How to make sure steering box doesn't loosen up?

Interesting information on bolts:


http://www.boltscience.com/pages/tighten.htm

http://www.precisionenginetech.com/...measuring-connecting-rod-bolt-stretch-part-1/

This one also talks about then effects on the threads:

http://www.zparts.com/zptech/tech_tips/kbtt/pages/tech_tip2b.html