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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
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Dimensions
and Mass
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Tolerances
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Outside Diameter
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48.3mm
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± 0.5mm
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Thickness
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4.0mm
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Welded Tube + 0.8mm
- 0.4mm
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Nominal mass per unit
length
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4.37 kg/mtr.
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Single Tube max - 7.5%
Quantities of 150m and over ± 4%
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Length
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if specified exact
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± 6.0mm
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otherwise
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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:
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Chemical
composition (ladle analysis)
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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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