Great for do-it-yourself projects, this National Hardware steel threaded rod has a coarse thread designed for hanging, connecting, clamping, and supporting in plumbing, heating, and electrical applications. Rod Diameter-Number of Threads = Safe Working Load (SWL)#6-32 = 200 lb#8-32 = 250 lb#10-24 = 300 lb1/4"-20 = 650 lb5/16"-18 = 1, 000 lb3/8"-16 = 1, 700 lb1/2"-13 = 3, 100 lb5/8"-11 = 4, 500 lb3/4"-10 = 6, 750 lb7/8"-9 = 10, 000 lb1"-8 = 12, 000 | HILLMAN 4000BC Steel Threaded Rod Coarse Thread | Size 1/2"-13 x 24"