QUOTE(supersound @ Apr 17 2014, 08:28 PM)
Have to got how many bar are used to lock your door. If just like normal door, I only need a 14KG cylinder to break open the door.
Avoid using WD40 on all cost, use silicone lubricant are better
I saw a few supplier most of their locks mechanism are top bottom and side , with some offered at higher premiums will have lock on top side and bottom side as well.
However, from my observation, these lock mechanisms are all inter-connected, means once you turn the key, all the locks (top+bottom+side) will retract to the frame and lock itself. So in other way to look at it, say if a theft with good knowledge on opening the door with pins or whatever device, just by turning the key direction, all the locks will unlock itself. Does it mean that no matter how many locks we buy (be it top bottom side top side bottom side) it will still be the same?
Unless it's like side you have one set of individual key lock, maybe top + bottom another set of individual key lock, the theft will surely have a rough time to open the door aint it?
Anyway just sharing my thoughts here. Not trying to say anything bad about the security door though. Of course we hope there's not much of profesional theft around here.. Coming back to the original question of the durability after going through this whole topic, some pointed out to avoid al-cheapo type, some having experience have to remove the whole security door due to faulty locks etc, it really makes me wonder should i venture into security doors. After some good pointers by supersound and cstkl1 , all we need is just to lubricant the locking mechanism part? Not too tough for a lubricating maintenance job.