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This reference provides dimensions and theoretical weights for mild steel round tubes, square tubes, and rectangular tubes. The tables include metric and imperial dimensions, wall thicknesses, and theoretical weight values to help compare tube sizes and estimate material requirements.
The table below lists round mild steel tube sizes by outside diameter (OD) and wall thickness (t), with metric and imperial equivalents and theoretical weight per meter and per foot.
Theoretical Weight Calculation Formula:
Weight (kg/m) = 0.0246615 × (D − t) × t
Where:
D = Outside diameter (mm)
t = Wall thickness (mm)
Steel density = 7.85 g/cm³
| Outside Diameter (OD - Imperial) | Wall Thickness (t - Metric) | Wall Thickness (t - Imperial/Gauge) | Nominal Weight (kg/m) | Nominal Weight (lb/ft) |
|---|---|---|---|---|
| 1/2" (0.500 in) | 1.0 mm | 20 Ga (0.035 in) | 0.289 | 0.194 |
| 1/2" (0.500 in) | 1.2 mm | 18 Ga (0.049 in) | 0.34 | 0.228 |
| 1/2" (0.500 in) | 1.5 mm | 16 Ga (0.065 in) | 0.414 | 0.278 |
| 5/8" (0.625 in) | 1.2 mm | 18 Ga (0.049 in) | 0.434 | 0.292 |
| 5/8" (0.625 in) | 1.5 mm | 16 Ga (0.065 in) | 0.532 | 0.357 |
| 5/8" (0.625 in) | 2.0 mm | 14 Ga (0.083 in) | 0.685 | 0.46 |
| 3/4" (0.750 in) | 1.2 mm | 18 Ga (0.049 in) | 0.528 | 0.355 |
| 3/4" (0.750 in) | 1.5 mm | 16 Ga (0.065 in) | 0.649 | 0.436 |
| 3/4" (0.750 in) | 2.0 mm | 14 Ga (0.083 in) | 0.841 | 0.565 |
| 1.000 in | 1.2 mm | 18 Ga (0.049 in) | 0.716 | 0.481 |
| 1.000 in | 1.5 mm | 16 Ga (0.065 in) | 0.884 | 0.594 |
| 1.000 in | 2.0 mm | 14 Ga (0.083 in) | 1.154 | 0.775 |
| 1.000 in | 3.0 mm | 11 Ga (0.120 in) | 1.657 | 1.113 |
| 1-1/4" (1.250 in) | 1.5 mm | 16 Ga (0.065 in) | 1.119 | 0.752 |
| 1-1/4" (1.250 in) | 2.0 mm | 14 Ga (0.083 in) | 1.467 | 0.986 |
| 1-1/4" (1.250 in) | 3.0 mm | 11 Ga (0.120 in) | 2.127 | 1.429 |
| 1-1/2" (1.500 in) | 1.5 mm | 16 Ga (0.065 in) | 1.354 | 0.91 |
| 1-1/2" (1.500 in) | 2.0 mm | 14 Ga (0.083 in) | 1.781 | 1.197 |
| 1-1/2" (1.500 in) | 3.0 mm | 11 Ga (0.120 in) | 2.597 | 1.745 |
| 1-1/2" (1.500 in) | 4.0 mm | 8 Ga (0.165 in) | 3.364 | 2.261 |
| 2.000 in | 1.5 mm | 16 Ga (0.065 in) | 1.824 | 1.226 |
| 2.000 in | 2.0 mm | 14 Ga (0.083 in) | 2.407 | 1.617 |
| 2.000 in | 3.0 mm | 11 Ga (0.120 in) | 3.536 | 2.376 |
| 2.000 in | 4.0 mm | 8 Ga (0.165 in) | 4.617 | 3.102 |
| 2.000 in | 6.0 mm | 1/4 in (0.250 in) | 6.629 | 4.454 |
| 2-3/8" (2.375 in) | 2.0 mm | 14 Ga (0.083 in) | 2.875 | 1.932 |
| 2-3/8" (2.375 in) | 3.0 mm | 11 Ga (0.120 in) | 4.239 | 2.848 |
| 2-3/8" (2.375 in) | 4.0 mm | 8 Ga (0.165 in) | 5.554 | 3.732 |
