Stripped M6 Hole in EVE Cell - HELP!

[TheGriz]

Okay it happened. One of the M6 holes stripped out on my four EVE 280Ah cells. Please help.

I was going to simply retap for an M8 hole. But my taps lowest/beginning cutting edges will not cut thread deep enough until I get down 3/8" or so, which will puncture into the "chemical" inside the cell, rendering cell useless.

What is the brain trust's preferred method to fix this problem?

Anticipating helpful responses,
Mike

 

[Bob B]

If you do a search for "fixing stripped threads" you will find a LOT of discussion about different ways to fix them.

 

[Bvillebob]

A bottoming tap is what you need. They're designed to tap to the bottom of a hole.

 

[vaderj]

Threaded inserts also exist, though I would imagine you would want to have the insert made of the same material as the battery terminal

 

[Bvillebob]

You can certainly drill it oversize and put in an insert, but to thread the insert in you'll need a bottoming tap for that thread size. Might as well stick with the M8 that's started. They're not expensive, a standard set of taps for a size includes one.

 

[TAS CPA]

@cinergi
His video saved a cell for me! Stripped Terminal Repair
Had to watch it several times to make sure I had the correct sized bits, etc., but it was really easy since I already had a good drill press and grinders to flatten the end of the bits.