Quote:
Originally Posted by VIVA GT
1) I believe that the idea of stretch bolts is that they are stressed below their elastic limits. Usually there is a check torque for things like cylinder head bolts to check that they've not gone beyond that point.
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Good expalanation here
http://www.gomog.com/allmorgan/stretchbolts.html and they are specifically designed to be tightened such that they go beyond their elastic limit which has a number of advantages explained in the article, particularly for automated assembly and reduced maintenance.