This revision of BS 4848 : Part 2 has been prepared under the direction of the Piping Systems Components Standards Pollcy Committee. It supersedes SS 4848 : Part 2 : 1975 which is withdrawn.
It is intended that BS 4848 will ultimately comprise five Parts, each Part will cover different section shapes, as follows.
Part 1 Beams, columns and. tee bars
Part 2 Hot-finished hollow sections
Part 3 Channels
Part 4 Equal and unequal angles
Part 5 Bulb flats
ThIs Part of BS 4848 gives the requirements for tolerances and sectional properties for hot-finished structural steel hollow sections and gives the sectional properties for a range of sizes and thicknesses. The range of sizes and thicknesses has been selected from ISO 657 : Part 14 published by the International Organization for Standardization (ISO) but includes some additional sizes and thicknesses. Other sizes and thicknesses contained in ISO 657 : Part 14 but not specified In this standard are given in appendix A and may be available, as well as other intermediate thicknesses to those listed, by special order from the manufacturer. If the purchaser specifies such hollow sections In his enquiry or order it is recommended that he states the size and that he Indicates that the hollow sections should comply with all the requirements other than size and/or thickness, of SS 4848 : Part 2 Including tolerances.
For circular sections, square sections up to and Including 120 mm x 120 mm and rectangular sections up to and including 160 mm x 80 mm the geometric properties given in this standard are the same as those given In ISO 657 : Part 14. For both square and rectangular sections above the limits of 120 mm x 120 mm and 160 mm x 80 mm respectively the geometric properties given In this standard differ from those In ISO 657 : Part 14 because of differences In the corner radius used for their calculation. ISO 657 : Part 14 does not give geometric properties for sections greater than 10 mm thick.
