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Bolts - Lubrication Effects on Torque and Tension

Lubrication effects on torque and bolt tension

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If bolt threads are lubricated the torque required to achieve the bolt tension is reduced.

LubricantTorque (ft lb) Torque Decrease (%)
5/16"
  (18 Threads)
1/2"
(13 Threads)
No lube 29 121 0
Graphite 13 62 49-55
White Grease 16 79 35-45
SAE 30 oil 16 79 35-45
SAE 40 oil 17 83 31-41
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