Pin stacks series#

Finally, the total pin stack must equal 23. Since we already have '5' loaded into the bottom chamber, an '8' pin is required to reach 13 (13-5 = 8).

The control key operates a second plug dia which is 10 numbers higher than the control key cut (10+3 = 13). Therefore the total bottom pins loaded into the chamber would be '5' (4+1 = 5). The difference between cuts for the change key and master key is '4' (5-1 = 4). In our example, the highest cut between the change key and master key is '1'. Pin number totals in each chamber must total 23. American Lock, Arrow, Best, Master Lock, Peaks, Sargent, Schlage, Marks Hi Security & Scorpion/CX5 are among the companies offering cylinders pinned to an A2 key system. 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.Д®ach manufacturer who offers LFIC cylinders has their own cylinder design and their own cylinder pinning rules.

Pin stacks 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.Д«ecause 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.