Steel grade recommendation

[Bob Korves]

The definitive threading operation for this job is to roll the thread. Rolling the thread makes it harder and smoother which is highly desirable in a puller application…Dave.

Agreed, Dave, and less stress risers, too.

 

[whitmore]

I have a small production run of specialized gear pullers I'd like to make and one of the parts

I plan to use hex stock and I have a box tool to turn the diameter and a die head to make the threads!

It could be most economical to fabricate it by starting with allthread (rolling is a very inexpensive way to make strong,
good quality threads) and pressing/brazing/epoxying a square or hex head. Hex is good to drive with a socket
wrench, square is good with an open-end wrench.