What characteristic is important for fasteners in construction?

The characteristic that is important for fasteners in construction is having a specific torque applied. This is crucial because the performance and safety of structures often depend on how tightly fasteners are secured. Applying the correct torque ensures that the fastener is neither too tight nor too loose, which can lead to structural failures. An adequately torqued fastener maintains the integrity of the joint it secures, allowing for proper load distribution and reducing the likelihood of loosening over time due to vibrations or movements.

In contrast, being overly tight can cause damage to the fastener or the materials being joined, potentially leading to failures. While being made of lightweight material may have its benefits in terms of ease of handling and cost, it is not a primary factor affecting the fastener's performance under load. Lastly, resistance to rust is important for longevity, but focusing solely on rust resistance without considering the torque specifications can compromise the overall effectiveness and safety of the connection. Therefore, applying a specific torque is central to ensuring the reliability and performance of fasteners in construction.