Porcelain lamp socket types

Lamp holder E27, E14, E12, E26 are very popular in our daily life, “E” at the beginning is usually: screw socket, GU10 Gu at the beginning for our daily use of the bayonet. GU: G said lamp type is a plug-in, you said lamp presents a U shape, the numbers behind said lamp foot hole center distance (mm, mm).

Porcelain lamp holder is constructed of ceramic, screw shell, contact.
Body material Porcelain ceramic
Screw shell Nickel-plated copper 0.5mm thickness, Aluminum plated copper,
Contact Nickel-plated copper 0.8mm thickness, Stain steel, Iron plated copper.
Available cord 0.75mm2, 0.5mm2.

Porcelain lamp socket types

Porcelain lamp sockets, also known as light sockets or lamp holders, are used to securely hold and provide electrical connections for light bulbs. They’re made from porcelain due to its excellent insulating properties. Below are the different types of porcelain lamp sockets, which are named after the type of bulb they’re designed to hold:

  1. Edison (E-series) Socket: Also known as screw-in sockets, these are the most common type of socket used in North America. The socket is named after the type of bulb it holds – the Edison bulb. Examples include E26 and E27, which are standard sizes for residential light bulbs.
  2. Candelabra (E12) Socket: This is a smaller version of the Edison socket designed to hold candelabra bulbs, which are smaller and used for decorative lighting.
  3. Bi-Pin Socket: These sockets have two pins that insert into the bottom of the bulb. They’re often used for bulbs like halogens or some types of LEDs.
  4. Bayonet Base Socket: Common in British and other countries’ appliances, this type of socket has two pins on the side of the bulb that lock into place when inserted and twisted.
  5. GU10 and GU24 Socket: These sockets have two pins that insert and twist into place, similar to the bayonet base. They are used for some types of halogen and LED bulbs.
  6. Mogul (E39/E40) Socket: These sockets are designed for larger, high-intensity bulbs often used in commercial or industrial settings.
  7. Intermediate (E17) Socket: These sockets are between the size of a standard Edison and a candelabra socket. They’re often used for appliance bulbs and some types of decorative lighting.

The type of socket you need depends on the bulb you’re using and the intended application of the light fixture. Always ensure the socket and bulb are compatible to prevent any potential electrical issues.

Porcelain keyless lamp holders

How to choose the right porcelain lamp socket, the tips as following:
A) surface treatment effect, color and sample plan according to the sampling plan
B) rated voltage, rated current, standard number, certification mark,
C) lamp model, voltage, current, certification marks a clear, complete screw cap mouth ring surface should clean and bright, should not wrinkle,
D) wires with smooth surface, no scratches, through parts no sharp edges, burrs, uniform insulation thickness, the thread processing reference samples (immersion tin, riveting terminal).
E) the wire is fixed and the screw is not dropped. Lamp shrapnel and hardware requirements without loosening, tilt, and lamp good contact,
F) no rusty surface, no cracks in thick material specifications to meet the requirements, the damage.


E27 F519 lamp holder


E27 socket, E39 lamp holder is refers to the ordinary screw lamp cap size, usually E27 socket is use incandescent lamp, E40 is bigger than e27 lamp holder, more use for the metal halide lamp and high-pressure sodium bulbs.

MR16 lamp holder: “MR” means multi-face reflect, many sided reflections (cup), “16” means bulb caliber (the unit is 1 / 8 inch), the caliber of MR16 socket:16×1/8=2 inch≈50mm, “MR” is the push-in lamp holder, two pins, usually use for the halogen lamps and led lamps, it’s very convenient to install.


light bulb socket sizes


GU10 lamp holder:  “GU” is the bayonet type. GU: “G” means lamp holder type is a plug-in, “U” means lamp is U shape, the “10” shows the center distance of lamp foot holes (mm). The good quality GU10 lamp holders with 15cm silicon wire,
Rated voltage & Amp at:    2A, 250V,
Contact: Nickel-plated copper,
Cable chooses: silica, braided, Teflon, high temperature resistant,
Available wire: 0.5 / 0.75 / 1mm2,
Body material: Ceramic body, metal fitting,
Certificate: UL, TUV, CE, RoHS.

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