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Old 11-24-2012, 10:05 PM   #23
Chat Lunatique
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Joined: May 2011
Location: Niagara, Canada
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The standard thread engagement is normally 1.5X the bolt diameter into tapped steel. A steel bolt into aluminum would be 2-2.5X the bolt diameter. So a 6mm bolt should have 12-15mm of engagement in this application. Even though the heli coil is steel, the parent metal is aluminum.
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