E Thread DIN 40400
Edison Thread

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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