Associated Locksmiths of America (ALOA) Practice Test 2025 – Your Comprehensive All-in-One Guide to Exam Excellence!

The type of cutter specifically used for cylinder keys on a duplicating machine is the filing cutter. This cutter is designed to replicate the precise cuts required for cylinder keys, which often have intricate patterns and grooves. The filing cutter's ability to make fine adjustments is particularly valuable in achieving the accurate replication that is essential in locksmithing.

In the context of duplicating cylinder keys, the filing cutter works effectively with standard duplicating machines to ensure that each key matches the original in terms of both shape and function. It is optimized for the nuances of key design, allowing for smooth and precise cutting which is crucial for the performance of the key in its lock.

Other cutter types may serve different purposes or be used in various machining processes but are not specifically tailored for cylinder key duplication. Therefore, while other options might have their uses in different contexts within the machining or cutting processes, the filing cutter is the correct choice for the task described.