The 1/4" Tube x 1/4" FPT Brass Compress-Align® Female Connector is 1.24" long, has a 11/16" hex and a .188" diameter flow. The compression end has 7/16-24 straight thread. Both fitting and nut are brass. Fittings will work with copper, aluminum, TFE, FEA, PFA, or thermoplastic tubing. Temperatures range from -65°F to 250°F. Maximum pressure is 1,400 PSI.