Production introduction The brand Clufix provided a solution for installation internal thread in Metal tubes, plates or component side. The Clufix nuts also can be used to connecting two or more parts. It could replace the welding procedure and lapping process. It has many advantages such as: one sided connection, installation, low cost and so on. Through the cooperation with Alston, Bombardier, Clufix has been widely used in 200 KM bullet train and 350 KM High-speed rail.