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Steel Tubes for Scaffolding Tubes Confirming to BS 1139 (Part-1)/1982 | |
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Dimensions and Tolerances for Welded Steel Tubes |
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Parameter |
Dimensions and Mass |
Tolerances |
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Outside Diameter |
48.3mm |
± 0.5mm |
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Thickness |
4.0mm |
Welded Tube + 0.8mm
- 0.4mm |
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Nominal mass per unit length
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4.37 kg/mtr. |
Single Tube max - 7.5%
Quantities of 150m and over ± 4% |
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Length |
if specified exact |
± 6.0mm |
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otherwise |
Random length of 4 to 7 Mtr. |
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Straightness |
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1/600 of length |
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Mechanical properties of the tubes: |
Chemical composition (ladle analysis) |
Tensile strengths 340 N/mm˛ to 460 N/mm˛
Yield Strength 210 N/mm˛ min
Elongation 22% min
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C 0.20% max
Si 0.30% max
P 0.060 % max
S 0.060 % max
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