iPhone Screenshots


LFIC: Large Format Interchangeable Core Calculator

Automatically calculates the pinning charts for Corbin-Russwin (System 70 & Non-System 70), Sargent, and Medeco 32 Series.

Obeys required rules set by Corbin-Russwin, Sargent, and Medeco respectively.

Randomize function will generate completely random charts each time it is triggered while obeying any applicable MACS rules.

Easy to use interface: Every text field "autotabs" so there is no need to tap on every box.

Freeze inputs and functions by tapping the Lock/Unlock toggle to prevent unwanted changes.

MACS chart provided in information page for Medeco.

AirPrint or Email systems.

Compatibility: iPhone / iPod touch on iOS 8.0 or later and iPad on iOS 12.0 or later.

Found a bug? Something not working? Have a suggestion? Feel free to contact me via email.

What’s New

Version 1.3.1

-Added option to display build-up pin values for Corbin-Russwin driver pins

Ratings and Reviews

3.7 out of 5
3 Ratings

3 Ratings

YouAreAllNewJackBitches ,


I hated keying Corbin and Sargent FSIC before this app came about. Simply type in your depths and it does all the confusing math and spits out a pinning chart. This app has saved many handfuls of hair on my head

Phoenix,AZ ,

A "must have" for Facility Locksmiths!

Phillip D., you keep making incredibly useful apps in for the locksmith community. If you have a Sargent or Corbin large format system then you must get this. I encourage everyone I train on buying this app.

Developer Response ,

So glad you like! Thank you for your kind words!

Neomikin ,

Does not work in all situations

Does not work if your master key cuts are deeper than your control key cuts, returns negative pin numbers

Developer Response ,

If you're referring to Corbin Russwin (both sys70 and non-sys70) you will indeed return negative pin numbers any time the control bitting is less than a master or change bitting. This is how the these systems were designed. If you would like more information or need any help feel free to contact me.


Philip Domenici
2.8 MB

Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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