Originally Posted by JerrySTL

If you are a weight-weenie, go titanium!

Titanium Bolts, Titanium Bolt, Titanium Fastener, Ti Hardware, Nuts

Originally Posted by Just Riding

I have run into stems using 7mm diameter bolts... a real oddball. Calipers and a pitch gage are your friends.

Also many stems seem to use bolts with a reduced diameter head; standard hardware will not fit these stems. I haven't seen any sources for these bolts, unless you want to buy them in OEM quantities.

I don't know why manufacturers go to the trouble of using non-standard hardware.