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Assembly Considerations
Ultrasonic inserts provide a solid, reversible bond without the high stresses found in press fits and expansion inserts. The boss OD should be 2 to 2.5 times the insert diameter for optimum boss performance. The receiving hole can either be straight or have an 8° taper, depending upon the type of insert used. As a general rule, the receiving-hole diameter can be 0.015 to 0.020 inches smaller than the insert OD. Consult the insert manufacturers for their recommendations.. Also, the receiving hole should be deeper than the insert length to prevent the insert from bottoming out.

When installed, the insert should either be flush or up to 0.010" raised above the surface of the boss. If the insert is below the top surface, the embedded insert could pull out of the parent material as the screw is tightened, a condition referred to as "jack out".
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