Metallics WW87L Washer 1 USS Flat Wshr St-Zn (Box of 50)

The WW87L is a 1 inch USS flat washer, so it pairs with 1 inch diameter bolts, anchors, or threaded rod. USS pattern means a wider outside diameter and larger hole than SAE pattern at the same nominal size, which is what you want when you need to spread load over wood, sheet metal, or an oversized hole.

Steel with a zinc plating. That gives it indoor and sheltered corrosion resistance for general electrical and mechanical anchoring. For continuous outdoor exposure, wet locations, or coastal work, step up to a hot dip galvanized or stainless washer instead.

Fifty washers per box. That is one carton quantity of 1 inch USS flat washers, which is the practical buy for strut anchoring, rod hanger runs, or stocking a service truck rather than buying loose pieces.

Use the USS pattern, which is what the Metallics WW87L is, when the washer has to bridge an oversized or slotted hole or bear against softer material like wood or light gauge steel. SAE pattern is thinner with a smaller outside diameter and is the better choice when you need the washer to sit inside a tight counterbore or under a small bolt head or nut where a wide washer would overhang.

WW87L is the Metallics part number, covering the 1 inch USS flat washer in zinc plated steel, boxed in 50.

Yes. It is an electrical department fastener, and a 1 inch zinc plated USS flat washer is the standard load spreader under nuts on 1 inch rod and bolt assemblies for strut, trapeze, and hanger work in dry or sheltered locations.