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By certification 
Track bolt used together with the pressing plate, generally pre-buried in the concrete sleepers, to fast the rails.
Its shape is different from the hex bolt, the root is half-round head with two bulges. It is called as fish bolt or track bolt because it is used as connection and fastening of rail and fish plate.
Track bolt models: Φ14×70, Φ16×75, Φ18×90, Φ20×90, Φ22×135, Φ24×135,Φ24×145, Φ24×170. Usually forming by friction press hot press, buckle 50 mm long, also has cold heading forming, mainly used on rail joint connection.
