mortise lock backset

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SCHLAGE locks are available with the following backsets: Lock Series Lock Type                 ...
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.
Latch
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
 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. 
The standard backset for the Falcon B Series is 2-3/4".  A 2-3/8" backset is also available if specified.
Hinge Spacing: All 4 1/2" and 5" butt hinge spacing 1. Opening heights 3'0" through 4'11 15/16" (one pair butt hinges) from under head CL 9 3/4" (top of door 9 5/8") from bottom of frame ...
Hinge Backset: On the frame = 5/16" On the door = 1/4"
Lock Spacing: All standard bored locks ANSI 115.2 (161, 61L type), for mortise lock ANSI 115.1 (86 type) all locations must be altered 3/8" lower, and standard strike (ASA type). 1. Opening ...
The Schlage ND electrified locks can be ordered with a 3-3/4" backset, but the latch cannot be ordered separately because of UL regulations.