Metallics JW128G Washers 1/2 X 1-1/4 Fender Galv (Jar 100)

The JW128G is a 1/2 inch fender washer with a 1-1/4 inch outside diameter, so it takes a 1/2 inch bolt, rod, or lag. The large OD relative to the hole is the point: it spreads load over sheet metal, plywood, drywall, or an oversized hole where a standard flat washer would pull through.

They're galvanized steel, so the zinc coating gives reasonable corrosion resistance for damp locations, exterior strut runs, and unconditioned spaces. For continuous saltwater exposure or direct chemical contact, stainless is the better call.

100 pieces per jar. Metallics ships these in a screw-top jar rather than a bag, which is why they survive a gang box or a van drawer better than a poly bag. The packed jar weighs 1.39 lbs.

Use the fender when the hole is oversized or the material is thin. A 1/2 inch SAE flat washer has a small OD and bears only right around the bolt head; the JW128G's 1-1/4 inch OD spreads the same load across a much larger footprint, which is what keeps a 1/2 inch all-thread or anchor from crushing through sheet metal, a deck, or a sloppy drilled hole. For bolting steel to steel through a properly sized hole, a standard flat washer is enough.

Yes, that's a normal use. The wide 1-1/4 inch bearing surface on a 1/2 inch hole distributes clamping load so the fastener doesn't dish or tear soft facing material. Galvanized steel keeps it from staining through paint in damp areas.

Yes, it's an ANSI-dimensioned washer, so the 1/2 inch ID and 1-1/4 inch OD follow standard sizing rather than a proprietary pattern. That matters for MRO stocking: it interchanges with other ANSI-spec 1/2 inch fender washers already on the shelf.