adjustable backset latch

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 The Y latches listed below are adjustable to fit either a 2 3/8" or 2 3/4" backset. LATCHES WITH LOCKS  Description  Backset  Specify  Square corner, 1-1/8" x 2-1/4", standard  2...
 The latches for the Y and F lock are not interchangeable as the hole sizes are different. Substituting any latch voids your UL and product warranty. 
This is available, specify 41-005 for an extension link that is used with a 2 3/8" latch to effectively make a 5" backset.
The standard backset for the Falcon B Series is 2-3/4".  A 2-3/8" backset is also available if specified.
A and AL product: Must use the 2 3/8" backset with the 41-005 extension linkD Knob and ND product: Must use the 2 3/4" backset with the 43-005 extension link
Hospital latch available backsets:  2-3/4", 3-3/4", 5" or 7"
The default backset is 2 3/4" and the latch faceplate dimensions are 1 1/8" x 2 1/4". The latch supplied is the 13-047 deadlatch and 13-048 springlatch.