| 2-3/8" (2.375 in) | 5.0 mm | 3/16 in (0.188 in) | 6.819 | 4.582 |
| 3.000 in | 2.0 mm | 14 Ga (0.083 in) | 3.66 | 2.459 |
| 3.000 in | 3.0 mm | 11 Ga (0.120 in) | 5.416 | 3.639 |
| 3.000 in | 4.0 mm | 8 Ga (0.165 in) | 7.122 | 4.786 |
| 3.000 in | 6.0 mm | 1/4 in (0.250 in) | 10.387 | 6.98 |
| 3-1/2" (3.500 in) | 3.0 mm | 11 Ga (0.120 in) | 6.355 | 4.27 |
| 3-1/2" (3.500 in) | 4.0 mm | 8 Ga (0.165 in) | 8.375 | 5.628 |
| 3-1/2" (3.500 in) | 6.0 mm | 1/4 in (0.250 in) | 12.266 | 8.243 |
| 4.000 in | 3.0 mm | 11 Ga (0.120 in) | 7.295 | 4.902 |
| 4.000 in | 4.0 mm | 8 Ga (0.165 in) | 9.628 | 6.47 |
| 4.000 in | 6.0 mm | 1/4 in (0.250 in) | 14.146 | 9.506 |
| 4.000 in | 8.0 mm | 5/16 in (0.312 in) | 18.466 | 12.408 |
| 4-1/2" (4.500 in) | 3.0 mm | 11 Ga (0.120 in) | 8.234 | 5.533 |
| 4-1/2" (4.500 in) | 4.0 mm | 8 Ga (0.165 in) | 10.88 | 7.311 |
| 4-1/2" (4.500 in) | 6.0 mm | 1/4 in (0.250 in) | 16.025 | 10.768 |
| 4-1/2" (4.500 in) | 8.0 mm | 5/16 in (0.312 in) | 20.972 | 14.093 |
| 5-1/2" (5.500 in) | 4.0 mm | 8 Ga (0.165 in) | 13.386 | 8.995 |
| 5-1/2" (5.500 in) | 6.0 mm | 1/4 in (0.250 in) | 19.783 | 13.294 |
| 5-1/2" (5.500 in) | 8.0 mm | 5/16 in (0.312 in) | 25.983 | 17.46 |
| 5-1/2" (5.500 in) | 10.0 mm | 3/8 in (0.375 in) | 31.986 | 21.503 |
| 6-5/8" (6.625 in) | 4.5 mm | 7 Ga (0.180 in) | 18.178 | 12.215 |
| 6-5/8" (6.625 in) | 6.0 mm | 1/4 in (0.250 in) | 24.015 | 16.137 |
| 6-5/8" (6.625 in) | 8.0 mm | 5/16 in (0.312 in) | 31.625 | 21.251 |
| 6-5/8" (6.625 in) | 10.0 mm | 3/8 in (0.375 in) | 39.038 | 26.232 |
| 8-5/8" (8.625 in) | 6.0 mm | 1/4 in (0.250 in) | 31.531 | 21.188 |
| 8-5/8" (8.625 in) | 8.0 mm | 5/16 in (0.312 in) | 41.648 | 27.986 |
| 8-5/8" (8.625 in) | 10.0 mm | 3/8 in (0.375 in) | 51.566 | 34.651 |
| 8-5/8" (8.625 in) | 12.7 mm | 1/2 in (0.500 in) | 64.63 | 43.429 |
| 10-3/4" (10.750 in) | 6.0 mm | 1/4 in (0.250 in) | 39.507 | 26.547 |
| 10-3/4" (10.750 in) | 8.0 mm | 5/16 in (0.312 in) | 52.281 | 35.131 |
| 10-3/4" (10.750 in) | 10.0 mm | 3/8 in (0.375 in) | 64.859 | 43.584 |
| 10-3/4" (10.750 in) | 12.7 mm | 1/2 in (0.500 in) | 81.508 | 54.771 |
| 12-3/4" (12.750 in) | 6.0 mm | 1/4 in (0.250 in) | 47.038 | 31.608 |
| 12-3/4" (12.750 in) | 8.0 mm | 5/16 in (0.312 in) | 62.321 | 41.878 |
| 12-3/4" (12.750 in) | 10.0 mm | 3/8 in (0.375 in) | 77.411 | 52.017 |
| 12-3/4" (12.750 in) | 12.7 mm | 1/2 in (0.500 in) | 97.447 | 65.482 |
The table below lists square mild steel structural tubing by section dimensions and wall thickness, with metric and imperial equivalents and theoretical weight per meter.
