Which component is typically of the same shape and size as the flush fastener being installed?

• A. Press dimplers
• B. Hand dimplers
• C. Squeeze riveters
• D. Machine countersinkers

Answer: (B)

The component that is typically of the same shape and size as the flush fastener being installed is the hand dimpler. Hand dimplers are designed specifically for creating dimples in the aircraft structure that match the contours of the fasteners being used, ensuring a proper fit and reduced aerodynamic drag. By using a hand dimpler that corresponds with the dimensions of the flush fastener, the mechanic achieves a smooth surface that allows the fastener to sit flush with the surrounding material.

While other tools mentioned can be used in fastening operations, they serve different purposes. Press dimplers, for example, apply pressure to create dimples but do not necessarily ensure they match a specific fastener's shape. Squeeze riveters are used for setting rivets rather than shaping the surface to accommodate fasteners. Machine countersinkers cut counterbore holes to allow fasteners to sit flush but are not specifically tailored to match fastener dimensions in the same way hand dimplers are. Thus, hand dimplers are the most relevant choice when considering a component that matches the shape and size of flush fasteners directly.