Component Hole 零件孔 指板子上零件脚插装的通孔，这种脚孔的孔径平均在 40 mil 左右。现在SMT盛行之后，大孔径的插孔已逐渐减少，只剩下少数连接器的金针孔还需要插焊，其余多数 SMD 零件都已改采表面粘装了。
此种方法亦可应用于其它一些机械零件孔中心距的测量。
This method can be applied to the measuring of centre distance of holes in other machine elements.
真空状态下，有利于零件孔内空气排出及清洗液的渗入，收到更佳清洗效果。
In the situation of vacuum, facilitate the discharging of the air of the accessories 'holes the infiltration of cleaning solution, received better cleaning effect.
真空状态下，有利于零件孔内空气排出及清洗液的渗入，收到更佳清洗效果。
In the situation of vacuum, facilitate the discharging of the air of the accessories 'holes and the infiltration of cleaning solution, received better cleaning effect.
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