There are many different types of lampshade fittings, which means that there are many different types of lamps. Without knowing what type of fitting your light bulb has you cannot pick out a matching fitting for your shade. It is important to know the different shapes and sizes so you can buy shades with the right size socket ring or harp. If you go shopping for shades without knowing what kind of lamp they will be used on it can lead to frustration as most manufacturers do not list this type of information on the product page; they assume everyone knows this stuff!

Here are some common styles:

Socket Ring (Pendant / Suspension Fittings)

Type A – Uses small round metal fastener (i.e. twist-on wire cap or screw-on washer)

Type B – Uses small round metal fastener (i.e. twist-on wire cap or screw-on washer)

Type C – A ring of metal that is twisted down onto a threaded base to hold it in place.

Socket Fitting with Slotted Contacts/ Screw Terminals Type G – Used on the larger incandescent lamps, uses two contact screws and a slotted contact piece which can be adjusted to meet either parallel or perpendicular electrical contacts.

Socket Fitting without Slotted Contacts/ Screw Terminals Type D – Like type G but omits the slotted contact comb. Uses one set of parallel contacts only.Type E – Has two contacts that are crossed instead of one set of parallel contacts. Used on some fluorescent lamps.

Sockets with Slotted Contacts/ Screw Terminals Type H – This type is the same as G, but has only one contact screw.

Type I – Like H but omits the slotted contact piece. No clearance for ventilation between body and wire cap or washer; may be unsuitable for use in dusty environments where contaminants might accumulate on exposed lamp terminals resulting in partial shorts against the socket wall if not properly ventilated (i.e., no holes in metal sockets).

Socket Fitting without Contacts (i.e.: Bayonet Mount) Type J – A bayonet mount;screws onto threads molded onto the base of a fluorescent lamp.

Type K – A spring clip that snaps over two tube prongs to keep them in contact with each other. Used on compact fluorescent, linear fluorescent and some incandescent lamps.

Socket Fitting with Insulating Collar Type M – Similar to type H but has an insulating collar between body & wire cap/washer which eliminates spark hazard if arm is accidentally touched during lamp change.

Socket Fitting without Contacts (i.e.: Cordset Socket-in-Lid) Type N – A porcelain socket mounted inside the metal lid of a porcelain light fixture or lantern body; usually screwed into the threaded opening in the lid. The string sets inside the body are connected to the socket terminals by one or more pins.

Socket with Contacts in Protective Enclosure Type P – A standard medium base lamp socket with contacts housed in a protective glass envelope.

Socket Fitting with Detachable Contact Screw (i.e.: Bayonet Mount) Type R – Has no insulating collar; usually has only one contact screw used for bayonet-type bulbs, i.e., compact fluorescent and some small incandescent lamps.

Socket Fitting without Contacts (i.e.: Cordset Socket-in-Lid) Type S – Similar to type N but designed for use in porcelain light fixtures where voltage is too low (< 25V)to make metal contacts work properly.

Socket Fitting without Contacts (i.e.: Cordset Socket-in-Lid) Type T – A porcelain socket mounted inside the metal lid of a porcelain light fixture or lantern body; usually screwed into the threaded opening in the lid. The string sets inside the body are connected to the socket terminals by two pins.

Socket with Contacts in Protective Enclosure Type R – Standard medium base lamp socket with contacts housed in a protective glass envelope.

Socket Fitting without Contacts (i.e.: Cordset Socket-in-Lid) Type U – Similar to type S but designed for use only where voltage is too low (< 25V)to make metal contacts work properlySocket Fitting without Contacts (i.e.: Cordset Socket-in-Lid) Type V – Porcelain socket mounted inside the molded plastic body of a porcelain light fixture or lantern body; usually screwed into the threaded opening in the lid. The string sets inside the body are connected to the socket terminals by two pins

Socket with Contacts in Protective Enclosure Type Z – Similar to type R but designed for use only where voltage is too low (< 25V)to make metal contacts work properly.

. Socket Fitting with Contacts in Protective Enclosure Type AC – A standard medium base lamp socket with contacts housed in a protective glass envelope.

Socket Fitting without Contacts (i.e.: Cordset Socket-in-Lid) Type AD – Porcelain socket mounted inside the molded plastic body of a porcelain light fixture or lantern body; usually screwed into the threaded opening in the lid. The string sets inside the body are connected to the socket terminals by two pins.

Socket with Contacts in Protective Enclosure Type AE – Standard medium base lamp socket with contacts housed in a protective glass envelope.

Type AJ- is like R but designed for use only where voltage is too low (< 25V)tomake metal contacts work properly.

Socket Fitting without Contacts (i.e.: Cordset Socket-in-Lid) Type AM – Similar to type AD but designed for use only where voltage is too low (< 25V)to make metal contacts work properly.

Socket Fitting with Contacts in Protective Enclosure Type AP – A standard medium base lamp socket with contacts housed in a protective glass envelope.

Socket Fitting with Contacts in Protective Enclosure Type AU – A standard medium base lamp socket with contacts housed in a protective glass envelope.

Socket Fitting with Contact Screw (i.e.: Bayonet Mount) Type B – Has no insulating collar; has one or more contact screws on the side of theThe most common types of lampshade fittings used in today’s marketplaces are:type A, C, D, E, H and I [the ones that do not attach via screwterminals]. The rarest types of lamp shade fittings are types P, Q, T and U [the ones that have a threaded screw terminal with insulation surrounding the outside of the threading]

-Type A: a single light socket for a light bulb with a straight cord.

-Type C: a three-way light socket with two different sockets connected to one switch.

-Type D: a porcelain lug/socket style electrical connector with an attached wiring harness consisting of an insulated wire leads and terminals used in low voltage applications such as Christmas lights. It has snap on contacts.

-Type E: similar to type H but omits the slotted contact piece. No clearance for ventilation between body and wire cap-Type H: a porcelain tube-style connector used in low voltage applications such as Christmas lights.

-Type I: has a threaded screw terminal with insulation surrounding the outside of the threading.

-Type J: a porcelain lug/socket style electrical connector with an attached grounding lead for use in low voltage applications such as Christmas lights. It has spring loaded clip contact.

-Type K: similar to type E but omits the slotted contact piece. No clearance for ventilation between body and wire cap.

-Type L: a porcelain socket mounted inside the molded plastic body of a light fixture or lantern body; usually screwed into the threaded opening in the lid. The string sets inside the body are connected to the socket terminal.

-Type Q: a porcelain tube-style connector used in low voltage applications such as Christmas lights. Has spring loaded pins for clip contact.

-Type R: is like type P but designed for use only where voltage is too low (< 25V)to make metal contacts work properly.

-Type S: has two different sockets connected to one switch and an insulated wire leads and terminals used in low voltage applications such as Christmas lights. It has snap on contacts.

-Type T: similar to type H but omits the slotted contact piece. No clearance for ventilation between body and wire cap.

-Type U: a threaded screw terminal with insulation surrounding the outside of the threading.

-Type V: has no insulating collar; has one or more contact screws on the side of the base.

-Type W: has two different sockets connected to one switch and is designed for use only where voltage is too low (< 25V)to make metal contacts work properly.

-Type X: similar to type E but omits the slotted contact piece. Has clearance for ventilation between body and wire cap.

Type Y: a threaded screw terminal with insulation surrounding the inside of the threading.

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