Which statement best describes the effect of lubrication on the torque-tension relationship?

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Multiple Choice

Which statement best describes the effect of lubrication on the torque-tension relationship?

When lubrication is present, friction in the threads and under the bolt head is reduced. In tightening a fastener, part of the applied torque is spent overcoming this friction; with lubrication, that portion is smaller, so more of the torque goes into producing axial clamping force. As a result, for the same torque value, the clamp load increases. This is why lubricated fasteners achieve higher tension at the same torque.

When lubrication is present, friction in the threads and under the bolt head is reduced. In tightening a fastener, part of the applied torque is spent overcoming this friction; with lubrication, that portion is smaller, so more of the torque goes into producing axial clamping force. As a result, for the same torque value, the clamp load increases. This is why lubricated fasteners achieve higher tension at the same torque.

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