Metallics JW121 Washers 1/2 X 2 Fender St-zn (Jar 100)

The JW121 is a 1/2 inch fender washer, so it goes over 1/2 inch bolts, rods, and threaded hanger rod. Outside diameter is 2 inches, which is what gives you the extra bearing surface over a standard 1/2 inch flat washer.

Yes. With a 1/2 inch inside diameter they slip over 1/2 inch all thread rod, and the 2 inch face bears across a strut slot or a channel nut better than a standard washer. Metallics lists the application as electrical, plumbing, heating and air conditioning work, which is exactly that kind of hanger and support assembly.

Use a fender washer like the JW121 when the material under the head is soft, oversized, or already drilled too big, sheet metal, drywall, plywood, fiberglass, or a slotted strut hole. The 2 inch outside diameter on a 1/2 inch bolt spreads the load across a much wider footprint so the fastener does not pull through. A standard flat washer is the right call when you only need thread bearing on solid steel or concrete.

They are steel with a zinc finish, listed as zinc chromate. That is suitable for dry indoor and protected work, electrical rooms, mechanical rooms, interior hanger rod. For continuously wet, exterior, or coastal exposure you want stainless or hot dip galvanized instead, since zinc plating will eventually bleed rust.

Each jar holds 100 of the 1/2 x 2 fender washers, and the jar weighs 5.18 lbs. The jar pack is handy for a service van or a shop shelf since it reseals and you can pour out a handful without hunting through a bag.

Order by Metallics part number JW121. Country of origin is listed as multiple, so sourcing varies by production run. If you are standardizing a facility's fastener stock, spec the JW121 number rather than a description so you get the same 1/2 x 2 zinc plated washer each time.