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    Locking Systems
Arguably the most important part of a Window but which is the best?    
 
The locking system is arguably the most important part of a window. They can look good but if they don’t stop the burglars they are less that useless. A Lock is made up of some or all of the following parts:-
They are known as locking systems as they normally constitute more that one part. below is a short history of locking systems Cockspur - 1 Point Locking
Espagnolette - 2 Point Locking The handle on espag locking systems have a spline the attached to a gear box situated in the eurogrove of a PVC Windows. This in turn operated 2 mushroom bolts that lock to 2 keeps on the outerfame
Shootbolts - Multipoint Locking
Window Keeps.
Dog or SAC bolts These are bolt and attach the the jam of the window and can look very secure. However are not totally necessary as most modern hinges have the same feature, don’t get drawn into too many security advantages of dog bolt. Summery of lock manufactures
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This is a very early type of locking system and is still used on some wooden and aluminum windows today. It constitutes just a single handle attached to the windows sash with a spur at 90 degrees that locks on the the window outerframe. The only security is the single point of the spur.
This the most commonly used locking system in the double glazing industry however don’t think that you will be getting this as standard i can make at least half a dozen manufactures that still only use Espag locking as standard. A shootbolt locking system is just an Espag lock with extension that wrap around the corners of the sash and when locked extend up into the outerframe.
These are also very important as a the strength of any locking system is only as strong as it’s weakest link. The Window keeps are screwed to the window frame and take the locking points. If these are make of plastic it won’t take much to pries them open. Don’t confuse plastic with new composite materials as some of these can be as strong as metal and stop the reaction between 2 difference metals. So check with the manufacture.
