One piece 3/4-6 acme coupling nuts steel 7/8 hex x 2.125 long right hand

Single piece of 3/4-6 ACME, coupling nut.  Right hand thread, low carbon steel, single start. 7/8 hex flats x 2.125 inch long. Moves .125 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.