Metallics JHFW1151SS Washer 1/4 x 1-3/8 Centering Strut Ch (Jar 100)

A centering strut washer drops into the lips of a strut channel and centers a 1/4 inch bolt or rod in the channel so it can't wander side to side while you tighten it. The JHFW1151SS is the 1/4 x 1-3/8 size, so it takes 1/4 inch hardware and spans a 1-3/8 inch face across the channel lips. Electricians use them on strut-mounted conduit racks, trapeze hangers, and equipment supports where the fastener has to sit dead center on the strut.

The 1-3/8 inch dimension is what makes it fit. Standard strut channel is 1-5/8 inches wide across the outside, and the return lips leave an opening narrower than that, so a 1-3/8 inch washer seats down between the lips rather than riding on top of the channel. That's the whole point of the part. On a narrower slotted channel it won't drop in.

100 per jar. It's sold as a jar pack, which is the format Metallics uses for loose small fasteners, so you're buying the container of 100 rather than individual pieces. For a conduit rack job that's usually more than enough to keep a jar in the van and stop counting.

The JHFW1151SS carries the SS suffix in the part number, which is Metallics' stainless designation on this fastener line. That matters if the strut rack is outdoors, in a wash-down area, or in a parking structure, where a plain steel or zinc washer is the first thing to bloom rust and stain the channel below it. Order by the full part number JHFW1151SS to get the stainless version rather than a plated equivalent.

Yes, the centering washer doesn't replace the nut. It goes on the outside face of the channel to locate the bolt; the spring nut or strut nut still goes inside the channel and does the clamping. A typical assembly on a 1/4 inch rack is strut nut in the channel, the 1-3/8 inch centering washer over the lips, then your 1/4 inch bolt or rod through it. Buy the nuts separately, they aren't included in the jar.

For a 1/4 inch strut-mounted rack the pieces that have to match size are the strut nut, the bolt or threaded rod, and the centering washer. The JHFW1151SS covers the washer at 1/4 x 1-3/8. Standardizing a facility on one bolt size across all the racks means one jar of washers, one box of nuts, and one wrench, which is the reason MRO stockrooms carry these by the jar rather than the piece.