Locksmith Lock Mechanisms 3

Question 1

In a lever tumbler lock, what must happen for the bolt to retract?

Accepted Answer

All levers must be lifted to the exact correct height to align their gates with the bolt stump

Answer

Each lever tumbler must be lifted by the key to precisely align its gate (slot) with the bolt stump, allowing the bolt to slide and retract.

Question 2

Which lock mechanism is most commonly found in high-security padlocks used for commercial applications in the US?

Accepted Answer

Pin tumbler mechanism with hardened steel inserts

Answer

High-security commercial padlocks typically use pin tumbler mechanisms combined with hardened steel inserts and anti-drill plates to resist physical attacks.

Question 3

What is a 'spool pin' designed to do in a high-security lock?

Accepted Answer

Replace the standard cylindrical driver pin to resist picking by creating a false set

Answer

Spool pins have a narrow center section; during picking, they catch at the shear line and cause the plug to partially rotate to a false set, signaling the picker that further work is needed.

Question 4

A rim cylinder lock is typically mounted:

Accepted Answer

On the surface of the door with a connecting bar to a rim lock case on the interior

Answer

Rim cylinders mount through the door face from the outside and connect via a tailpiece or connecting bar to a rim lock case attached to the interior door surface.

Question 5

What does the term 'key bitting' refer to?

Accepted Answer

The specific cuts made on a key blade that determine which locks it will operate

Answer

Key bitting refers to the pattern and depth of cuts along the key blade that correspond to the height of each pin stack in the lock.

Locksmith Practice Test

Locksmith Practice Test

Locksmith Lock Mechanisms 3