External wrenching bolts are used in high tension stress areas and require which tool for installation/removal?

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

Answer: (A)

Bolt head patterns determine the tool you use. External wrenching bolts have a 12-point head designed to be driven from the outside with a matching 12-point socket. That pattern provides secure engagement under high torque, reducing the chance of slipping or rounding the head when you’re applying a lot of tension. Using the correct 12-point socket ensures the tool fits fully and transfers the torque effectively, which is essential in high-tension stress areas. The other tools won’t fit the 12-point head properly—hex wrenches fit internal patterns, Torx is a different star pattern, and a flathead is a single slot—so they can’t reliably install or remove these bolts.