Metallics JSSW11 Washers 10 Flat SS (Jar 100)

The JSSW11 is sized for #10 fasteners, so it pairs with #10 machine screws, sheet metal screws, and bolts. If you are working with 1/4-20 or 8-32 hardware, you need a different size washer; a washer that is oversized on the shank lets the fastener pull through soft material and one that is undersized will not seat.

Stainless steel, not zinc-plated carbon steel. That matters on exterior work, wet locations, and rooftop or coastal installs where a plated washer will bleed rust onto the surface it is clamping. It also means you can pair it with stainless screws without setting up a galvanic mismatch.

100 washers per jar, packed in a screw-top jar rather than a loose bag. For an electrician or maintenance tech stocking a van or a shop bin, the jar is the reason to buy it this way, it stays sorted and does not spill in a tote.

The JSSW11 is a flat washer, which spreads load and protects the surface under the nut or screw head. It does nothing to resist loosening from vibration. On metal-to-metal joints that see vibration, use a flat washer against the surface and add a split lock washer or a locking nut under the fastener. Metallics lists this one specifically for metal-to-metal applications, which is the typical case for strut, enclosure, and panel hardware.

Yes, that is the intended use. Metallics lists the JSSW11 for metal-to-metal service, and #10 is the common size for device screws, enclosure covers, and small bracket hardware. Note it is a plain flat washer, so it is not an insulating or sealing washer, if you need to isolate dissimilar metals or seal a penetration, that is a different part.

The JSSW11 is built to ANSI dimensional sizing for a #10 flat washer, so it interchanges with other ANSI-dimensioned #10 flat washers already in your bins. That is what lets a specifier or MRO buyer standardize on one washer across a facility rather than keeping brand-specific stock.