North Carolina Locksmith Practice Exam

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What is the term for a cylinder typically used with surface applied locks and attached with a back plate?

Rim Cylinder
Shear Line
Shell
Ward

The correct answer is: Rim Cylinder

The term for a cylinder that is typically used with surface-applied locks and is attached with a back plate is a "rim cylinder." Rim cylinders are designed to be mounted on the surface of a door rather than being inserted into the door itself, making them suitable for applications where retrofitting or enhancing existing door hardware is necessary. This type of cylinder is commonly found in systems like deadbolts and is secured with a plate on the outside, allowing for functionality and security. In contrast, shear line refers to the line that separates the housing of the lock from the bolt, which is relevant to how locks operate and the process of locking and unlocking. The term shell generally refers to the outer casing or body of a lock but does not specifically indicate it is a cylinder used in surface applications. Ward relates to a type of mechanical lock mechanism involving specific shapes or slots that control a key’s movement, which does not pertain to the type of cylinder described in the question.