Locksmith Advanced Topics 2

Question 1

What is the primary function of a 'master wafer' in a master key system?

Accepted Answer

It allows multiple keys to operate the same lock

Answer

Master wafers create an additional shear line that allows both the change key and the master key to align the tumblers at the correct height.

Question 2

Which type of high-security lock cylinder uses rotating disc tumblers instead of traditional pin stacks?

Accepted Answer

Disc detainer lock

Answer

Disc detainer locks use rotating discs that must all align to a specific angle for the lock to open, offering high resistance to picking.

Question 3

When rekeying a Schlage B-series deadbolt, what tool is used to depress the retaining clip and remove the plug?

Accepted Answer

Follow tool (plug follower)

Answer

A plug follower is inserted behind the plug as it is pushed out to keep the driver pins and springs contained in the shell.

Question 4

In a Grand Master Key (GMK) system, which level of key has the broadest access?

Accepted Answer

Grand Master Key (GMK)

Answer

The Grand Master Key sits at the top of the hierarchy and operates all locks within the entire system.

Question 5

What is 'key bitting specification' (KBS) used for in locksmithing?

Accepted Answer

Defining the depth and spacing of cuts on a key

Answer

The KBS defines the cut depths and spacing increments allowable for a particular keyway, ensuring keys are cut within manufacturer tolerances.

Locksmith Practice Test