What is necessary for aluminum bolts to achieve proper torque?

To achieve proper torque when using aluminum bolts, lubrication is essential. This is because aluminum has a tendency to seize and gall when under high stress or torque, which can lead to either under-tightening or over-tightening of the bolt. Lubrication reduces friction between the bolt threads and the mating surface, allowing for a more accurate torque setting. This leads to better clamping force and prevents damage to the bolt or the materials being fastened.

Using lubrication also ensures that the force applied to the bolt translates effectively into tension without being hindered by frictional resistance. This practice is crucial in assembly work where the integrity of the joint is paramount, especially in applications where aluminum bolts are subject to cyclic loading.

Other options do not address the critical role of reducing friction: heating can alter the properties of the aluminum, coating with oil might not provide sufficient lubrication for proper torqueing, and using a higher torque setting could lead to unintended consequences such as stripping or breaking the bolt. Therefore, lubrication stands out as the necessary factor for achieving the correct torque with aluminum bolts.