Solved: Sourcing an M6x1 thread chaser?

[jburk]

Not a review thread, more of a "where can I find one that's not part of a $100 set?" post. 

Looking for a thread chaser to fix a couple of corroded threads in stainless steel inserts. I can find all sorts of cutting taps, but I'm not looking to remove more material, a chaser is what I'm after.  

The only M6 x 1 thread chasers I can find are part of a larger set running over $100, would prefer to just buy the single item I need. 

Can anyone point me in the right direction?  Please, no links to cutting taps. 

 

[jburk]

nm, found one.  $12 shipping, but it is what it is. 

https://www.langtools.com/sku-50-2620-0005-metric-rethreading-tap-m6-x-1-00/

[slabber]

What's the difference - just way less aggressive than a cutting tap?  I've always simply used a tap, but carefully.  I guess the danger is it gets too loose with a tap?

[JohnE]

A bottoming tap might be your best bet. McMaster-Carr has them:

 https://www.mcmaster.com/8305A57/

 

 

[jburk]

16 hours ago, slabber said:

What's the difference - just way less aggressive than a cutting tap?  I've always simply used a tap, but carefully.  I guess the danger is it gets too loose with a tap?

Yup, less aggressive. If you want to repair an existing thread and can get a chaser started (the first thread isn't messed up), the chaser will reform the messed up portions back to (or close to) original shape without removing material. Use a tiny dab of grease before starting, and the grease will trap any debris displaced in the vertical grooves of the chaser instead of them dropping down into the blind hole.

A cutting tap is a last resort if you can't get the chaser started. No matter how careful you are, every time you use a cutting tap on an existing thread you remove some material and end up with less overlap between the female and male threads (insert threads and bolt threads), resulting in a greater chance that the bolt will strip the insert.