Why Correct Torque Matters: Preventing Accidents and Damage in Automotive and Aviation Maintenance

In both automotive and aviation maintenance, ensuring the correct tightening torque is crucial. Adhering to the recommended torque specifications is essential, as it’s the foundation of the work. However, this is often overlooked, leading to potential accidents.

Whether you’re working on an engine or tightening wheel bolts, like those shown in the picture above, it’s critical to follow the manufacturer’s recommended torque settings. Generally, bolts shouldn’t be tightened too loosely, but over-tightening is equally problematic. It can lead to damage to parts or products.

BMW Wheel Lock Bolt (Located at the 2 o’clock position)

Some imported vehicles feature a unique “Lock Wheel Bolt,” installed on one of the wheel bolts. This lock bolt is weaker than the regular bolts and should be tightened to 110 N·m, while the regular bolts require a torque of 140 N·m. Lock bolts are specifically designed to prevent wheel theft, which is common in Europe. They can only be removed with a special adapter unique to each vehicle.

Example of a Bolt Damaged by Over-Tightening

Bolts that are over-tightened, like the one shown in the image, can become deformed. In some cases, the bolt becomes completely stuck or jammed. This leads to product damage and potentially dangerous situations. 

In many cases, tire shops over-tighten bolts during installation. Later, when the brake pads need to be replaced or the wheels need removal, the bolts won’t budge. This often results in frustration and disputes with the service center.

By following correct procedures, using proper tools, and adhering to maintenance manuals, workshops can avoid unnecessary disputes, customer complaints, and wasted time—while protecting customers’ valuable vehicles.

While this example uses car wheels, the same principle applies to engines, transmissions, chassis, and even aircraft maintenance. Accidents caused by incorrect torque should never happen. Maintaining the proper torque is fundamental for any mechanic.