Metallics JW125 Washers 1/4 X 9/16 Fender St-zn (Jar 100)

The JW125 fender washer has a 1/4 inch inside diameter, so it goes over 1/4-20 bolts, 1/4 inch machine screws, and 1/4 inch threaded rod. The 9/16 inch outside diameter is the whole point of a fender washer: it spreads the clamping load well past the hole, which is what you want on sheet metal, thin panels, or slightly oversized or slotted holes where a standard flat washer would pull through.

The JW125 is steel with a zinc plating, which handles indoor and normally dry or occasionally damp locations fine. Zinc plate is a sacrificial coating, not stainless, so for continuous wet exposure, coastal air, or corrosive process areas a stainless or hot dip galvanized washer is the better call. For interior strut runs, panel mounting, and boxed conduit supports it's the standard finish.

Same 1/4 inch bore, much larger face. The JW125 runs 9/16 inch across the outside, so it bridges wider holes and distributes bolt load over more surface than a regular 1/4 inch flat washer. Use the fender style when you're fastening through sheet metal, drywall, fiberglass, a slotted bracket, or a hole that got drilled oversize. Use a standard flat washer where the hole is tight and clearance around the bolt head is limited.

Each jar holds 100 of the 1/4 x 9/16 fender washers, and the jar packaging is the practical part: it reseals, so partial counts stay on the van or the shelf without spilling into a gang box. Total shipping weight of the jar is 0.24 lbs.

Yes. The JW125 is an electrical-trade fastener, stocked as a washer for 1/4 inch hardware, and it's the size used under nuts and bolt heads on strut clamps, device and junction box mounting, hanger rod hardware, and panel backboards. Any place a 1/4 inch bolt lands on a soft or oversized hole is where this one earns its keep.