Recommendation for tap fit hole tolerance in 4140 pre-hard steel

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Recommendation for tap fit hole tolerance in 4140 pre-hard steel John2005 11-29-2007
Posted by John2005 on November 29, 2007, 8:29 pm
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>I will give that a try if I can't find the ammonium version. I have some
>pipe flux with zinc chloride but it is only 8%.
>
> --
> Glenn Ashmore


Don't forget, you can make your own (much stronger) by killing some
hydrochloric acid with a handful of zinc. (I presume you have zinc lying
around if you're galvanising stuff.) Otherwise use scrap galvanised steel.

Cheers
--
Jeff R.




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