5/8-11 yc g8 hex nut. Coarse thread. Heat-treated yellow dichromate. Grade 8. Thread Type: Coarse, Thread Diameter: 5/8", Threads Per Inch: 11 tpi, Finish: Yellow Dichromate, Pkg Qty: 25 No. 180418: Thread Type: Coarse, Thread Diameter: 3/4", Threads Per Inch: 10 tpi, Finish: Yellow Dichromate, Pkg Qty: 20