Brass Nut, 1/4

The Midland Metal Brass Nut in 1/4-inch is the threaded compression nut that completes a compression tube fitting, drawing the ferrule against the tubing to form a tight, leak-resistant seal. Machined from durable brass, it provides the strength, thread integrity, and corrosion resistance needed for dependable water-line connections in treatment systems and small-diameter plumbing.

In a compression assembly, this nut threads onto the fitting body, and as it tightens it presses the sleeve, or ferrule, onto the tubing. That compression locks the tube in place and seals the joint against leaks. The whole connection depends on having the correctly matched 1/4-inch nut, since proper thread engagement and even, controlled compression are what produce a joint that holds firmly under operating pressure without weeping or pulling apart.

• Brand: Midland Metal Mfg
• Fitting type: compression nut
• Material: brass
• Size: 1/4 inch
• Pairs with matching ferrule and fitting body
• Item weight: 0.01 lbs

This nut is a common assembly and replacement part for installers working with 1/4-inch tubing on reverse osmosis systems, filters, and accessory lines, where compression connections are the norm. Nuts can become cross-threaded, stripped, or simply misplaced during service, so having correct replacements available keeps a job moving rather than stalling over a missing piece of hardware.

For a complete, reliable fitting, pair this nut with the correct sleeve and, when using soft tubing, a tube support insert that keeps the tube round under compression. When assembling, thread the nut on by hand first to avoid cross-threading, then tighten to a firm, leak-free fit without over-torquing. Inexpensive and genuinely essential, brass compression nuts are exactly the kind of small part worth keeping in stock for quick, clean repairs and confident installations. Treating the nut, ferrule, and tube support as a matched trio when assembling a connection takes the guesswork out of the job and produces consistent, repeatable results across every fitting you make. For RO and filter work in particular, where many small connections share a tight space, having the correct nuts on hand in the right size keeps the assembly tidy and predictable rather than a patchwork of mismatched hardware. A consistent kit of nuts, sleeves, and supports turns fiddly tubing work into a smooth, repeatable routine.