Lock Mechanisms & Hardware Flashcards

What is a 'master wafer' (or master disc) in a master-keyed pin tumbler lock?

Answer: An extra pin segment added to a pin stack to create an additional shear line for a master key

A master wafer (also called master pin) is a thin pin segment inserted into a pin stack to create a second shear line, allowing both the change key and the master key to operate the cylinder.

What is the purpose of a 'key control' system in a commercial facility?

Answer: To restrict unauthorized duplication of keys through patented keyways and registered key blanks

Key control systems use proprietary, patented keyways and registered key blanks that cannot be legally duplicated without authorization, controlling who can obtain additional copies.

A locksmith is working with a Schlage B-series deadbolt. What is the standard throw length of this bolt?

Answer: 1 inch

Standard residential and light commercial deadbolts, including the Schlage B-series, have a 1-inch bolt throw, which is the minimum recommended by most security standards.

Which mechanism in a high-security padlock is designed to protect against bolt-cutter attacks?

Answer: A hardened steel shackle with boron or chromium alloy

High-security padlocks use shackles made from hardened boron alloy or chrome-moly steel, which is significantly harder than standard steel and resists cutting with bolt cutters.

What is 'mushroom pinning' and why is it used?

Answer: A technique using mushroom-shaped driver pins to increase resistance to picking by creating false sets

Mushroom (or spool) pins have a shaped profile that creates a 'false set' during picking attempts, causing the plug to partially rotate and then bind again, frustrating standard single-pin picking.

In a lever tumbler lock (common in safe deposit boxes), what is the 'fence'?

Answer: A projection on the bolt that must align with the gates of all levers before the bolt can move

The fence is a projection on the lock bolt that must align with the gate (notch) in every lever simultaneously; when all levers are lifted to the correct height by the key, the fence passes through and the bolt can move.

What is the function of an 'anti-drill plate' or 'hard plate' in a lock?

Answer: To protect critical lock components from drill bits by deflecting or destroying the drill tip

An anti-drill (hard) plate is a layer of case-hardened steel or carbide material placed over critical components that spins or breaks drill bits, protecting the lock's internal mechanism from drill attacks.