Steel coupling nut for joining two pieces of 1/2"-13 UNC threaded rod end-to-end, or extending an existing bolt with another of matching thread. Zinc plating provides general-purpose corrosion resistance for indoor and protected-outdoor installations.

• Thread: 1/2"-13 UNC (13 threads per inch, coarse)
• Length: 1-3/4" (standard coupling length)
• Across flats: 3/4" hex (uses standard 3/4" wrench or socket)
• Material: low-carbon steel, zinc plated
• Hillman/Steelworks MPN 11847
• Sold individually (1 each)

Tip: Engage both rods at least half the coupler's length for full strength; thread the rod in until it just contacts the center witness mark or until equal thread shows on both ends.