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2. Application Requirements:
a. Suitable for door thickness 30~40 mm.
b. Allowable latch cavity not to exceed 3 mm as shown below.
3. Measure:
Note: SD-991A and SD-991B are mounted the same way.
A. Latch line (see fig. 1):
1). Measure the distance between the face of the door jamb and the face of the door latch.
If the door latch has a deadlatch pin, ignore the deadlatch pin when measuring. This is
the vertical latch distance.
2). Measure the vertical latch distance on the door jamb from the face of the door jamb. At
that point, draw a vertical line. This is the latch line.
B. Center line (see fig. 2):
1). Measure the distance from the floor to the center of the door latch. Ignore the location of
the deadlatch pin when measuring.
2). Measure that distance from the floor along the inside of the door jamb. At that point,
draw a horizontal line. This is the center line.
4. Mount The Template:
Align and tape the template on the door jamb to the latch line and the center line, and tape it
(see fig. 3)
5. Cut:
Cut into the door jamb as shown on the template (see fig. 4). Cut into the door jamb to a depth
of 17 mm. Dispose or recycle the metal which was cut out.
Note: If wood door, use a chisel to knock out a 3 mm. (1/8 inch) deep space as shown on the
template. (See fig. 4)
6. Double-Check The Cut:
Place the unit in the hole, and make sure it fits properly. Make any necessary adjustments.
7. Connect Wires and Insulate:
Connect the two wires to the access control or egress device, such as a digital keypad,
push-button switch, push bar, or other device. Polarity is not important. Insulate the wire
connections carefully.
8. Mounting:
Push all the wires into the door frame. If needed, cut away the dust catcher inside the frame,
or carefully chip away part of the drywall, being careful to not harm the wall. Adjust as needed
to ensure the door closes smoothly every time someone passes through the protected
opening. See fig. 5.
Lockset
Latch
Too Big
Latch
3mm
Lockset
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Fig. 4 –
Cutting the hole
using the template
Note: If wood door,
use a chisel to
knock out a 3mm
(1/8”) deep space as
shown on the
template.
Door jamb
17mm
Door
Door latch
Deadlatch pin
Fig. 1 –
Measuring
the latch
line
Door jamb
Vertical latch
distance
Latch line
Door knob
Fig. 2 –
Measuring
the center
line
Center line
Door latch
Door jamb
Template
Door jamb
Center line
Latch line
Fig. 3 –
Aligning the
template
Dimensions needed
to install strike.
Unit: mm
Fig. 5 – Mounting
Connect with wires and insulate before installing the strike.
S/S or Aluminum door frame
Wooden door frame