Theoretical Weight Calculation Formula:
Weight (kg/m) = 0.0157 × (2A − 2.86t) × t
Where:
A = Outside side length (mm)
t = Wall thickness (mm)
The formula accounts for an assumed outer corner radius of R = 1.5t.
| Section Dimensions (Metric A × A) | Section Dimensions (Imperial A × A) | Wall Thickness (t - Metric) | Wall Thickness (t - Imperial/Gauge) | Nominal Weight (kg/m) | Nominal Weight (lb/ft) |
|---|---|---|---|---|---|
| 15 x 15 mm | 1/2" x 1/2" | 1.2 mm | 18 Ga (0.049 in) | 0.499 | 0.335 |
| 15 x 15 mm | 1/2" x 1/2" | 1.5 mm | 16 Ga (0.065 in) | 0.605 | 0.407 |
| 20 x 20 mm | 3/4" x 3/4" | 1.2 mm | 18 Ga (0.049 in) | 0.687 | 0.462 |
| 20 x 20 mm | 3/4" x 3/4" | 1.5 mm | 16 Ga (0.065 in) | 0.841 | 0.565 |
| 20 x 20 mm | 3/4" x 3/4" | 2.0 mm | 14 Ga (0.083 in) | 1.077 | 0.724 |
| 25 x 25 mm | 1" x 1" | 1.5 mm | 16 Ga (0.065 in) | 1.076 | 0.723 |
| 25 x 25 mm | 1" x 1" | 2.0 mm | 14 Ga (0.083 in) | 1.391 | 0.935 |
| 25 x 25 mm | 1" x 1" | 3.0 mm | 11 Ga (0.120 in) | 1.951 | 1.311 |
| 30 x 30 mm | 1-3/16" x 1-3/16" | 1.5 mm | 16 Ga (0.065 in) | 1.312 | 0.882 |
| 30 x 30 mm | 1-3/16" x 1-3/16" | 2.0 mm | 14 Ga (0.083 in) | 1.705 | 1.146 |
| 30 x 30 mm | 1-3/16" x 1-3/16" | 3.0 mm | 11 Ga (0.120 in) | 2.422 | 1.628 |
| 40 x 40 mm | 1-1/2" x 1-1/2" | 1.5 mm | 16 Ga (0.065 in) | 1.783 | 1.198 |
| 40 x 40 mm | 1-1/2" x 1-1/2" | 2.0 mm | 14 Ga (0.083 in) | 2.333 | 1.568 |
| 40 x 40 mm | 1-1/2" x 1-1/2" | 3.0 mm | 11 Ga (0.120 in) | 3.364 | 2.261 |
| 40 x 40 mm | 1-1/2" x 1-1/2" | 4.0 mm | 8 Ga (0.165 in) | 4.306 | 2.894 |
| 50 x 50 mm | 2" x 2" | 2.0 mm | 14 Ga (0.083 in) | 2.961 | 1.99 |
| 50 x 50 mm | 2" x 2" | 3.0 mm | 11 Ga (0.120 in) | 4.306 | 2.894 |
| 50 x 50 mm | 2" x 2" | 4.0 mm | 8 Ga (0.165 in) | 5.562 | 3.738 |
| 50 x 50 mm | 2" x 2" | 5.0 mm | 3/16 in (0.188 in) | 6.72 | 4.516 |
| 60 x 60 mm | 2-3/8" x 2-3/8" | 2.0 mm | 14 Ga (0.083 in) | 3.589 | 2.412 |
| 60 x 60 mm | 2-3/8" x 2-3/8" | 3.0 mm | 11 Ga (0.120 in) | 5.248 | 3.527 |
| 60 x 60 mm | 2-3/8" x 2-3/8" | 4.0 mm | 8 Ga (0.165 in) | 6.818 | 4.582 |
| 60 x 60 mm | 2-3/8" x 2-3/8" | 5.0 mm | 3/16 in (0.188 in) | 8.289 | 5.57 |
| 80 x 80 mm | 3" x 3" | 3.0 mm | 11 Ga (0.120 in) | 7.132 | 4.792 |
