An Allen wrench is designed to remove or install which type of fastener?

An Allen wrench is designed to remove or install which type of fastener?

• A. Hex head screws.
• B. Square head bolts.
• C. Phillips head screws.
• D. Slotted screws.

Answer: (A)

An Allen wrench fits into a hexagonal recess in the fastener head, so it’s designed for fasteners with an internal hex drive. These are typically called hex socket screws (often referred to in practice as hex head screws). The wrench’s six-sided profile lets you apply torque efficiently without slipping or cam-out. The other types use different drive shapes: square head bolts require an external square drive, Phillips head screws use a cross-shaped recess, and slotted screws have a single straight slot.

An Allen wrench fits into a hexagonal recess in the fastener head, so it’s designed for fasteners with an internal hex drive. These are typically called hex socket screws (often referred to in practice as hex head screws). The wrench’s six-sided profile lets you apply torque efficiently without slipping or cam-out.

The other types use different drive shapes: square head bolts require an external square drive, Phillips head screws use a cross-shaped recess, and slotted screws have a single straight slot.