Steel coupling nut for joining two pieces of 5/8"-11 UNC threaded rod end-to-end, or extending an existing bolt with another of matching thread. Heavier section length (2-1/8") matches the larger thread diameter for full engagement and rated strength. Zinc plating provides general-purpose corrosion resistance for indoor and protected-outdoor installations.

• Thread: 5/8"-11 UNC (11 threads per inch, coarse)
• Length: 2-1/8" (extended for full thread engagement on larger rod)
• Across flats: 7/8" hex (uses standard 7/8" wrench or socket)
• Material: low-carbon steel, zinc plated
• Hillman/Steelworks MPN 11848
• 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.