I recently needed to replace the rusted bolts on my stem so I went down to Home Depot and purchased some steel bolts that matched what I originally had. After looking at http://www.boltdepot.com/fastener-in...Materials.aspx I learned that not all bolts are created equal. The bolts I purchased had '12.9' stamped on the head, which indicates to me that its class 12.9 Alloy Steel, which should be very strong but brittle according to boltdepot. I have also seen mention on this board of people using stainless steel bolts, which are weaker but won't rust. FSA sells CrMo stem bolts and of course expensive Ti bolts are also available. My question is, what is the appropriate bolt material for stems and is it different for say seat posts or the top cap bolt?

thank you,
eric