Mastering IC Pin Stack Mathematics

Each IC lock manufacturer has its own pinning system. For locksmiths who service many different types of IC systems, it can be difficult to remember which pinning system to use.


Interchangeable core (IC) lock systems have been steadily gaining in popularity. IC locks were first brought to public attention by the Best Lock Company more than 70 years ago. Because IC cylinders can be immediately changed without major components being removed from the door, government...


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1) (A)= total of bottom and master pin numbers

2) (B)= Control key cut minus (A)

3) (C)= Top pin is same number as control key cut

Pinning: A+B+C

Note: C/R pin kits have special +/- control pin numbering plus special top pin numbering.

MEDECO

1) (A)= total of bottom and master pin numbers

2) no control pins are used

3) (B)= Top pin is same number as (A)

Pinning: A+B

Note: Medeco pin kits have special top pin numbering. Control key uses cuts three numbers higher than masterkey in spaces 3 & 4.

SARGENT (spaces 1,2,5,6)

1) (A)= total of bottom and master pin numbers

2) no control pins are used

3) (B)=15 minus (A) [top pin number]

Pinning: A+B

SARGENT (control lug spaces 3 & 4)

1) (A)= total of bottom and master pin numbers

2) (B)=”8” minus (A) (control pin number)

3) (C)- “20” minus (A) & (B) (top pin number)

Pinning: A+B+C

SCHLAGE

No special pinning is used. Schlage control keys are longer and contain one more space than all other keys in the masterkey system. Cuts on the control key are usually identical to the highest level master key. The extra space at the tip of the control key is usually a “6” depth to operate the cylinder retainer.

YALE

No special pinning is used. Yale control keys are longer and contain one more space than all other keys in the masterkey system. Cuts on the control key are usually identical to the highest level master key. The extra space at the tip of the control key is usually a “1” depth to operate the cylinder retainer.

Individual lock companies have differing rules for developing compatible control key cuts, master key cuts and change key cuts. Some combinations of key cuts may allow a change key to inadvertently operate the control key shearline. Check for possible interchanges whenever an IC cylinder is rekeyed.

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