GGM
AB
AA AB BA BB
AA1 AA2 AA3 AB1 AB2 AB3 BA1 BA2 BA3 BB1 BB2 SKD1
A
AA AB
AA1 AA2 AA3 A1 AB1 AB2 AB3 SKD1 SKD2
AA
1AA 2AA 3AA 4AA 5AA SKD1
SKD1 SKD2 SKD3 SKD4 SKD5 SKD6
Section 4 - 6
Key Control & Record Keeping
The following key symbols are the lock industry standard, used by manufacturers, BHMA, DHI and ALOA.
T
hey should be used when specifying any master keyed system. The symbols are constructed as follows:
Abbreviation Key type Symbolized by Symbols or "keysets"
GGMK great grand master key GGM GGM
GMK grand master key single letter A, B, C, T
MK master key pair of letters AA, AB, CC, BA, TR
CK change key letters and numbers AA1, AB29, 17AA, SKD1
One level of keying—the most secure keying
Locks are never master keyed, but keyed alike (KA) or keyed different (KD). If you have two cylinders keyed
to SKD1, it is a keyed alike group.
Two levels of keying—simple master key system
Consists of a Master and change keys. Master key is named with an identical pair of letters, AA, BB,
CC, etc. The change key numbers go in front of the letter pair.
Three levels of keying—grand master key system
Consists of a Grand Master and multiple Master keys under the Grand. Change key numbers go after the
letter pair. The first letter of the master key symbols is the grand.
Four levels of keying—great grand master key system.
Consists of a Great Grand Master with multiple Grand Master “systems” under it. Change key numbers go
after the letter pair.
The Standard Key Coding System
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