by mercurial » 2 Sep 2007 2:58
First, are you sure the locks are in fact SFIC?
Just because you see the typical 'figure of 8' shaped cylinder insert does not mean that it is an SFIC lock - many padlocks(incl American) allow removal of the core via a small screw (sometimes hex screw, sometimes phillips/torx head) under the shackle.
If they are in fact using SFIC, then it is, as already mentioned for security reasons - because, if a key is lost it is a simple matter to swap the core out and insert a new one, without need for calling in a locksmith, provided somebody onsite has a basic knowledge of SFIC systems. This can be done VERY quickly, minimising any window of opportunity in which the padlock is vulnerable to use of the lost/misplaced key.
As far as failure of SFIC locks, I am only speculating, but I'd say the most likely issue is keys failing due to wear at the tip of the key, for example the BEST SFIC cores require 1/1000th of an inch tolerance. The keys are tip stopped (as opposed to most pin-tumbler keys, which are shoulder stopped). If the tip of a key wears away, you can make the key work by pulling it slightly out of the plug, until the bitting lines up correctly with the pin chambers. The other wear and tear that occurs in other pin-tumbler locks will also apply (the pins slowly wearing down through insertion and removal of the key being the most frequent failure).
Even if the prison has locks that have failed, I doubt very much that they will part with them, they likely have their own unique key profile, and to protect the integrity of the system, it is important to restrict access to blanks and locks that fit this profile.
...Mark
