Oklahoma Locksmith Practice Exam

What is the shape of a bottom pin?

1. Pointed on one end, flat on the other end

2. Completely round

3. Square-shaped

4. Curved at both ends

The correct answer is: Pointed on one end, flat on the other end

The shape of a bottom pin in a typical pin tumbler lock is designed to facilitate the proper alignment and function within the lock cylinder. The correct description is that it is pointed on one end and flat on the other end. This design allows the pointed end to easily fit into the corresponding key grooves when a key is inserted, allowing for smooth upward movement as the key lifts the bottom pins away from the shear line. The flat end ensures that the pin sits securely in place when in the locked position, allowing for a precise fit within the lock mechanism. Other shapes, such as completely round or square-shaped, do not provide the necessary functionality for the lock mechanism, as they would either prevent proper engagement with the key or cause issues with the movement of the pins. Similarly, a pin that is curved at both ends would not align properly with other components of the lock, disrupting the locking and unlocking process. This is why the pointed and flat design is essential for the effective operation of pin tumbler locks.