Thread damage during maintenance procedures is typically caused by which factor?

• A. Using Anti-Seize Compound On Threads
• B. Not Cleaning Threads Before Assembly
• C. Improper Torque Settings and/or Lubrication
• D. Over-Tightening Beyond Recommended

Answer: (C)

Thread strength and integrity come from how the fastener threads share load, which is controlled by the right friction conditions and a correct torque value. When torque is set improperly or lubrication is not appropriate, the friction between threads is off, leading to excessive peak stresses, galling, or stripping as you tighten. Proper lubrication helps the load transfer smoothly and prevents seizing, while the correct torque ensures those loads stay within the thread’s capability. If either torque is too high or too low, or the lubricant is unsuitable, threads can be damaged during maintenance. Not cleaning threads, or over-tightening beyond what’s recommended, can contribute to problems, but the most direct and common cause of thread damage is improper torque settings and/or lubrication because it directly governs how the threads handle the load.