Breaking open of Yale ML 14 lock by way of sawing up the catch

Instrument: SKIL 750 watt cutting machine

Breaking time: 1 min.

Video (3 Mb)

Breaking open of Yale ML 14 lock by way of forcing out the door

Instrument: pinch bar 1,5 meter long

Breaking time: 1 min

Video (2,9 Mb)

Breaking open of Yale ML 14 lock by way of boring the catch stem support

Instrument: Bosch GSB16RE 2600 drill, bore d8B1 (P6M5)

Breaking time: 3 min

Video (5,4 Mb)

Breaking open of the lock using key code read-out

The gap between the code groove of pit key and the stem support is equal to 1.2 mm

Step of secret milling is equal to 1 mm (difference between the neighboring secrets)

Totally 6 milling steps in height from the key shank axis: 6, 7, 8, 9, 10, 11 mm

The milled secrets on the key groove are made using the diagonal symmetry method.

Demonstration:

Key No. 1 - original Yale ML 14 lock key
Key No. 2 - "minimum" Yale ML 14 lock key (the last of the 64 keys in the secrets table, all height of secrets milling is less by 1 mm compared to the original key)
Key No.3 - key from the table chosen at random
Key No. 4 - key from the table chosen at random

Video (4,3 Mb)

Conclusions:
1. All keys from the table provided having different secrets due to 1.2 mm gap can easily open the only lock via a choice of key.
2. One key being actually a skeleton key is able to open 64 different locks with minimum choice combinations.
3. Out of the total number of 729 secret combinations, 12 keys are recognized as skeleton keys to be able to open all Yale ML 14 locks produced by KLASS company.

Taking the above analysis into account, any criminal can make a key from a similar table and open your lock.

With a gap equal to 0.58mm as in KERBEROS brand lock, only 1 original key No. 1 would match to the lock having a code:

The milling height from the key stem axis 10 7 11 8 11 8 8 11 8 11 7 10 and the total number of secret combinations would be increased by 64 times and would amount to 46 656 which corresponds to 2nd class lock. For the 3rd class lock, 50 000 combinations are necessary, while for the 4th class - 100 000 combinations (GOST 5089-2003).

The gap between the code groove of pit key and the stem support is equal to
1.2 mm

Original key from Yale ML14 lock

The milled secrets on the key grooves are made using diagonal symmetry method

Diagonal symmetry of the key

Symmetry point
See "Calculation of the number of code
combinations of pit-key locks

Breaking open of Yale ML 14 lock - destruction of cut-off washer

Instrument: hammer and chisel

Breaking open time: 5 seconds

Making false grooves in Yale ML 14 lock