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