For is a new NSK ball screw with nut. It was in the original plastic bag, I just took it out for a picture.
Part Number on nut:
W2502WF-33P
00FY-0079
Shaft:
25mm thread diameter
16mm pitch
270mm of thread
357mm total length
25mm diameter bearing end
Thanks for looking!
Brown spot on flange is from a marker, it is not rust