How to identify E12
- Look for E12 printed on the bulb or packaging.
- Measure straight across the metal screw base, not around it.
- Compare the base with a U.S. dime: E12 is noticeably narrower.
Where it is commonly used
Common use is a clue, not proof. The fixture label and model documentation take priority over a visual match.
Bulb shapes sold with this base
You may see these shapes with a E12 base. The base code does not guarantee the bulb width, length, beam angle, or clearance.
Before you buy a replacement
- Do not confuse E12 with the slightly larger European E14 base.
- Check whether the fixture needs a flame-tip, torpedo, or globe shape.
- Stay at or below the fixture's maximum wattage.
Quick answers
Questions about the E12 bulb base
What is a E12 bulb base?
E12 is the small screw base commonly used in decorative U.S. fixtures. The 12 refers to the approximate thread diameter in millimeters.
What size is a E12 bulb base?
E12 has a nominal 12 mm diameter. Measure straight across the threaded metal base. Use the printed base code when available because a visual estimate is not conclusive.
Where is a E12 bulb base commonly used?
Common examples include chandeliers, wall sconces, night lights, ceiling fans. Fixture type is only a clue; confirm the code on the bulb, socket, fixture label, or manufacturer documentation.
Can I choose a E12 replacement by appearance alone?
No. Match the E12 connection first, then verify voltage, actual input wattage, bulb dimensions, fixture restrictions, controls, and any enclosure or location rating required by the installation.
Is E12 the same as a candelabra base?
In North American product listings, candelabra base commonly refers to the E12 screw base. Confirm the printed E12 code or nominal 12 mm diameter because a small screw base that looks similar may be E14 or another size.