The name Edison thread for the socket of lamps traces back to Thomas Alva Edison.
Thread Size
Major Diameter mm
Tapping Drill Size mm
Pitch mm
E 5.5
5.5
4.9
1.0
E 10
10.0
8.8
1.81
E 14
14.0
12.5
2.82
E 16
16.0
14.7
2.50
E 18
18.0
17.0
3.00
E 27
27.0
24.5
3.62
E 33
33.0
30.8
4.23
E 40
40.0
36.3
6.35
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