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Why do the DMF bolts need to be replaced?

Due to continuous, strong alternating loads, specially designed bolts are used to secure flywheels. These are usually stretch bolts or bolts with microencapsulation. Stretch bolts have an antifatigue shaft that only covers around 90% of the thread core diameter. When tightened to the torque specified by the vehicle manufacturer (in some cases plus a fixed angular value) the stretch bolt becomes an elastic bolt.

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