Which tool is used to install or remove internal wrenching bolts?

Which tool is used to install or remove internal wrenching bolts?

• A. Hex wrench
• B. 12 point socket
• C. Flathead screwdriver
• D. Pliers

Answer: (A)

Internal wrenching bolts have a recessed hexagonal socket in the bolt head. A hex wrench (Allen key) fits neatly into that internal recess and turns the bolt by applying torque along the length of the wrench. The other tools don’t fit the recessed socket: a flathead screwdriver works on a slot, not a hex recess; pliers can’t reliably engage and turn without slipping or damaging the bolt; and a 12-point socket is for external drive shapes, not the internal hex drive of these bolts. So the hex wrench is the right tool for installing or removing internal wrenching bolts.

Internal wrenching bolts have a recessed hexagonal socket in the bolt head. A hex wrench (Allen key) fits neatly into that internal recess and turns the bolt by applying torque along the length of the wrench. The other tools don’t fit the recessed socket: a flathead screwdriver works on a slot, not a hex recess; pliers can’t reliably engage and turn without slipping or damaging the bolt; and a 12-point socket is for external drive shapes, not the internal hex drive of these bolts. So the hex wrench is the right tool for installing or removing internal wrenching bolts.