尺寸，整体式钻头，包括导向和铰刀钻头以及具有适当硬度等级的碳化钨钻头。钻头材料和槽、杆节、直线度和互换性要求。交叉引用:BS 240:第1BS 970部分:第1BS 970部分:第2BS 970部分:第3BS 1090BS 1723部分

Dimensions, one-piece bits including pilot and reamer bits and tungsten carbide tips with appropriate hardness grades. Materials and slot for bit, pitch of rod, straightness, and interchangeability requirements.Cross References:BS 240:Part 1BS 970:Part 1BS 970:Part 2BS 970:Part 3BS 1090BS 1723