直径不超过200mm的圆形硬化钢或花岗岩工具制造商扁钢，以及直径为250mm和400mm的圆形铸铁或花岗岩高精度表面板。材料、总体设计、表面处理、精度、包装、包装和标记。典型钢、铸铁和热处理的成分。交叉引用:BS 427:第1BS 860部分BS 1133:第6节取代BS 869:1939。

Circular hardened steel or granite toolmakers' flats up to 200 mm diameter and circular cast iron or granite high precision surface plates 250 and 400 mm diameter. Material, general design, finish, accuracy, cases, packing and marking. Composition of typical steels, cast irons and heat treatment.Cross References:BS 427:Part 1BS 860BS 1133:Section 6Replaces BS 869:1939.