Manufacturer part number:  W4406W-1D-UUPZ6.35

• 44mm diameter
• 6.35mm (1/4") lead
• 600mm of ball screw thread (this measure does not include the machined portion)
  
• Custom/non-standard end machining on one end as shown.  You should be able to machine to your requirement.  Other end is square cut.
• Would estimate 400mm of unimpeded travel for nut.
  
• Extreme precision ground, C1/C0 rated.
• Heavy duty double nut (zero backlash)
• Note that any mottling, discoloration or other aberrations in picture are GREASE applied to screw for shipping/storage.  NSK packs all of its products very carefully, and we removed this screw from factory packaging to photograph it.  It was wiped down a bit, but no attempt was made to completely clean it.  These NSK screws are factory new, factory perfect and absolutely BEAUTIFUL.