VICI Valco’s 360 µm High-Pressure Fitting design permits direct connection of 360-micron OD fused silica, PEEK, stainless, or electroformed nickel tubing without having to use liners. Because of the fitting’s compact size and fine 2-56 threads, a leak-free connection that seals at pressures well in excess of 20,000 PSI can be created with the available manual tool. The 360 µm fittings are available with a PEEK or stainless nut; the PEEK nut is supplied with a glass-filled PEEK ferrule, while the stainless nut uses a 316 SS ferrule. The ferrule snaps into the nut so that the fitting is “one-piece,” but the ferrule is free to rotate and does not twist the tube as the nut is tightened. A range of micron bore sizes are available.