... , 14Ga, 13Ga42" 48" 54" 60" 66" 72" 78" 84" 90" 96"3" x 3" Welded15Ga, 14Ga, 13Ga3" x 3" Bolted15Ga, 14Ga ... ", 5", 5 1/2", 6", 6 1/4"48" 72" 92" 96" 100" 104" 108" 112"Stepeed Beams with Nosed 4 1 ... /3", 4 3/4", 5 1/2", 6 5/16"96" 108" 120" 144"Box Beams 3 1/8", 4" , 4 ... ", 4 3/4", 5 1/2", 6 5/16"48" 96" 108" 120" 132" 144"