Metallics JW1161SS Washers 1/4 X 1-1/4 Fender SS (Jar 100)

Yes. The JW1161SS is a 1/4 x 1-1/4 fender washer, so the inside hole takes a 1/4 inch bolt or screw and the 1-1/4 inch outer body spreads the load around it. That is the point of a fender washer: the bore matches the fastener, the oversized face does the work.

A standard 1/4 inch flat washer has an outside diameter close to the bolt head, so in thin sheet metal, panel, or soft substrate the fastener pulls straight through. The JW1161SS runs 1-1/4 inches across for a larger bearing surface, spreading clamp load over a much wider footprint. Use it anywhere the hole is oversized or sloppy, or the material is too thin to hold on its own.

They are 316 stainless, which is the marine grade - molybdenum added for chloride resistance. That makes the JW1161SS suitable for exterior strut, rooftop equipment, wash-down areas, and coastal or de-icing-salt exposure where plated or 304 hardware rusts out. For dry interior work it is more corrosion resistance than you need, but it will not hurt anything.

Mechanically yes, the JW1161SS seats on any 1/4 inch fastener. But pairing 316 stainless against zinc or galvanized steel in a wet location sets up galvanic action, and the zinc coating is what gives up. If you are specifying stainless washers because the location is wet, use stainless anchors and bolts with them and keep the assembly all one family.

100 washers per jar, and the jar runs 1.45 lbs. The jar packaging is worth noting for truck and gang-box stock - it reseals, so partial counts do not end up loose in the bottom of a bucket like bagged hardware does.

Typical uses are backing up 1/4-20 strut and channel hardware, mounting boxes and panels to thin wall material, holding down equipment feet on rooftop curbs, and bridging oversized or over-drilled holes so the nut has something to bear on. The wide face is also used under bolt heads on gasketed or painted sheet steel to avoid dishing the panel.