Image Oxygen and Acetylene Welding Hose Nut Markets Maintenance Repair Operations (MRO) Product Options Part Number Length Size Thread Material 1520309N 0.63" 9/16" RH Nut 9/16"-18 RH UNF C360 Brass 1540309N 0.63" 9/16" LH Nut 9/16"-18 LH UNF C360 Brass 1520306N 0.47" 3/8" RH Nut 3/8"-24 RH UNF C360 Brass 1540306N 0.47" 3/8" LH Nut 3/8"-24 LH UNF C360 Brass