| 80 x 80 mm | 3" x 3" | 4.0 mm | 8 Ga (0.165 in) | 9.33 | 6.27 |
| 80 x 80 mm | 3" x 3" | 5.0 mm | 3/16 in (0.188 in) | 11.429 | 7.68 |
| 80 x 80 mm | 3" x 3" | 6.0 mm | 1/4 in (0.250 in) | 13.445 | 9.035 |
| 100 x 100 mm | 4" x 4" | 3.0 mm | 11 Ga (0.120 in) | 9.015 | 6.058 |
| 100 x 100 mm | 4" x 4" | 4.0 mm | 8 Ga (0.165 in) | 11.842 | 7.958 |
| 100 x 100 mm | 4" x 4" | 5.0 mm | 3/16 in (0.188 in) | 14.569 | 9.79 |
| 100 x 100 mm | 4" x 4" | 6.0 mm | 1/4 in (0.250 in) | 17.213 | 11.567 |
| 100 x 100 mm | 4" x 4" | 8.0 mm | 5/16 in (0.312 in) | 22.181 | 14.905 |
| 120 x 120 mm | 4-3/4" x 4-3/4" | 4.0 mm | 8 Ga (0.165 in) | 14.354 | 9.646 |
| 120 x 120 mm | 4-3/4" x 4-3/4" | 5.0 mm | 3/16 in (0.188 in) | 17.709 | 11.9 |
| 120 x 120 mm | 4-3/4" x 4-3/4" | 6.0 mm | 1/4 in (0.250 in) | 20.981 | 14.099 |
| 120 x 120 mm | 4-3/4" x 4-3/4" | 8.0 mm | 5/16 in (0.312 in) | 27.205 | 18.281 |
| 150 x 150 mm | 6" x 6" | 5.0 mm | 3/16 in (0.188 in) | 22.419 | 15.065 |
| 150 x 150 mm | 6" x 6" | 6.0 mm | 1/4 in (0.250 in) | 26.633 | 17.896 |
| 150 x 150 mm | 6" x 6" | 8.0 mm | 5/16 in (0.312 in) | 34.741 | 23.345 |
| 150 x 150 mm | 6" x 6" | 10.0 mm | 3/8 in (0.375 in) | 42.453 | 28.527 |
| 200 x 200 mm | 8" x 8" | 6.0 mm | 1/4 in (0.250 in) | 36.053 | 24.227 |
| 200 x 200 mm | 8" x 8" | 8.0 mm | 5/16 in (0.312 in) | 47.301 | 31.785 |
| 200 x 200 mm | 8" x 8" | 10.0 mm | 3/8 in (0.375 in) | 58.153 | 39.077 |
| 200 x 200 mm | 8" x 8" | 12.0 mm | 1/2 in (0.500 in) | 68.621 | 46.111 |
| 250 x 250 mm | 10" x 10" | 6.0 mm | 1/4 in (0.250 in) | 45.473 | 30.557 |
| 250 x 250 mm | 10" x 10" | 8.0 mm | 5/16 in (0.312 in) | 59.861 | 40.225 |
| 250 x 250 mm | 10" x 10" | 10.0 mm | 3/8 in (0.375 in) | 73.853 | 49.627 |
| 250 x 250 mm | 10" x 10" | 12.5 mm | 1/2 in (0.500 in) | 90.724 | 60.964 |
| 300 x 300 mm | 12" x 12" | 8.0 mm | 5/16 in (0.312 in) | 72.421 | 48.665 |
| 300 x 300 mm | 12" x 12" | 10.0 mm | 3/8 in (0.375 in) | 89.553 | 60.177 |
| 300 x 300 mm | 12" x 12" | 12.5 mm | 1/2 in (0.500 in) | 110.35 | 74.152 |
The table below lists rectangular mild steel structural tubing by section dimensions and wall thickness, with metric and imperial equivalents and theoretical weight per meter and per foot.
