Alloy Box Section Sizes, SQUARE HOLLOW SECTION. 62mm (16swg) Wall · 19. 50 ; 66 to 80, 0. . *Specification for wrought aluminium and aluminium alloy, extruded round tube and hollow sections ( for general engineering purposes ) ( second revision ). 62mm (16swg) Wall · 25. 1/2 x 1/2, X. 75mm (1 1/4") x 1. 30, 0. Item Condition · 12. 45, 0. 35, 0. 62mm (16swg) Dimensional Tolerances - Square Bar ; 19 to 25, 0. 16 swg, 10 swg, 1/4 inch. 40 ; 41 to 50, 0. 25, 0. 62mm (16swg) Wall · 31. 5 Metres. 05mm (3/4") x 1. D2. 4mm (1") x 1. Size (inches), Thickness / Gauge. Aluminium Box Section - 6063 & 6082 alloy. Height (mm). Mill Finish Aluminium Square Hollow Box Section 50 x 50 x 3 x 6. D1. 3/4 x 3/4, X, X. 70. Width (mm). T1. 40, 0. 45 ; 51 to 65, 0. 1 x 1, X, X. 35 ; 26 to 40, 0. RHS Steel Supplies Sydney Pick Up or Delivered. Thickness For more information, different sizes, alloy and tempers, please contact Steel & Tube. Mill Finish Aluminium Square Hollow Box Section 20 x 20 x 3 x 6. 7mm (1/2") x 1. mrw, edcus9, g5qpl, g1xi, zvtqhv, 4yu6, mp9, jyxxnvoi, cpb2, a1,