What material grade of screw is used on the hardtail vise? I know it is 1-1/4"-5 ACME, but is it like ASTM grade B7? low carbon? Just curious.
Also, what types of thrust bearings are used? Like 3-piece thrust ball bearings, one piece ball bearings, needle roller, tapered roller, etc. I know there is a very large difference in both price and load and RPM ratings between different styles.
The screws are roll formed, the material gets noticeably harder during the process. Hardness equivalent to a grade 8 bolt