I was doing a general check over on one of my bicycles today. Using a star hex wrench I tested the chainring bolts. One was loose. I tightened it, then went to tighten the next one. It was a little loose, turned a bit...then it turned free. The front of the bolt threaded into the rear and both fell out on the ground, broken.
My question: should I be going after steel bolts to replace them? I'm wondering if I got cheap bolts or what. I've really cranked down chainring bolts before and never had this happen.
Some searching has revealed that there are aluminum and steel chainring bolts, as well as some that use a hex wrench on both sides, not hex on front side, those funny two teeth bolt wrenches on the back. Those seem like a nice upgrade.
DETAILS: bolt around 6 months old, single-stack (as it is a fixed gear), made by Pyramid (I think a BMX company, which is all the LBS had), and the bolts were greased before tightening them at original installation.