Home screw cap is generally what model
Household screw cap is generally used in the model is E27. E refers to the thread type, 27 is the diameter of the lamp cap is about 27mm
The screw cap is a kind of lamp cap, the advantages of the screw cap can be firmly fixed on the socket, is the threaded connection. The accuracy requirements for lamp and socket machining are lower than those of bayonet.
The disadvantage is that when the installation must be connected in accordance with the requirements of the two lines on the socket, that is, phase line to connect the center of the lamp, the neutral line to the lamp head shell is mainly for safety needs, to prevent the screw shell live.
Early screw cap style is relatively simple, easy to rust, and now through continuous innovation, nice, long life, more effective, easy to install.