E-27 Base International Lamp Sockets

E-27 Base International Sockets also known as the Edison socket with big screw socket (27 millimeters). A bulb with an E27-socket will always have the same base but the shape of the bulb can, of course, differ. E26 stands for 26 mm and the E27 for 27 mm in diameter. These two standards are interchangeable, meaning a US E26 will fit in a European E27 base, and E27 will fit in a E26 base. The only difference is the voltage.  For Common Questions about Lamp Sockets click here.