ISO 18388:2016规定了轴和孔的一系列卸压槽，用于机械工程中的一般用途。 它还打算通过限制槽类型和尺寸版本的选择来避免不必要的工具多样性。 注:G型和H型卸压槽的形状和尺寸符合ISO 6987中的“可转位硬质材料嵌件”。

ISO 18388:2016 specifies a series of relief grooves for shafts and holes, intended for general use in mechanical engineering. It also intends to avoid unnecessary multiplicity of tools by a restricted selection of groove-types and dimensional versions. NOTE The shape and the dimensions of the relief grooves type G and H correspond with the "Indexable hard material inserts" according to ISO 6987.