After looking for a screw & nut to build my new Z axis I had offered to me a few sets of these,
O/a length 275 mm x 19.5 mm dia, movement of nut is 120 mm @ 5 mm per turn, they have a 10 mm dia bearing surface each end.
These are old stock unused so like as new, all have a coat of oil but a little discolored in places.
Looking for £25 each plus post & packing, or collect.

Phill