This National Hardware fine threaded steel rod works for hanging, connecting, clamping, and supporting in plumbing, heating and electrical applications and other do-it-yourself projects. Rod Diameter-Number of Threads = Safe Working Load (SWL)#10-32 = 300 lb1/4"-28 = 650 lb3/8"-24 = 1, 700 lb7/16"-20 = 2, 500 lb1/2"-20 = 2, 500 lb | HILLMAN 4006BC Steel Threaded Rod Fine Thread | Size 1/2"-20 x 36"