How do I open a Simplex lock?
Simplex locks, now manufactured by Kaba Ilco, are simple push-button combination locks.
Simplex locks are used to protect equipment rooms, labs, and FedEx-type boxes. Simplex locks are used whenever having a large number of keys would create logistical problems.
Simplex Lock Combinations
The Simplex lock would be a normal 5-button combination lock, except for one weakness. Each button on a Simplex lock may only be used once in a combination. A combination of 1-4-3-2 is acceptable. A combination of 1-4-3-1 will not work.
This limits the Simplex lock to only 1,084 possible combinations.
Simplex locks do support half-presses, where you only push the button half-way in. This doubles the number of possible combinations to 2,162. These half-presses are difficult to remember and difficult to use. Because of this, they are seldom utilized.
Opening a Simplex Lock
How do you open a Simplex lock? You try all 1,082 possible combinations. It may seem difficult at first, but with some practice you should be able to open most Simplex locks in under ten minutes.
One convenient method of doing this is to use this chart of all possible Simplex lock combinations.
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