What is the reason why the lock cylinder of the security door becomes tighter in the spring

Dear, this has little to do with the anti-theft door brand. The reasons for the general tightening are as follows:

1. The internal structure of the lock cylinder becomes tighter, resulting in the twisting of the key tightening, this solution is relatively easy, use the lock cylinder lubricant (can also be replaced by 2B pencil lead powder) to put it in the key, and gently send it into the lock cylinder and twist it a few times;

2.If it is a marble lock cylinder, it is recommended to replace the lock cylinder, because the internal structure is seriously worn out, 3, it may also be because the door edge strip and the deadbolt are not well matched, resulting in the difficulty of the deadbolt to stretch out, the direct appearance is that the lock cylinder twists and tightens, in this way, you can try the door in the open state, if the door is not difficult to twist in the open state, it is the reason for the door, so you need to adjust the height and angle of the door. If it is difficult to twist, refer to the first two items to solve it.

Did mine help you?

I recommend a Saidian brand super B-level C-level double-sided blade idling explosion-proof lock cylinder supervised by the expert committee of China's lock industry, which is anti-technical opening, anti-tin foil, and anti-breaking, which is very good. As shown below: