How can you ensure a bolt is properly lubricated before installation?

To ensure a bolt is properly lubricated before installation, applying a suitable lubricant to the threads is the best approach. This method directly addresses the primary purpose of lubrication, which is to reduce friction between the threads of the bolt and the nut or the tapped hole it is being installed into. Proper lubrication helps achieve accurate torque settings, minimizes galling and thread wear, and ensures a more consistent clamp load once the bolt is tightened.

While soaking a bolt in oil might provide some degree of lubrication, it can be impractical and may not adequately coat all necessary surfaces, potentially leaving some areas without sufficient lubrication. Similarly, using a spray lubricant could result in an uneven application and may not adequately penetrate the threads. Cleaning the bolt with solvent is important for removing old lubricants or dirt but does not contribute to lubrication itself.

Applying lubricant directly to the threads allows for more control over the amount applied and ensures that all threaded sections are adequately covered, making it the most effective method for preparing a bolt for installation.