Torque specification should be followed as stated, even when bolts are lubricated.

Torque specification should be followed as stated, even when bolts are lubricated.

• A. False
• B. Torque should be increased when lubricated
• C. Torque should be disregarded when bolts are lubricated
• D. Torque specification should be followed as stated, even when bolts are lubricated

Answer: (D)

Torque values are chosen to produce the correct clamp load for the given lubrication condition. When threads are lubricated, friction is reduced, so the same torque would create more clamping force than on dry threads if you didn’t adjust. The manufacturer’s torque specification already accounts for this lubrication state, so you should apply the exact value as stated rather than increasing it or ignoring the torque. Changing the value can lead to over-tightening and possible damage, or under-tightening and a poor joint. In short, follow the torque specification exactly as written, even when bolts are lubricated.

Torque values are chosen to produce the correct clamp load for the given lubrication condition. When threads are lubricated, friction is reduced, so the same torque would create more clamping force than on dry threads if you didn’t adjust. The manufacturer’s torque specification already accounts for this lubrication state, so you should apply the exact value as stated rather than increasing it or ignoring the torque. Changing the value can lead to over-tightening and possible damage, or under-tightening and a poor joint. In short, follow the torque specification exactly as written, even when bolts are lubricated.