mortise lock dimensions

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Lockcase dimensions (depth x height x width) are: L/LV9000 -  4 7/16" x 6 1/16" x 1" L400 -  4 7/16" x 3 5/8" x 1"
UL Listed for 3-hour fire door (except L9076 and L9077)
To convert the Von Duprin 9975NL(Night Latch or Storeroom) to 9975L (Classroom) exit function follow these steps (Note: the mortise lock is shipped as Night Latch from the factory): Turn the NL ...
To convert the Von Duprin 9975L to 9975NL exit function follow these steps (Note: the mortise lock is shipped as Night Latch from the factory): Turn the NL screw on 7500 mortise lock counter clo...
The following steps are required to convert the Von Duprin 98/9975L from classroom to night latch function: Order new 996L-NL-M trim and reset NL drive screw in mortise lockbody as set from...
Typically for a 1-3/4" door you would use a 1-1/4" cylinder.  Use the Table in the Pricebook for a reference: