What is the advantage of having the internal threads lining up directly under the external threads?

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What is the advantage of having the internal threads lining up directly under the external threads?

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A6. This is done to reduce the wall thickness of the insert to try to limit the loss of strength in the part being repaired. If the new drilled and tapped hole gets too close to an edge when installing any type of insert other than full torque insert, a crack can form from the bolt hole to the edge of the part. Only Full-Torque can add strength to the part.

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