Nut, Type Compression, Tube Size 3/8 In., Tube Outside Dia. 3/8 In., Thread Size 17/32-24 In., Thread Connection, Material of Construction Brass, Pressure (PSI) 150, Temp. Range -40 to 200 Degrees F, Hex Size 5/8 In., Length .63 In., Compliance SAE J246, SAE J1131, DOTFMVSS 571.106'.