NOCTI Maintenance Practice Test

The relationship between torque, clamp load, and friction when seating a fastener is what this question tests. When you tighten, torque is the input you apply. The clamping force that actually holds the parts together—rapidly called clamp load—is the result you get from that torque passing through the threads and under the bolt head. But friction at the threads and under the bearing surface consumes part of that input energy and resists turning, so the same torque can produce different clamp loads depending on lubrication, surface finish, thread condition, and other factors. Because of that, you aim to apply torque that yields the specified clamp load, rather than assuming torque directly equals clamp load. In short, torque is the input, clamp load is the resulting clamping force, and friction is the bridge between them that makes the relationship variable.