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The Edison screw fitting is a system of light bulb connectors, developed by Thomas Edison
Thomas Edison

Thomas Alva Edison was an American inventor and businessman who developed many devices that greatly influenced life around the world, including the phonograph and the long-lasting, practical electric light bulb....
 in 1909 under the Mazda
Mazda (light bulb)

Mazda was a trademarked name used by General Electric and others for incandescent light bulbs from 1909 through 1945; Mazda brand light bulbs were made for decades after 1945 outside the USA....
 trademark. The designation Exx refers to the diameter
Diameter

In geometry, a diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints are on the circle....
 in millimeters, e.g. E12 has a diameter of 12 mm.

In the United States, the standard size for general purpose lamps is E26.






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Gluehlampe 01 Kmj
The Edison screw fitting is a system of light bulb connectors, developed by Thomas Edison
Thomas Edison

Thomas Alva Edison was an American inventor and businessman who developed many devices that greatly influenced life around the world, including the phonograph and the long-lasting, practical electric light bulb....
 in 1909 under the Mazda
Mazda (light bulb)

Mazda was a trademarked name used by General Electric and others for incandescent light bulbs from 1909 through 1945; Mazda brand light bulbs were made for decades after 1945 outside the USA....
 trademark. The designation Exx refers to the diameter
Diameter

In geometry, a diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints are on the circle....
 in millimeters, e.g. E12 has a diameter of 12 mm.

In the United States, the standard size for general purpose lamps is E26. Other base sizes are used for small lamps, such as E12 for candelabra fixtures and E10 on some Christmas lights
Christmas lights

The tradition of festive lighting for Christmas is a long standing tradition in many Christian countries, and has been adopted in secular fashion in a number of other cultures ....
. E17 is also common, especially in some table lamps.

In countries which use 220-240 volts AC
Alternating current

In alternating current the movement of electric charge periodically reverses direction. An electric charge would for instance move forward, then backward, then forward, then backward, over and over again....
 domestic power, E27 and E14 are the most common sizes, although the Bayonet mount
Bayonet mount

A bayonet mount or bayonet connector is a fastener that relies on mated surfaces; a male side with one or more pins or slots, and a female receptor with matching slots and a spring that maintains a clamping force....
 is also used.

Larger sizes (E39, E40) are used for higher powered lighting, generally for lamps of over 250 watts.

Some adapters for wall outlets use an Edison screw.

Edison screw cap fittings


Type Size ?
Diameter

In geometry, a diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints are on the circle....
 Name IEC
International Electrotechnical Commission

The International Electrotechnical Commission is a Non-profit organization, non-governmental international standards organization that prepares and publishes International Standards for all electrical, electronic and related technologies ? collectively known as "electrotechnology"....
E5 5 mm Lilliput Edison Screw (LES)IEC
International Electrotechnical Commission

The International Electrotechnical Commission is a Non-profit organization, non-governmental international standards organization that prepares and publishes International Standards for all electrical, electronic and related technologies ? collectively known as "electrotechnology"....
 60061-1 (7004-25)
E10 10 mm Miniature Edison Screw (MES)IEC
International Electrotechnical Commission

The International Electrotechnical Commission is a Non-profit organization, non-governmental international standards organization that prepares and publishes International Standards for all electrical, electronic and related technologies ? collectively known as "electrotechnology"....
 60061-1 (7004-22)
E11 11 mm Mini-Candelabra Edison ScrewIEC
International Electrotechnical Commission

The International Electrotechnical Commission is a Non-profit organization, non-governmental international standards organization that prepares and publishes International Standards for all electrical, electronic and related technologies ? collectively known as "electrotechnology"....
 60061-1 (7004-6-1)
E12 12 mm Candelabra Edison Screw (CES)IEC
International Electrotechnical Commission

The International Electrotechnical Commission is a Non-profit organization, non-governmental international standards organization that prepares and publishes International Standards for all electrical, electronic and related technologies ? collectively known as "electrotechnology"....
 60061-1 (7004-28)
E14 14-17 mm Small Edison Screw (SES)IEC
International Electrotechnical Commission

The International Electrotechnical Commission is a Non-profit organization, non-governmental international standards organization that prepares and publishes International Standards for all electrical, electronic and related technologies ? collectively known as "electrotechnology"....
 60061-1 (7004-23)
E17 (110v) 14-17 mm (Intermediate) Small Edison Screw (SES)IEC
International Electrotechnical Commission

The International Electrotechnical Commission is a Non-profit organization, non-governmental international standards organization that prepares and publishes International Standards for all electrical, electronic and related technologies ? collectively known as "electrotechnology"....
 60061-1 (7004-26)
E26 (110v) 26-27 mm (Medium) (one-inch) Edison Screw (ES)IEC
International Electrotechnical Commission

The International Electrotechnical Commission is a Non-profit organization, non-governmental international standards organization that prepares and publishes International Standards for all electrical, electronic and related technologies ? collectively known as "electrotechnology"....
 60061-1 (7004-21A-2)
E27 26-27 mm (Medium) Edison Screw (ES)IEC
International Electrotechnical Commission

The International Electrotechnical Commission is a Non-profit organization, non-governmental international standards organization that prepares and publishes International Standards for all electrical, electronic and related technologies ? collectively known as "electrotechnology"....
 60061-1 (7004-21)
E39 39 mm (Mogul) Giant Edison Screw (GES) 
E40 40 mm (Mogul) Giant Edison Screw (GES)IEC
International Electrotechnical Commission

The International Electrotechnical Commission is a Non-profit organization, non-governmental international standards organization that prepares and publishes International Standards for all electrical, electronic and related technologies ? collectively known as "electrotechnology"....
 60061-1 (7004-24)


See also

  • Bipin
    Bipin

    A bipin or bi-pin, , is a standard from the International Electrotechnical Commission for lamp fittings. These are used on many small incandescent light bulbs , and on most fluorescent lights as well, where the filaments are involved in starting the tube when it is turned on....
  • Bayonet mount
    Bayonet mount

    A bayonet mount or bayonet connector is a fastener that relies on mated surfaces; a male side with one or more pins or slots, and a female receptor with matching slots and a spring that maintains a clamping force....
  • MR16
    MR16

    MR16 is a standard format for Halogen bulb reflector lamps made by a variety of manufacturers. MR16-compatible LED lamps are also available. MR16 lamps are regularly used in place of compact fluorescent lamps or standard incandescent light bulbs for applications including residential lighting and retail lighting....
  • GU10
    GU10

    GU10 is a triple CD 10th anniversary release from Global Underground Ltd. celebrating their Global Underground series. Discs 1 and 2 feature tracks from the past ten years whereas the third features tracks produced from earlier....
  • Kovar
    Kovar

    Kovar is a nickel-cobalt ferrous alloy designed to be compatible with the thermal expansion characteristics of borosilicate glass in order to allow direct mechanical connections over a range of temperatures....
     material for joining bulb glass to metal