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Master key systems park orchards1/23/2024 ![]() ![]() In addition to the two intended keys, dozens of other cut combinations may work that lock, resulting in an uncontrolled loss of security. By keying a cylinder to fit two random keys, you can create a cylinder with dozens of shear lines. Each additional shear line added further reduces the security level. When the number of shear lines increases, security decreases. Master pins are added to this stack to create additional shear lines. ![]() Each pin stack consists of a spring, top pin or driver and bottom pin. In standard mechanical master keying a primary fundamental is that master keying is a controlled loss of security. For the purposes of this article the term ‘master key’ refers to the top or highest level in the system. In addition to electronics, various high security lock manufacturers offer second and third level locking components that further reduce the loss of security, but in many instances it is a matter of expense that determines the continued use of simple pin tumbler locks in a system. In the commercial and residential world there are multiple advantages to electronic security, but common pin tumbler locks and master keying are still widely used. Even the keyed ignition switch is disappearing. Fewer and fewer cars each year have keyed cylinders in the trunk, doors or glove box. Specifically in the automotive industry we have seen continuing progress in the reduction and elimination of mechanical keyed cylinders. ![]()
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