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Jack Hammer[_7_]

On 05/09/2016 09:27 PM, wrote:
I'm going to take a guess,

The "M" means METRIC

The "5" means 5 milimeter (mm)

The ".8" I dont understand at all. It's surely not .8 threads per inch,
or that would mean less than one thread per inch.

I'm sure the "thd" means THREAD

I googled this and 5mm is 0.197 inch, which needs a 4.20mm drill size.
(NOT what I was looking for)!

Damn, I hate metrics . . . . . . . .

FWIW, 4.2mm is a lot easier to find in a metric drill index than having to hunt thru fractional drills, number drills and letter drills.

I think the real problem is that US manufacturing doesn't know whether to **** or get off the toilet.