Section 3 - 21
Key Cutting & Pinning
A4 System Small Format Interchangeable Core Pinning Chart
#7 top pin makes stack total 14
#4 buildup pin makes stack
height 7 for control.
#1 master pin makes #3 cut
of change key work.
#2 bottom pin for #2 cut of TMK
change key cut is 3
Control 153042
TMK 204153
315204
420315
531420
042531
153042
SOP abcde f
7
4
1
2
A small format interchangeable core pinning chart is an expanded key
b
itting array (KBA) that speeds pinning. At the left is a key bitting array.
The control combination is merely a change key that has been set
aside.
The inset at the left shows the pin stack for
the first change key possibility in the first
chamber.
The “3” from the KBA is in the large oval.
To the right of the oval are the pins needed
to make the #3 cut work with the #2 cut of
the top master key and the #1 cut of the
control key. Pin stacks are read from the
bottom up.
The complete pinning chart contains every
possible pin stack for every possible
change key and master key in the system.
To pin a core to a given key, find the bitting
of the key in each position in the large oval
and install the pins indicated in the squares
next to the oval.
The bottom row beneath the heading
“complete pin stacks for constants”, gives
complete pin stacks, including top pins, for
the rotating constant method, or for pinning
to master keys only.
Factory bitting lists come with pinning
charts.
SKD’s and cross keying
SKD’s and cross keying cannot
be pinned
from this chart. SKD’s are never master
keyed. Cross keying must be calculated
separately for each specification.
3
735846
t
op
pins
565555
151111
103042
575155
242422
002131
285255
333333
201120
395353
224242
200113
4 10 4454
111151
204103
315204
420315
531420
042531
153042
204153
735846
5 11 5555
204153
complete pin stacks for constants
To Next Page
Loading...
