(25) Hex Rod Couplings 5/8-11 Threaded Nut Connectors Zinc Go to amazon.com Related posts Top 7 recommendation coupling nut 5/8 for 2022 DescriptionLot Of (25) Hex Rod Connectors.These Zinc Plated All-Thread Couplings Are 5/8-11 Thread And Are 2-1/8" Long With A 13/16" Hex.