7006-28A-1 No Go Gauge for E27 Caps on Finished Lamps IEC60061-3

IEC60061-3: 7006-28A-1 No go gauge for E27 Caps on Finished Lamps

Purpose: 
To check the minimum outside (major) diameter of the screw thread, dimension "d" of E27 caps on finished lamps shown on sheet 7006-21.

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.