确定术语并规定主要尺寸，以确保以下设备在系统A的限制范围内的互换性:钻杆和联轴器；套管、套管接头、套管钻头、套管鞋、驱动鞋和套管铰壳；取芯筒、取芯钻头、取芯升降机和扩孔壳体。规定了一系列设备的特性，用于钻孔直径为1.18英寸至7.88英寸，并产生直径为0.73英寸至6.5英寸的岩芯。

Establishes the nomenclature and lays down the leading dimensions to ensure interchangeability within the limits of system A of the following equipment: drill rods and couplings; casings, casing couplings, casing bits, casing shoes, drive shoes and casing ream shells; core barrels, core bits, core lifters and reaming shells. Specifies the characteristics of a range of equipment for drilling holes having diameters from 1.18 in to 7.88 in and yielding cores having diameters from 0.73 in to 6.5 in.