Anything that can be done to reduce bolt hole stresses will increase the fatigue life of rails. The perfect result is achieved by completely eliminating fishbolt holes. Four methods of improving fishbolt holes are: 1. careful drilling to produce holes of smooth fish; 2. radiusing the edges of the holes; 3. reducing the diameter of the holes; 4. work hardening the internal surface of the holes. Work hardening the hole is achieved by forcibly increasing its diameter after the initial drilling. The fatigue strength of the drilled rails is improved by at least 25 percent by work hardening.

  • Corporate Authors:

    Temple Press Limited

    161-166 Fleet Street
    Longon EC4,   England 
  • Publication Date: 1968-11-6

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Filing Info

  • Accession Number: 00037481
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 24 1976 12:00AM