Theoretical Weight Calculation Formula:
Weight (kg/m) = 0.0157 × (A + B − 2.86t) × t
Where:
A = Outside width of the section (mm)
B = Outside height of the section (mm)
t = Wall thickness (mm)
| Section Dimensions (Metric A × B) | Section Dimensions (Imperial A × B) | Wall Thickness (t - Metric) | Wall Thickness (t - Imperial/Gauge) | Nominal Weight (kg/m) | Nominal Weight (lb/ft) |
|---|---|---|---|---|---|
| 30 x 20 mm | 1-3/16" x 3/4" | 1.5 mm | 16 Ga (0.065 in) | 1.076 | 0.723 |
| 30 x 20 mm | 1-3/16" x 3/4" | 2.0 mm | 14 Ga (0.083 in) | 1.391 | 0.935 |
| 40 x 20 mm | 1-1/2" x 3/4" | 1.5 mm | 16 Ga (0.065 in) | 1.312 | 0.882 |
| 40 x 20 mm | 1-1/2" x 3/4" | 2.0 mm | 14 Ga (0.083 in) | 1.705 | 1.146 |
| 40 x 20 mm | 1-1/2" x 3/4" | 3.0 mm | 11 Ga (0.120 in) | 2.422 | 1.628 |
| 50 x 25 mm | 2" x 1" | 1.5 mm | 16 Ga (0.065 in) | 1.665 | 1.119 |
| 50 x 25 mm | 2" x 1" | 2.0 mm | 14 Ga (0.083 in) | 2.176 | 1.462 |
| 50 x 25 mm | 2" x 1" | 3.0 mm | 11 Ga (0.120 in) | 3.129 | 2.103 |
| 50 x 30 mm | 2" x 1-3/16" | 2.0 mm | 14 Ga (0.083 in) | 2.333 | 1.568 |
| 50 x 30 mm | 2" x 1-3/16" | 3.0 mm | 11 Ga (0.120 in) | 3.364 | 2.261 |
| 60 x 40 mm | 2-3/8" x 1-1/2" | 2.0 mm | 14 Ga (0.083 in) | 2.961 | 1.99 |
| 60 x 40 mm | 2-3/8" x 1-1/2" | 3.0 mm | 11 Ga (0.120 in) | 4.306 | 2.894 |
| 60 x 40 mm | 2-3/8" x 1-1/2" | 4.0 mm | 8 Ga (0.165 in) | 5.562 | 3.738 |
| 80 x 40 mm | 3" x 1-1/2" | 2.0 mm | 14 Ga (0.083 in) | 3.589 | 2.412 |
| 80 x 40 mm | 3" x 1-1/2" | 3.0 mm | 11 Ga (0.120 in) | 5.248 | 3.527 |
| 80 x 40 mm | 3" x 1-1/2" | 4.0 mm | 8 Ga (0.165 in) | 6.818 | 4.582 |
| 80 x 40 mm | 3" x 1-1/2" | 5.0 mm | 3/16 in (0.188 in) | 8.289 | 5.57 |
| 100 x 50 mm | 4" x 2" | 3.0 mm | 11 Ga (0.120 in) | 6.661 | 4.476 |
| 100 x 50 mm | 4" x 2" | 4.0 mm | 8 Ga (0.165 in) | 8.702 | 5.847 |
| 100 x 50 mm | 4" x 2" | 5.0 mm | 3/16 in (0.188 in) | 10.644 | 7.153 |
| 100 x 50 mm | 4" x 2" | 6.0 mm | 1/4 in (0.250 in) | 12.501 | 8.399 |
| 120 x 60 mm | 4-3/4" x 2-3/8" | 3.0 mm | 11 Ga (0.120 in) | 8.074 | 5.425 |
| 120 x 60 mm | 4-3/4" x 2-3/8" | 4.0 mm | 8 Ga (0.165 in) | 10.586 | 7.113 |
| 120 x 60 mm | 4-3/4" x 2-3/8" | 5.0 mm | 3/16 in (0.188 in) | 13 | 8.736 |
| 120 x 60 mm | 4-3/4" x 2-3/8" | 6.0 mm | 1/4 in (0.250 in) | 15.327 | 10.3 |
| 150 x 100 mm | 6" x 4" | 4.0 mm | 8 Ga (0.165 in) | 14.982 | 10.067 |
| 150 x 100 mm | 6" x 4" | 5.0 mm | 3/16 in (0.188 in) | 18.494 | 12.427 |
| 150 x 100 mm | 6" x 4" | 6.0 mm | 1/4 in (0.250 in) | 21.923 | 14.731 |
| 150 x 100 mm | 6" x 4" | 8.0 mm | 5/16 in (0.312 in) | 28.461 | 19.125 |
| 200 x 100 mm | 8" x 4" | 4.0 mm | 8 Ga (0.165 in) | 18.122 | 12.177 |
| 200 x 100 mm | 8" x 4" | 5.0 mm | 3/16 in (0.188 in) | 22.419 | 15.065 |
| 200 x 100 mm | 8" x 4" | 6.0 mm | 1/4 in (0.250 in) | 26.633 | 17.896 |
| 200 x 100 mm | 8" x 4" | 8.0 mm | 5/16 in (0.312 in) | 34.741 | 23.345 |
| 200 x 100 mm | 8" x 4" | 10.0 mm | 3/8 in (0.375 in) | 42.453 | 28.527 |
| 250 x 150 mm | 10" x 6" | 5.0 mm | 3/16 in (0.188 in) | 30.269 | 20.34 |
| 250 x 150 mm | 10" x 6" | 6.0 mm | 1/4 in (0.250 in) | 36.053 | 24.227 |
| 250 x 150 mm | 10" x 6" | 8.0 mm | 5/16 in (0.312 in) | 47.301 | 31.785 |
| 250 x 150 mm | 10" x 6" | 10.0 mm | 3/8 in (0.375 in) | 58.153 | 39.077 |
