BS 1139 Scaffolding Tube

Carbon	≤0.20
Silicon	≤0.30
Phosphorus	≤0.05
Sulphur	≤0.05
Nitrogen	≤0.009

Mechanical Property

Tensile strength	Rm	N/mm2	≥340; ＜480
Yield stress	ReH	N/mm2	≥235
Elongation	A		≥24%
(on Lo = 5.65√So)ª

Nominal dimensions, mass and tolerances for tubes

Tube	Nominal values "Type 4.0"	Tolerances
Wall thickness	4.0mm	－10.0%
Outside diameter(including ovality)	48.3mm	±0.5mm
Inside diameter	40.3mm	－2.6mm
Mass, single tube	4.37kg/m	+12.0%; －8.0%
Mass, batches of tubes(10 tonnes or more)	4.37kg/m	±7.5%

Abstract from Tianjin Xinyue Steel Group