四个班；材料的化学和物理性质；实心和开口销尺寸为1/16 x 3/8英寸至7/8 x 8英寸；与非首选参考号相比，参考号更大。附录中关于钻孔尺寸选择的数据。交叉引用:BS 122BS 240:第1BS 970部分

Four classes; chemical and physical properties of the material; solid and split pin dimensions from 1/16 x 3/8 in to 7/8 x 8 in; reference by larger diameter compared with non-preferred reference by number. Data on selection of drill sizes in appendices.Cross References:BS 122BS 240:Part 1BS 970