目的：
PURPOSE:
检验GB/T1406.1-7004-21中成品灯上灯头螺纹尺寸和尺寸T1min。
To check the maximum dimensions of the screw thread and dimension T1 minimum of caps on finished lamps shown on sheet 7004-2.
检验：
TESTING:
当成品灯上的灯头完全旋入量规内时，灯头中心触点应与X面共面或者凸出X面。
When the cap on a finished lamp has been screwed into the gauges as far as it will go, the centre contact shall be co-planar with, or project beyond surface X.
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目的：
Purpose:
检验GB/T1406.1-7004-21成品灯上E27灯头螺纹外径（尺寸d）。
To check the minum outside (major) diameter of the screw thread, dimension "d" of E27 caps on finished lamps shown on sheet 7004-21.
检验：
Testing:
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。
检验仅利用量规的自身质量进行。
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".
Only the weight of the gauge iteself shall be used in the test.
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