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6-32 STI-28 thread 1

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ewh

ewh

Aerospace
Joined
Mar 28, 2003
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Is anyone familiar with a "STI" thread callout? I have a drawing specifying it, and it also specifies a pilot diameter of .147 (for a 6-32). Could this be a threaded insert prep callout? The hole is in aluminum.
 
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Thanks BillPSU. I thought it must be something like that, but I didn't have any literature handy. I am accustomed to calling out heli-coil holes as "PER NASM33537" and the STI threw me.
 
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