Jerry, I had been making hinge pins from through-hardened ejector pins. They will break before they bend which is better for my application.
I get mine from plastixs.com because they are cheaper compared to mcmaster-carr.
By the way, you need the 1/8" diameter which is equivalent to 3.175mm.
http://plastixs.com/ep03.html
Here's my gmaxx build thread which includes some pictures on how I made my pins captured.
http://www.rc-monster.com/forum/show...t=12463&page=4