Comparing One Key System vs. Two Different Cylinders for Home Front Door Security

Hello,

I wanted to know your opinion on the system of one key (one key for two locks) in the front door of the house / apartment. Is this a secure solution, or is it better to use two cylinders from different manufacturers with different keys? The undoubted advantage of a single key system is just to have one key for the door, but is it worth it? I know that the topic is not about electronic security, but I am very curious about the opinion of professionals
Greetings.

The burglar, approaching the door, sees the locks. He does not know how the latches are inside, it will take him as long to open the first one as the second. Unless he has the keys and hits it right away. Certainly one key is a convenience.

Hello,

sharp wrote:

If you had a choice, then use two different, but completely different systems such as the Titan from Gerda and to it a patent cylinder, or better yet a side drilled cylinder.

I will do the same. I am referring to a two lock system with inserts. One cylinder with a keyhole on both sides, and the other, on one side with a knob. Now comes the second question... Which cylinders (with which keys) to choose? Which are, at least theoretically, difficult to open?

Greetings.

The basis is the appropriate sign and the length of the cylinder adjusted to be flush with the sign or protruding up to 1mm, then difficult to break. The cylinder in the old "C" class, apparently now is a class "7" company if you like Italy is ISEO and abroad you have WILKA or home-made GERDA. When I was working on locks it was the longest time to come down precisely with the class "C". The cylinder itself is of little use if the door does not have the appropriate anti-balance hardware and hinges, the most common view of a hinge screwed in without security screws and without anti-balance hardware, using an ampoule wrench you could dismantle such a secured door in half an hour. Just a T-shirt "lock repair" and no one would even ask where the owner....

While in an apartment in a block of apartments it makes sense to have a class C burglar door and two good locks (different) and, of course, an alarm (I had a SATEL CA-10), in a detached house such a door can of course be, but the intruder will still choose a balcony/terrace window and not a solid front entrance door.
In a bungalow, however, I would use a single key system. A lock that is almost impossible to open especially by home professionals is the EVVA 3 KS system. Other locks can also be, but remember: the key profile must be protected and the ability to make a key ONLY on the basis of a code card; the card number should not be stamped on the key. Do an experiment and try to make such a key EVVA 3KS or other - if they make for you, I would be surprised (for 3KS there is supposedly one central service in Warsaw) and if they make without a code card, it is already a failure.


Added after 4 [minutes]:

I used to look around the internet for videos of how to open locks of different manufacturers (see locksmithing) and recently someone opened EVVA 3 KS, but it took him a very long time.

Hello,

JerzyR wrote:

As far as it makes sense in an apartment in a block of apartments to have a class C burglar-proof door and two good locks (different)

Apparently yes, but for an apartment in a block of apartments must be a class C door ? Isn't class B enough ? Looking at KMT's offerings, the door grades between B and C probably differ only in that C has a steel truss inside, a wooden frame around the edge of the door and perhaps two additional bolts.


Class B doors:




Class C doors:





Class C cylinders and anti-tamper locks can be installed for both models.
It is known that a class C door will be better, but on the other hand, looking at it, will anyone try to balance or cut the door on the staircase in the block of apartments?

On the other hand, certainly a class B door (with a structure like the one shown above) will certainly be much better than the doors installed "standard" in apartments with cardboard inside and clapboard outside.

Greetings.

Class C doors are required by insurers to get a discount

Hello,

JerzyR wrote:

Class C doors are required by insurers to get a discount

It probably depends on which company In my case it was enough that I had C-class locks, no one asked about the doors. I also got a discount

Greetings.