... -dipped galvanized after welding; -2 Hot-dipped galvanized before welding; -3 Electro galvanized after welding; -4 Electro galvanized before welding; -5 ... /4" × 1/4" 6.4mm × 6.4mm 22,23,24 3/8" × 3/8" 10.6mm × 10.6mm 19,20,21,22 1/2 ... ,19,20,21,22,23 5/8" × 5/8" 16mm × 16mm 18,19,20,21, 3/4" × 3/4" 19.1mm × 19.1mm 16 ...