Compression Tube Nut Fittings

Compression Tube Nut Fittings create a mechanical seal on copper, plastic, or aluminum tubing using a nut, sleeve, and fitting body tightened together with hand tools, without soldering, flaring, or specialized crimping equipment. This makes them a preferred choice for plumbing repairs, appliance connections, and instrumentation lines where a permanent soldered joint is impractical or where the connection may need to be serviced again later.

Legines machines this range from C36000 brass, with the compression sleeve (ferrule) designed to bite into the tubing surface as the nut is tightened, creating both a mechanical grip and a seal in a single motion. Sleeve geometry is matched precisely to each tube size and wall thickness, since an incorrect sleeve profile is the most common cause of compression fitting leaks in the field, not the fitting body itself.

The catalog includes straight unions, male and female adapters, elbows, tees, and reducing configurations, covering copper tube sizes from 1/8" through 1", with additional sleeve options for thin-wall aluminum and rigid plastic tubing used in appliance and instrumentation applications. NPT and BSPP thread options on the fitting body let the same compression connection integrate with either North American or international piping systems.

Serviceability is the core advantage of this category over soldered or crimped alternatives: a compression fitting can be disassembled and reassembled multiple times for maintenance or system modification, provided the sleeve has not been overtightened or damaged during the original installation. Legines includes torque guidance with technical documentation to help installers avoid the overtightening that leads to sleeve deformation and eventual leak paths.

Plumbing supply distributors, appliance parts wholesalers, and instrumentation equipment suppliers order this category because it covers repair and retrofit work that soldered or push-in fittings cannot easily address, particularly on older systems where tubing surfaces are no longer perfectly round or smooth. Legines maintains matched nut-and-sleeve tooling across every size to keep the mechanical seal reliable batch after batch.