Universal, AN Fitting, Male -6AN Steel Weld Bung (9/16-18 SAE Thread; 7/8" Flange OD), Male -6AN Steel Weld Bung (9/16-18 SAE Thread; 7/8" Flange OD), STEEL WELD BUNGS, Weld Bungs, Vibrant Performance male AN bungs are available in both aluminum & mild steel and range from -4 to -20 AN thread sizes., -6ANMaleMSWeldBung.