On 11/05/2017 12:36 PM, Chris Albertson wrote:
MSC has "everything" and if you can wait they will have a 20% off free
shipping sale.
And where can I src from here in the US, a decent quality, 10mm 1.5
pitch, solid carbide spiral machine tap?
Solid carbide taps are very seldom used for hard material mostly for
abrasive plastics and such. To use them on steel is asking for a chipped
tap.
A good tap from Widia/GTD, OSG and similar will work on steels up to
about 50Rc. Typical "hard" steel is only 30 or so Rockwell and taps like
butter with the right lube and a good tap. Moly Dee is my favorite lube
for cut thread and forming thread taps, lard works in a pinch for cut
threads.
Hardware store taps? Do not apply! Buy a good tap even if you only
plan to use it once.
Ed.
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