HSS3x3x1/4 HSS3x3x1/4 Square HSS RHS 13.111 76.2 76.2 6.35 5.906 11.811 1570 13.1101 1254268 32920 40544 28.2607 1254268 32920 40544 28.2607 2128090 0.2845 0.2474 Pending verification – nominal dimensions entered by the application developer ASTM A500/A500M and AISC Shapes Database (square HSS) 2026-10-12 UNVERIFIED Outer corner radius 2.0 × design wall thickness (AISC convention) for property calculation; confirm against ASTM A500/A500M and AISC Shapes Database (square HSS) and the manufacturer catalogue. Typical grade: A500 Gr C.