I don't see a need for a mil spec bearing.
If you look at the entire system a com-8t bearing is not the weakest link.
The spacer/shim that is in-between the 12mm bolt and the 1/2 boar of the bearing will be the first thing to give way with a metal bearing.
You need Teflon "PTFE" lined bearings. This is a must.
I didn't find the Aurora bearings in stock the few places I checked.
I was in a rush and Mc Masters-Carr had them.
CT Engineering has the 7/8 in stock. They made me a deal on them.
Unfortunately I had to send them back since I needed the 1'.
Good luck.
Later,
Don
If you look at the entire system a com-8t bearing is not the weakest link.
The spacer/shim that is in-between the 12mm bolt and the 1/2 boar of the bearing will be the first thing to give way with a metal bearing.
You need Teflon "PTFE" lined bearings. This is a must.
I didn't find the Aurora bearings in stock the few places I checked.
I was in a rush and Mc Masters-Carr had them.
CT Engineering has the 7/8 in stock. They made me a deal on them.
Unfortunately I had to send them back since I needed the 1'.
Good luck.
Later,
Don