Assa Door Lock User Manual

Rev. A.1, 8/01 

Page- 3 

lines and knowledge of the gap between the springlatch and deadlatch pin are used to 
determine the vertical position of the springlatch plunger.  When this gap is greater than ¼”, 
best reliability is obtained when the springlatch plunger position is centered on the springlatch.  
When the gap is smaller than ¼”, however, simply centering the springlatch plunger risks 
positioning the deadlatch pin too close to the springlatch plunger so the procedure is to position 
the edge of the springlatch plunger midway between the springlatch and deadlatch pin.  Figure 2 
illustrates these points. 

 

 

Now that you have marked the unit with the correct position for the springlatch plunger, the 
actual adjustment must be performed.  Figure 3 shows the procedure. 

GAP BETWEEN
DOOR AND FRAME

CURVED LIP OF
MORTISE UNLATCH

SPRINGLATCH

DRAW LINES ON MORTISE
UNLATCH DENOTING TOP
AND BOTTOM OF SPRINGLATCH

DEADLATCH PIN
(MAY BE ABOVE)

MEASURE GAP
BETWEEN
SPRINGLATCH AND
DEADLATCH PIN

EXAMPLE OF SPRINGLATCH
PLUNGER CENTERED WITH
RESPECT TO SPRINGLATCH
POSITION (SHOWN BY
DRAWN LINES).  THE PLUNGER
SHOULD BE CENTERED WHEN
THE GAP BETWEEN THE
SPRINGLATCH AND DEADLATCH
PIN IS GREATER THAN 1/4"

WHEN THE GAP BETWEEN THE SPRINGLATCH AND DEADLATCH PIN
IS LESS THAN 1/4", SET THE BOTTOM EDGE OF THE SPRINGLATCH
PLUNGER MIDWAY BETWEEN THE SPRINGLATCH AND DEADLATCH
PIN.  (NOTE THAT THE DEADLATCH PIN MAY BE BELOW THE 
SPRINGLATCH AS IN THIS EXAMPLE, OR ABOVE IT) 

SPRINGLATCH
PLUNGER

SPRINGLATCH BOTTOM EDGE (EXAMPLE)

DEADLATCH PIN TOP EDGE (EXAMPLE)

MIDWAY POSITION