CML Lock Mechanisms & Hardware

Question 1

What is a pin tumbler lock?

Accepted Answer

A lock using pins to prevent unauthorized opening

Answer

A pin tumbler lock is a common type of lock mechanism that uses a set of small pins, or tumblers, of varying lengths to prevent the lock from opening without the correct key. When the correct key is inserted, it aligns these pins precisely at a shear line, allowing the cylinder to rotate and the lock to open. This design provides a robust and widely used form of mechanical security.

Question 2

What is the function of a deadbolt?

Accepted Answer

Provides extra security by extending bolt

Answer

The primary function of a deadbolt is to provide enhanced security by extending a solid metal bolt deep into the door frame, independent of the spring-loaded latch. Unlike a latch bolt, a deadbolt cannot be retracted by simply turning a doorknob or by using a credit card, making it significantly more resistant to forced entry. This robust locking mechanism offers superior protection against break-ins.

Question 3

What type of lock hardware is commonly used on commercial doors?

Accepted Answer

Panic bars

Answer

Panic bars (also known as exit devices or crash bars) are commonly used on commercial doors, especially those requiring emergency egress. These devices allow occupants to open a locked door simply by pushing a bar on the inside, facilitating quick and safe exit during emergencies like fires. They combine security from the outside with unhindered exit from the inside, complying with fire safety codes and ensuring occupant safety.

Question 4

What is a mortise lock?

Accepted Answer

Lock installed inside door edge pocket

Answer

A mortise lock is a type of lock that is installed by cutting a rectangular pocket, or mortise, into the edge of the door. The entire lock body, including the latch, deadbolt, and often the cylinder, fits within this pocket, making it a very secure and aesthetically integrated locking solution. Mortise locks are known for their durability and are frequently used in commercial and high-end residential applications due to their robust construction.

Question 5

What is the purpose of strike plates?

Accepted Answer

Reinforce door frame for latch or bolt

Answer

Strike plates are metal plates installed on the door frame where the latch bolt or deadbolt enters when the door is closed. Their purpose is to reinforce the door frame, providing a durable and secure receptacle for the bolt. This reinforcement prevents wear and tear on the frame and significantly enhances the door's resistance to forced entry, making it harder to kick in or pry open.

(CML) Certified Master Locksmith Practice Test

(CML) Certified Master Locksmith Practice Test

CML Lock Mechanisms & Hardware