Re: New Issue; need advice on how to address

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Posted by TheOldHokie on March 19, 2019 at 19:06:26 [URL] [DELETE] :

In Reply to: Re: New Issue; need advice on how to address posted by Kimberly on March 19, 2019 at 18:27:42:

Helical thread repair inserts are ordered by the thread size. They are basically a double sided coiled thread of the size and pitch being repaired - e.g. a spring with coils in a double sided thread form. A spacial tap is used to re-thread the damaged hole just large enough to screw the OD of the helically coiled thread in and the other side magically forms the repaired threads. This requires almost no removal of material from the damaged female part making it ideal for use in close quarters.

The thin wall, thick wall, and extra thick wall inserts are solid but hollow steel with a standard female thread on the inside and larger standard thread on the outside. Nothing more than a hollow plug with threaded ID and OD. They are also available with a number of different locking mechanisms for keeping them in place. The down side for them is they require drilling a much larger hole for installation. For your application these are the least expensive and easiest to use and a thin wall insert with adhesive for insert retention should work fine:

3/8-16 x 1/2-13 steel thread locking insert

You will have to drill and tap the damaged holes for the outer thread - requires a 29/64 tap drill and 1/2-13 tap. Then simply screw the insert into the hole flush with the top (big screw driver will work) and allow the adhesive to cure before installing the cover bolts.

McMaster is quick and will ship your order UPS the same day you order. I am close to the NJ warehouse and I get my orders around noon the following day.


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