Coupling Nuts are hexagonal shaped nuts with an extended body usually used to couple two studs together (also known as Extension Nuts).

-Coupling Nuts/Extension Nuts are machined from 12L14 cold finished hex bar stock.
-Used as a coupling nut with studs to lengthen bolts.
-Extra charge for case hardening.
Unit of Measure


Thread Size (in.)

N/A 3/8"-16

Width Across Flats (in.)

N/A 11/16

Length (in.)

N/A 1-1/8


N/A Stock Item