To check the maximum dimensions of the screw thread and dimension T1 minimum of E26 caps on finished lamps.
When the cap on a finished lamp has been screwed into the gauge as far as it will go, the centre 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.
To check the minimum outside (major) diameter of the screw thread, dimension d, of E26 caps on finished lamps.
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.
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