An arduous programme of high temperature and vibration testing has proved that the Cross Spiralock wire thread insert can withstand repeated exposure to these conditions with virtually no deterioration in its free running and thread locking performance. By comparison, a conventional prevailing torque insert failed completely after the very first heating and vibrating test cycle.
The results are all the more remarkable since the Cross Spiralock insert used was a standard stainless steel version whilst the prevailing torque insert was made of expensive Nimonic 90 and silver plated.