Four pack of 5/8-8, ACME, coupling nut.  Right hand thread, low carbon steel, single start. 7/8 hex flats x 2.125 inch long. Moves .125 inch per re

4 pack, 5/8-8 ACME, coupling nut.  Right hand thread, low carbon steel, single start. 5/8 hex flats x 1.25 inch long.

Moves .1 inch per revolution of the nut.

Used to join two pieces of acme rod to form a longer length.

Acme rod not included with this item.