A 6-pin A2 master key system will generate 4096 change keys and every key combination can be used. The A2 SFIC system is very popular since there are no maximum adjacent cut problems. To simplify reading the charts, in most cases except as indicated, the master key cuts are 111111, control key cuts are 333333 and change key cuts are 555555. Missing from this list are Assa, Medeco and Peaks which require individual articles because of their complexity. The following charts show some of the mathematic rules for pinning popular SFIC and LFIC cylinders. In many cases a locksmith will be asked to rekey an interchangeable core cylinder he or she is not familiar with. Key blank heights from other lock manufacturers were too large to fit within the confines of the "Best" figure 8 core, so they designed a new breed of large format interchangeable core (LFIC) cylinders.Įach manufacturer who offers LFIC cylinders has their own cylinder design and their own cylinder pinning rules.
KWIKSET MASTER KEY SYSTEM SERIES
This required a new series of key blade shapes. The small format interchangeable core (SFIC) system invented by Frank Best proved to be the most practical solution for fitting a removable cylinder into a 1 1/4" diameter hole.īecause of cylinder diameter restrictions, the key blank height also had to be reduced. There were other cylinder removal inventions but most were limited to mortise cylinders and involved removing the whole round cylinder while leaving only a thin shell in the door.
Frank Best is usually recognized as the man who put interchangeable core on the map.
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