When the gauge is placed over the thread of the cap on a finished lamp, held cap uppermost, the centre contact shall not project beyond surface X.
当量规套在成品灯(灯头向上)的灯头螺纹上时，灯头中心触点不应凸出量规的X面。
When the gauge is placed over the thread of the cap on a finished lamp, held cap uppermost, the centre contact shall not project beyond surface "X".
当量规套在成品（灯头向上）的灯头螺纹上时，灯头中心触点不应凸出X面。
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