Accuracy of the finished thread when the insert is installed
is dependent upon the accuracy of the tapped hole. If the finished
tapped hole gages satisfactorily, the installed insert will be within
the thread tolerance. It is not necessary to gage the installed
insert. After the insert is installed, the GO thread plug gage may
not enter freely; however, the insert will always seat itself when
the bolt or screw is installed and tightened.
What more needs to be said?
Here is a video on a brief history of the Helicoil Screw Thread Insert (STI):
This data is provided for general information only. The intention is to provide accurate information; regardless; errors may exist in the supplied information. If accuracy is critical, base your final decisions on the data provided in the root document: A-A-59158:1998; which is a copyrighted document. To purchase a copy visit an Authorized Reseller.
Original Posting: 9/25/2009
Last Revision: 2/18/2015
Error corrections in, or comments about, the above data can be sent to: firstname.lastname@example.org.