Associated Locksmiths of America (ALOA) Test 2025 – 400 Free Practice Questions to Pass the Exam

The control shearline is the specific shearline that permits the removal of the core assembly from its housing in a lock. This shearline is crucial in lock design, particularly for interchangeable core locks, where the lock's operational control is separated from the locking mechanism itself.

In essence, the control shearline is engaged when a control key is used, allowing the cylinder to be disengaged and removed safely without affecting the overall security of the lock. This mechanism facilitates easy maintenance and rekeying of locks without the need for extensive disassembly or replacement.

Understanding the role of the control shearline is vital for locksmiths, as it directly impacts their ability to service locks efficiently. The other shearline types—like the key shearline, which corresponds to the position of the key when it is inserted into the lock—do not serve the same function of allowing the removal of the core assembly.