目的：
PURPOSE:
檢驗成品燈上E26，E26/50X39，E26/51X39或E26d燈頭螺紋外徑（尺寸d）。
To check the minimum outside (major) diameter of the screw thread, dimension d, of E26, E26/50x39, E26/51x39 or E26d caps on finished lamps.
檢驗：
TESTING:
當(dāng)量規(guī)套在成品燈（燈頭向上）的燈頭螺紋上時，燈頭中心觸點不凸出X面。
檢驗僅利用量規(guī)的自身質(zhì)量進行。
When the gauge is placed over the thread of the cap on a finished lamp, held cap uppermost, the central contact shall not project beyond surface X.
Only the weight of the gauge itself shall be used in the test.
_____________________________________________________________
目的：
PURPOSE:
檢驗成品燈上的E26燈頭的螺紋尺寸和值尺寸T1。
To check the maximum dimensions of the screw thread and dimension T1min of E26, E26/50x39, E26/51x39
or E26d caps on finished lamps.
檢驗：
TESTING:
當(dāng)成品燈上的燈頭完全旋入量規(guī)內(nèi)時，燈頭中心觸點應(yīng)與X面接觸。當(dāng)燈從量規(guī)中取出時，至少應(yīng)旋入兩整圈才能脫離螺紋。
When the cap on a finished lamp has been screwed into the gauge as far as it will go, the central contact
shall touch surface X. When the lamp is removed from the gauge, at least two full turns shall be required to disengage
the threads.
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