Direct answer
E10, E12 and E14 are Edison screw base families with different thread diameters. The number roughly indicates the base diameter in millimeters. Choose by the actual socket size first, then confirm voltage, wattage, glass envelope and application.
Comparison table
| Base | Typical meaning | Buyer note |
|---|---|---|
| E10 | Small screw base around 10 mm | Common in miniature, indicator, flashlight and decorative lamps |
| E12 | Small candelabra screw base around 12 mm | Often used in appliance, decorative and specialty lamps |
| E14 | Small Edison screw base around 14 mm | Common in appliance, tubular and decorative bulbs |
How to identify
Measure the metal screw diameter on the old bulb or socket.
Check whether the socket depth matches the replacement bulb length.
Read the old voltage and wattage marking instead of relying on base size alone.
Confirm whether the product is incandescent, LED or another lamp type when the application is heat-sensitive.
Buyer checks
Confirm base diameter and thread type.
Confirm voltage and wattage from the old bulb, fixture label or equipment manual.
Check bulb shape and length for appliance or decorative covers.
Confirm by RFQ when the old bulb only shows partial markings.
Confirm by RFQ
Base family does not prove full compatibility. Confirm by RFQ when socket size, voltage, wattage, envelope shape or operating environment is uncertain.
Common mistakes
Assuming E12 and E14 fit each other because both are small screw bases.
Ignoring overall length in ovens, refrigerators or decorative housings.
Ordering by voltage only while missing wattage and heat requirements.
FAQ
Does E14 fit an E12 socket?
No. E14 and E12 are different screw sizes and should be matched to the actual socket.
Is E10 only for low voltage?
Not always. Many E10 bulbs are low voltage, but buyers should confirm the printed voltage or equipment requirement.
Which base should I choose for appliance bulbs?
Use the original bulb marking and socket size. Appliance use may also require fixture-specific size and heat review.
Sources and limits
- AOTENG product catalog - Product and specification reference
- AOTENG procurement support - RFQ and sourcing guidance
