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This notice only relates to “Shoulder End Holder” Inserts that were purchased prior to May 2004 and that have been used repeatedly at testing forces above 30,000 lbs (133 kN).
The insert is rated for 60,000 lbs (267 kN). Instron has determined that a fatigue failure of the insert may result from repeated test’s at forces above approximately 50% of the insert’s rated capacity. Use below 50% of capacity is not expected to lead to failure.
A design change was made to the thread of this insert in April 2004 that has addressed this issue.