To check the minimum outside (major) diameter of the screw thread, dimension "d" of E27 caps on finished lamps shown on sheet 7006-21.
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 itself shall be used in the test.
To check the maximum dimensions of the screw thread and dimension T1 minimum of caps on finished lamps shown on sheet 7004-2.
When the cap on a finished lamp has been screwed into the gauges as far as it will go, the centre contact shall be coplanar with, or project beyond surface X.
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