Best 72KC, Service Manual

BEST ACCESS SYSTEMS

Indianapolis, Indiana

For factory prepared doors only

Caution:  

If you use hollow metal doors, determine whether the 

doors are reinforced enough to support the lock. If door rein-
forcement is not adequate, consult the door manufacturer for 
information on proper reinforcement.

Simplified instructions

1  Install the latch so that the bevel on the latchbolt faces the strike.
2  Adjust the outside rose assembly so that the chassis is centered in 

the door. Install the chassis from the outside of the door.

3  Install the inside liner, through-bolts, rose, lever and strike.

For field door preparation and detailed installation instructions, see the 
following tasks.

1

Position template

1  Fold the template and place it in position on the high edge of the 

door bevel. See Figure 2.

2  Mark the drill points.

Note: 

The suggested height from the floor to centerline of the lock is 

40 5/16". If steel frames are used, the latch centerline must be in line 
with the center of the strike preparation.

2

Bore two holes and install latch

1  Bore a 2 1/8" diameter hole from both sides of the door, to the center 

of the door.

2  Drill a 1" diameter hole from the edge of the door that intersects the 

2 1/8"  hole.

3  Mortise the door edge for the latch face.
4  Install the latch through the 1” diameter hole. For drive-in latches, 

use a rubber mallet. Latch tabs should project into the 2 1/8" 
diameter hole. See figure 3 in task 3.

5  Check the door swing.

3

Install boring jig and drill two 

5/16

” 

diameter holes

1  Install the boring jig onto the door and engage with the latch tabs. 

Make sure the front edge of the jig is parallel with the door edge. See 
Figure 3.

2  Drill two 5/16" diameter holes halfway into the door.
3  Turn the boring jig over and repeat steps one and two from the 

opposite side of the door.

Note: 

Replace the boring jig after ten door preparations.

4

Adjust lock to door thickness

1  Temporarily remove the latch.

 Figure 1 — Overview of installing the lock

 Figure 2 — Placing the template onto the door

Inside rose

Inside liner

Latch

Through-bolts

Outside

Lever

TEMPLATE

High edge of door bevel

 Figure 3 — Installing the boring jig onto the door

 Figure 4 — Adjusting the lock to match the door thickness

Door edge

5/16” diameter

Latch tabs

Boring jig

Door center

Retractor
Pull pin to rotate rose

—

Continued

Installation Instructions 
for 72KC–75KC Cylindrical Locks 

T80622/Rev B   1827069   ER-7991-19    April 2002