This standard specifies the requirements for dimensions, material composition, mechanical properties, and testing of track bolts and nuts used in railway track fittings and rail joints to ensure safe operation under dynamic loads.
Specifies requirements for bolts and nuts used for fastening railway tracks.
Quick Reference Values
Thread Tolerance Class6g/6H
Minimum Tensile Strength600 MPa (Typical)
Minimum Elongation15%
Practical Notes
Track bolts are subjected to severe dynamic impact and vibration; strictly verify the material grade and heat treatment to prevent fatigue failures.
Ensure exact compatibility of thread tolerances between bolts and nuts to avoid loosening during train movement.