Not go gauge for caps on finished lamps E17, 7006-28F-1

Not go gauge for caps on finished lamps E17, 7006-28F-1 

Purpose: 

To check the minimum outside (major) diameter of the screw thread, dimension d, of E17 caps on finished lamps. 

Testing: 

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.