Standard Household Light Bulb Base Size

Numbers in a bulb code indicate size in millimeters or eighths of an inch.

Standard household light bulb base size.

Look at your fixture to determine its base type. Most light bulbs screw into a socket. 1 888 455 2800 fax 1 508 363 2900. The a series light bulb is the classic glass light bulb shape that has been the most commonly used type for general lighting service gls applications since the early 20th century.

The number that follows the a designation indicates the nominal major diameter of the bulb either in one eighth. Fluorescent pin bases miniature bipin medium bipin single pin recessed double contact 4 pin single ended 4 pin 2gx 13 axial twist lock bases 10mm gu10 10mm gx10 24mm gu24 bi pin bases 4mm g4 4mm gu4 4mm gz4 5 3mm g5 3 5mm g5 5 3mm gu5 3 5 3mm gx5 3 5 3mm gy5 3 6 35mm g6 35 6 35mm gy6 35 6 35mm gz6 35 8mm gy8 8 5mm g8 5 9mm g9 9mm g9 pin. Medium standard base code. Pin type bases are normally used for track lighting landscape bulbs.

They are commonly used for general lighting in standard light fixtures such as ceiling lights lamps can lights outdoor spotlight and flood light fixtures and vanity lights. It has a pear like shape and is typically fitted to either an edison screw or a bayonet cap base. Common bulbs with e26 e27 bases. The light bulb commonly used since the early 20th century for general purpose lighting applications with a pear like shape and an edison screw base is referred to as an a series light bulb this most common general purpose bulb type would be classed as a19 e26 or the metric version a60 e27.

Almost all household bulbs have a medium screw base sometimes called an edison screw 1 16 inches in diameter with 7 threads per inch. These are known as light bulb codes. The letter or letters in a bulb code indicate either shape or special features such as reflector type. Most common light bulb uses including lamps recessed flush mount flood lights are going to have one of the first three base types shown above.

Bulbs with a base that looks like a medium base but isn t are made to defeat bulb thieves in public places. Look at your fixture to determine its base type. Household light bulbs bases. Screw bases come in several sizes and they are referred to by both a descriptive name and size.

Browse our extensive selection of standard light bulbs and find the right size brightness and color for your needs. The candelabra e12 has a diameter of 12 millimeters. Our household light bulb types include a range of options for a variety of applications including energy efficient led versions that save time money and energy due to their long life.