Question 15.5: Determining the Torque to Generate a Bolt Preload Problem Fi...

Machine Design: An Integrated Approach

Determining the Torque to Generate a Bolt Preload

Problem Find the torque required to preload the bolt in Example 15-3.

Given A 5/16-18 UNC-2A, grade 5.2 bolt, 2.5 in long, preloaded to 90% of proof strength with an axial force of 4 011 lb.

Assumptions The threads will be lubricated. Assume a coefficient of friction of 0.15.

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