Steel coupling nut for joining two pieces of 1/4"-20 UNC threaded rod end-to-end, or extending an existing bolt with another bolt of matching thread. Zinc plating provides general-purpose corrosion resistance for indoor and protected-outdoor installations.

• Thread: 1/4"-20 UNC (20 threads per inch, coarse)
• Length: 7/8" (short coupling for tight clearances)
• Across flats: 1/2" hex (uses standard 1/2" wrench or socket)
• Material: low-carbon steel, zinc plated
• Hillman/Steelworks MPN 11843
• 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.