Ball Scres from McMAster

Hi all,

I just got a couple ball screws from McMaster and the finish seems
rough in comparison to most other screws.

I have some ball screws that are shiny and bright, whereas these are
dark and rough.

The rolled screws I have from another project look much better in
comparison.

http://www.mcmaster.com/asp/enter.asp?partnum=5966K55

Is there something I'm not aware of about ball screws ?

If I didn't know better, I would bet that these were blanks before
being ground.

Comments ?

BTW, what would one expect to pay to have the ends turned to 12mm
about 3 inches long on one end and 1/2" long on the other ?

If it does not cost too much $$, I'd have them sent out instead of
pushing my 9" lathe to cut this stuff.


Dave