My rear axle has gradually bent, causing the wheel to be crooked. It was a 15 speed mountain bike. I did a search and couldn't find a source for a grade 8 axle or all thread. I couldn't find one local. It's a 10mm x 1.0 pitch. I decided to use an old head bolt for a car. I don't know the grade, but I'm sure its harder after working with it and the size was close. I ground off the old threads and will need to cut down the head for proper length. I bought a new die and threaded most of it. I'll post pics if it works. It cost $6 for the die so far.