How should a lock wire pigtail be formed?

• A. A long, loose loop
• B. A short, neat loop at the end with a secure twist
• C. A random twist with no loop
• D. A U-shaped hook

Answer: (B)

Lock wire pigtails are formed to keep fasteners from vibrating loose while providing a clean, predictable break point for removal. A short, neat loop at the end with a secure twist creates a tight, controlled tie that stays in place, resists vibration, and won’t snag on nearby parts. The loop is kept small so it sits close to the fastener and the twist is firm, giving a reliable break point when the fastener must be removed. A long, loose loop can work itself loose; a random twist with no loop offers no proper hold; and a U-shaped hook can snag or damage components and still fail to provide a proper, secure pigtail.