Edison screw
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The Edison screw cap is a system of light bulb connectors, developed by Thomas Edison in the late 1800's.
The Edison screw system use Exx identification where 'xx' is the diameter in millimeters, e.g E26.
In America the standard size is E26, although E12 is used for candelabra fixtures and E10 on some Christmas lights. E17 is also common, especially in some table lamps.
In most countries which use 240 volts AC domestic power, example, Australia, E27 and E14 are very common sizes, althought the Bayonet mount is more popular.
Larger sizes, like E40, etc. are also commonly used, mostly for higher powered lighting, like streetlights and floodlighting.
[edit] Edison screw cap fittings
Type | Size (MM) | Name
E5 - 5mm - Lilliput Edison Screw LES
E10 - 10mm - Miniature Edison Screw MES
E12 - 12mm - Candelabra Edison Screw CES
E17 (E14 in countries using the 220 - 240 volt system) - 17-14mm - Small Edison Screw SES
E26 (E27 in countries using the 220 - 240 volt system) - 26-27mm - (Medium) Edison Screw ES
E40 - 40mm - Giant Edison Screw GES
