what is less core

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The Schlage ND is shipped with a driver/tailpiece when ordered with a LD, BD, or JD suffix.
 DESCRIPTION PART NUMBER   Conventional Core  23-030  Conventional Core less logo  23-031  Primus Core  20-740  Primus XP Core  20-740-XP  Primus Core less logo  20-741 ...
The Schlage B and BD cylinder suffixes designate less small format interchangeable core (SFIC) cylinder prep for the lock. Any SFIC, 6-pin or 7-pin, can be inserted into the lock and will operate t...
Rim cylinder housing only for FSIC is part number 20-079.
Rim cylinder housing only for SFIC is part number 80-129.
Thermal Bow is a temporary condition which occurs in metal doors mainly due to the temperature differential from one side of the door to the other. This may occur in exterior doors when direct sun ...
2021 Update: An updated version of this knowledge entry can be found by clicking HERE.       Part numbers for Schlage and Falcon cylinders for Von Duprin device...
  FALCON   Mortise Rim KIL Conventio...
    If unclear whether mortise, rim, or key-in-lever is needed, reference links below to determine what cylinder type is needed.   In order to determine cylinder type n...
There are different mortise cylinder length options depending on the cylinder type. Below is a list of available options for conventional, FSIC, and SFIC cylinders, as well as the convent...