SQUARE HOLLOW SECTIONS


Square Steel Tubes


Square hollow sections or square tubes are cold formed and welded from either hot rolled, cold rolled, pre-galvanized or stainless steel.

In order to form the square steel section the appropriate mother tube, a round steel tube, has to be formed first. From a round tube rolls are used that progressively press the round tube into a square hollow section. This is all done inline. For example: A round tube with an outside diameter of 50.8 is pressed into a 40x40 square tube.

Square and rectangular steel tubes have the advantage of being stronger in bending while a round hollow sections has more stiffness in twisting.

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Square Hollow Section Moment of Inertia Calculator

B: mm
H: mm
b: mm
h: mm

Enter values above to calculate Moment of inertia

Square hollow sections dimensions and properties

 Designation
 h*b*t

 m                    A                       I                           Ze                    Zpl  r                   J
 mm  kg/m  10^3mm^2  10^6mm^4  10^3mm^3  10^3mm^3  mm  10^6mm^4
 50x50x3.0  4.48  0.533  0.190  7.59  9.17  18.9  0.322
 3.5  5.18  0.6098  0.211  8.43  10.3  18.6  0.364
 4.0  5.87  0.681  0.229  9.15  11.4  18.3  0.403
 4.5  6.55  0.750  0.244  9.77  12.3  18.0  0.438
 60x60x3.0  5.42  0.653  0.344  11.5  13.7  23.0  0.573
 3.5  6.28  0.749  0.386  12.9  15.5  22.7  0.652
 4.0  7.12  0.841  0.423  14.1  17.2  22.4  0.727
 4.5  7.96  0.929  0.256  15.2  18.8  22.2  0.796
 63x63x3.0  5.70  0.689  0.403  12.8  15.3  24.2  0.668
 3.5  6.60  0.791  0.453  14.4  17.3  23.9  0.761
 4.0  7.50  0.889  0.498  15.8  19.2  23.7  0.850
 4.5  8.38  0.984  0.538  17.1  21.0  23.4  0.932
 75x75x3.0  6.81  0.833  0.705  18.8  22.2  29.1  1.15
 3.5  7.90  0.959  0.797  21.3  25.3  28.8  1.32
 4.0  8.98  1.08  0.882  23.5  28.2  28.6  1.48
 4.5  10.0  1.20  0.961  25.6  31.0  28.3  1.63
 5.0  11.1  1.31  1.03  27.5  33.6  28.0  1.77
 100x100x3.0  9.17  1.13  1.75  35.0  40.8  39.3  2.80
 3.5  10.7  1.31  2.00  39.9  46.8  39.1  3.22
 4.0  12.1  1.48  2.23  44.6  52.6  38.8  3.63
 4.5  13.6  1.65  2.45  49.0  58.2  38.5  4.03
 5.0  15.0  1.81  2.66  53.1  63.5  38.3  4.42
 6.0  17.9  2.13  3.04  60.7  73.5  37.7  5.15
 120x120x3.0  11.1  1.37  3.10  51.6  59.8  47.5  4.89
 3.5  12.9  1.59  3.54  59.1  68.8  47.2  5.65
 4.0  14.6  1.80  3.97  66.2  77.5  47.0  6.39
 4.5  16.4  2.01  4.38  73.1  86.0  46.7  7.11
 5.0  18.2  2.21  4.78  79.6  94.2  46.4  7.82
 6.0  21.7  2.61  5.51  91.8  110  45.9  9.16
 152x152x3.5  16.3  2.04  7.41  97.4  113  60.3  11.7
 4.5  21.0  2.59  9.24  122  142  59.8  14.8
 6.0  27.8  3.33  11.3  150  178  58.2  18.4
 8.0  36.6  4.39  14.7  194  233  58.0  24.6
 10.0  45.3  5.34  17.3  227  277  56.9  29.6
 180x180x4.5  23.8  3.09  15.7  174  202  71.2  24.8
 6.0  31.5  4.05  20.1  223  262  70.5  32.4
 8.0  41.6  5.28  25.5  283  336  69.4  41.9
 10.0  51.6  6.46  30.2  335  404  68.4  50.7
 225x225x4.5  29.8  3.90  31.3  278  320  89.6  49.0
 6.0  39.5  5.13  40.5  360  418  88.8  64.3
 8.0  52.3  6.72  51.8  461  541  87.8  83.8
 10.0  64.9  8.26  62.2  553  656  86.8  102
 250x250x4.5  34.8  4.35  43.3  347  398  99.8  67.5
 6.0  46.2  5.73  56.2  450  521  99.0  88.7
 8.0  61.2  7.52  72.3  578  676  98.0  116
 10.0  76.0  9.26  87.1  697  822  97.0  142
 270x270x4.5  35.5  4.71  54.9  407  467  108  85.3
 6.0  47.1  6.21  71.4  529  611  107  112
 8.0  62.3  8.16  92.1  682  795  106  147
 10.0  77.4  10.1  111  824  969  105  180
 300x300x4.5  39.0  5.25  75.9  506  579  120  118
 6.0  51.8  6.93  98.9  660  760  119  155
 8.0  68.7  9.12  128  853  991  118  203
 10.0  85.3  11.3  155  1030  1210  117  250