connection needs to resist loosening, add a 1 inch lock washer or a locking nut behind it.