Metallics JG5WW80 Washers 1/2 G5 USS Flat St-zn (Jar 100)

The JG5WW80 is a 1/2 inch USS pattern flat washer, so it is sized for 1/2 inch bolts, rods and anchors. USS pattern means a larger outside diameter and a slightly wider bore than the SAE washer of the same nominal size, which is what you want when you are spreading load on a softer or slotted surface, or when the hole in the strut or bracket is oversized.

Go USS, like the Metallics JG5WW80, when the bearing surface is wood, sheet metal, unistrut or a slotted hole and you need the extra outside diameter to spread the clamp load. Go SAE when the washer has to sit inside a counterbore or under a small hex head where a wide washer would overhang. Both take a 1/2 inch bolt; the difference is footprint, not fastener size.

They are steel with a zinc plating. That handles dry interior electrical and mechanical work, damp locations and normal indoor humidity. For direct exposure to weather, chemical washdown or coastal air, step up to stainless or hot dip galvanized instead.

Each jar holds 100 of the 1/2 inch USS flat washers. The jar is the unit of sale, and the whole jar weighs 0.64 lbs, so it is easy to keep a couple on a van shelf or in a job box without a loose-parts mess.

Yes. The 1/2 inch USS flat washer is a standard item on electrical fastener carts, used under nuts on 1/2 inch all thread rod for trapeze hangers, on strut channel nuts and on 1/2 inch anchors. The wide USS outside diameter is what keeps the nut from pulling through a strut slot.

The jar measures 3 x 2.15 x 3 inches, which drops into a standard small parts bin or a van drawer without repackaging. Useful if you are standardizing MRO stock and want every fastener size in its own labeled container rather than bulk bags.

Country of origin is China. That matters if you are bidding public work with domestic sourcing requirements, so check the spec section on the job before you submit these.