| 300 x 200 mm | 12" x 8" | 6.0 mm | 1/4 in (0.250 in) | 45.473 | 30.557 |
| 300 x 200 mm | 12" x 8" | 8.0 mm | 5/16 in (0.312 in) | 59.861 | 40.225 |
| 300 x 200 mm | 12" x 8" | 10.0 mm | 3/8 in (0.375 in) | 73.853 | 49.627 |
| 300 x 200 mm | 12" x 8" | 12.5 mm | 1/2 in (0.500 in) | 90.724 | 60.964 |
| 400 x 200 mm | 16" x 8" | 8.0 mm | 5/16 in (0.312 in) | 72.421 | 48.665 |
| 400 x 200 mm | 16" x 8" | 10.0 mm | 3/8 in (0.375 in) | 89.553 | 60.177 |
| 400 x 200 mm | 16" x 8" | 12.5 mm | 1/2 in (0.500 in) | 110.35 | 74.152 |
Round tubing is specified by its actual Outside Diameter (OD) and Wall Thickness:
Outside Diameter (OD): The external diameter measured across the tube body.
Wall Thickness: Specified in millimeters, decimal inches, or gauge numbers. Gauge-to-thickness conversions depend on the gauge system used.
Nominal Pipe Size (NPS / DN): Used for nominal pipe sizing (e.g., ASME B36.10M), where NPS 2 does not equal an actual 2.000-inch OD (actual OD is 2.375 inches / 60.3 mm).
Square Profiles: Designated as Width × Width × Wall (e.g., 50 × 50 × 3.0 mm).
Rectangular Profiles: Designated as Width × Height × Wall (e.g., 100 × 50 × 4.0 mm).
Calculation Note: The theoretical weight formulas for square and rectangular profiles in this guide use an assumed outer corner radius of (R = 1.5t) for mathematical modeling.
Length Conversion: 1 inch = 25.4 mm (exact).
Density Assumption: Theoretical weight calculations assume a nominal carbon steel density of 7.85 g/cm³ (7,850 kg/m³).
Mass Conversion: 1 kg/m = approximately 0.67197 lb/ft.
Mild steel tubes are available in three common structural profiles: circular, square, and rectangular hollow sections. The table below summarizes their typical size and wall thickness ranges.
| Profile Type | Size Range | Wall Thickness Range |
|---|---|---|
| Circular Hollow Section (CHS) | OD 21.3–1219 mm | 2.0–40.0 mm |
| Square Hollow Section (SHS) | 20 × 20–400 × 400 mm | 2.0–20.0 mm |
| Rectangular Hollow Section (RHS) | 40 × 20–500 × 300 mm | 1.5–20.0 mm |
For round tubes, dimensions are specified by outside diameter (OD) and wall thickness. Square and rectangular tubes are specified by their external width, height, and wall thickness. The size and weight charts above provide detailed dimensions and theoretical weights for each profile.
Q1. What Are the Standard Mild Steel Tube Sizes in mm?
Common sizes vary by profile. Round tubes are measured by outside diameter and wall thickness, while square and rectangular tubes use width × height × wall thickness. See the size charts above for available dimensions.
Q2. Are Mild Steel Tube Sizes Standardized?
Yes. Dimensions vary according to the applicable product standard, tube profile, and wall thickness.
Q3. What Wall Thicknesses Are Available for Mild Steel Tubes?
The listed ranges are 2–40 mm for circular tubes, 2–20 mm for square tubes, and 1.5–20 mm for rectangular tubes.
Q4. How Is Mild Steel Tube Weight Calculated?
For round tubes, use: Weight (kg/m) = 0.02466 × (OD − t) × t, where OD and t are in millimeters.
Mild Steel Pipe (MS Pipe): Specifications, Grades, Types & Applications
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