On Aug 29, 8:16*am, "Jack Lai" wrote:
I am looking for small metric counterbores 3mm and smaller, MSC and McMaster
only have 3mm and bigger. I can get custom made counterbore made to spec.
but they cost too much, and min. qty.of *6 each. per size.

Thanks in advance for your help, Jack

Are you aware you can grind any drill bit, including Metric, flat on
the tip and use it for counterboring? First, start the hole with a
normal drill bit of the size you need, and then finish it with the
flat bottom drill.

I learned this when I bought a set of letter drills at a machine shop
auction and they were all ground flat on the bottom. Work like a charm
for counter boring.

Paul