EDISON SCREW

The 'Edison screw' fitting is a system of light bulb connectors, developed by Thomas Edison in 1909 under the Mazda trademark. The designation E''xx'' refers to the diameter in millimeters, e.g. E12 has a diameter of 12 mm.
In the US 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 230-240 volts AC domestic power, E27 and E14 are common sizes, although the Bayonet mount is also used.
Larger sizes (E39, E40) are used for higher powered lighting, generally for lamps of over 250 watts.

Contents

Edison screw cap fittings

See also

Edison screw cap fittings

Type	Size Ø	Name	IEC
E5	5mm	Lilliput Edison Screw (LES)	IEC 60061-1 (7004-25)
E10	10mm	Miniature Edison Screw (MES)	IEC 60061-1 (7004-22)
E12	12mm	Candelabra Edison Screw (CES)	IEC 60061-1 (7004-28)
E14	14-17mm	Small Edison Screw (SES)	IEC 60061-1 (7004-23)
E17 (110v)	14-17mm	(Intermediate) Small Edison Screw (SES)	IEC 60061-1 (7004-26)
E26 (110v)	26-27mm	(Medium) (one-inch) Edison Screw (ES)	IEC 60061-1 (7004-21A-2)
E27	26-27mm	(Medium) Edison Screw (ES)	IEC 60061-1 (7004-21)
E39	39mm	(Mogul) Giant Edison Screw (GES)
E40	40mm	(Mogul) Giant Edison Screw (GES)	IEC 60061-1 (7004-24)

See also

★ Bipin

★ Bayonet mount