Which description best fits the correct approach to torqueing with lock tabs and maintaining alignment?

• A. Torque both bolt and nut to spec and ensure tab aligns with the notch
• B. Torque bolt only and ignore the notch
• C. Do not torque the nut
• D. Use only a lock tab without torque

Answer: (A)

Lock tabs provide both a locking action and a visual check that the fastener has been tightened to the proper value. The correct approach is to torque both the bolt and the nut to the specified values, then bend or position the tab so it aligns with the designated notch. This ensures the necessary clamp load is achieved for a secure connection, and the tab-to-notch alignment confirms the assembly has seated at the correct torque and hasn’t shifted. If you only torque the bolt and disregard the notch, the nut isn’t being clamped to the intended specification and there’s no reliable visual indication of proper seating. If you don’t torque the nut, you won’t achieve the required preload and the joint can loosen. Relying on the tab alone without applying torque provides no real locking force and is vulnerable to movement. The notch alignment after torquing is the practical sign that everything is correctly seated and secured.