公制尺寸，长度可达8000 mm弓形和5000 mm I型截面。每种类型、材料、制造和设计有两个精度等级。随附推荐尺寸和试验方法。交叉引用:BS 817BS 863BS 1133:第6BS 1133节:第19BS 1452BS 2795节:第1部分

Metric sizes in lengths up to 8000 mm bow shaped and 5000 mm I section. Two grades of accuracy for each type, material, manufacture, design. Recommended dimensions and test methods appended.Cross References:BS 817BS 863BS 1133:Section 6BS 1133:Section 19BS 1452BS 2795:Part 1