指定液压润滑管嘴的类型并确定其尺寸。为了便于润滑机器零件，建议限制螺纹接头的类型和尺寸，以避免使用过多的润滑脂泵。

Specifies the types of hydraulic lubrication nipples and lays down their dimensions. To facilitate the lubrication of machine parts, it is recommended that the number of types and dimensions of nipples be limited in order to avoid the use of too great a number of grease-pumps.