Sargent 6300 large format interchangeable cores (LFIC) utilize a control lug found in the 3rd and 4th chambers of the core. The Sargent 6300 utilizes the Sargent .020” key bitting specification that has depths 1-10 (shallowest to deepest), sometimes labeled 1-0, and requires two-step progression. Control keys for the Sargent 6300 will contain the same cuts as either the operating/change key OR top master key in all positions except the 3rd and 4th.
One big item to keep in mind is that the coded difference between the operating and control shearline is .160” or 8 increments. This means that certain control bittings used in conjunction with certain operating/change key OR top master key bittings can result in key interchange. In other words, operating/change OR top master keys functioning as control keys or vice-versa. Sargent avoids this risk with factory systems by not using depths 1 and 2 for control key bittings and depths 9 and 10 for operating/change OR top master key bittings in the 3rd and 4th positions. Please keep this in mind when servicing cores in the field. For further information on this topic, consult Chapter 12 of The Core of the Matter by A.J. Hoffman and Billy B. Edwards, Jr.
Additionally, the Sargent .020″ key bitting specification uses two step progression. This means that the control key and operating/change key and/or top master key bittings must all carry the same parity in their respective positions/chambers. You must follow this rule to avoid key interchange.
The control key typically shares the same cuts as the top master key in positions 1, 2, 5, and 6. This allows the control key to function in all cylinders in a master key system because chambers 1, 2, 5, and 6 will already be master pinned to operate with the top master key.
All Sargent 6300 cores manufactured after January 1, 2009 should utilize “hollow drivers” in control chambers. Hollow drivers have a portion of the driver/top pin “hollowed out” to accommodate special hollow driver springs. This re-design was to correct potential operational problems. Because control chambers have a uniform stack height that is 5 increments larger than non-control chambers, the 3rd and 4th chambers will be .100″ (5 x .020″) larger than non-control chambers. By removing a portion of the driver, the risk of crushing a spring in control-chambers is drastically reduced.
If you plan to service Sargent 6300s, you should obtain both hollow drivers and hollow driver springs. Contact your local distributor or consult page CK-14 in the 2018 Sargent price book for more information.
Pinning Chart Tools
We currently host three tools available to assist you with creating pinning charts for the Sargent 6300:
First, we have a pinning worksheet that contains a pinning chart and pinning instructions/rules for the Sargent 6300. This pinning worksheet, demonstrated in the video below, allows locksmiths to quickly generate a pinning chart for the Sargent 6300.
Second, we have a control chamber pinning worksheet. This worksheet/matrix, modeled after Sargent’s 6409D training manual, is a “cheat sheet” for control chamber pinning. By using cut depths from the keys being used you can quickly determine the pinning segments for control chambers.
Finally, we have a key bitting specification for Sargent that includes LFIC pin segments and information.