h b tw t f r width- thickness ratio A A f G Ix Ixf Iy mm mm mm mm mm grade of flange × 102mm 2 × 10 2mm 2 kg/m ×104mm 4 ×10 4mm 4 ×10 4mm 4 HW100x100x6x8 100 100 6 8 8 4.88 S1 21.58 16 16.9 378 339.41 134 HW125x125x6.5x9 125 125 6.5 9 8 5.69 S1 30 22.5 23.6 839 758.42 293 HW150x150x7x10 150 150 7 10 8 6.35 S1 39.64 30 31.1 1620 1472.50 563 HW175x175x7.5x11 175 175 7.5 11 13 6.43 S1 51.42 38.5 40.4