The RailTec Process was developed for the rail industry by FTI as a preventative system to diminish rail breakages, track-related accidents and derailments. The life of a bolt hole is increased significantly by producing a zone of residual compressive stresses around the hole by a mandrel pulled through a split sleeve.
Testing ER32 Nickle coated nut vs std nut and bearing nut, torque to 135Nm (100 ft/lbs).