So, I've got a project that is going to require bolting Ipe lumber to a steel frame. I've got 5/16" flathead bolts (stainless), so I need to countersink the head flush. The head diameter is 5/8". I've got about 750 holes to drill, so I do not want a two step process where I drill the pilot then countersink with a different bit (1400 drill operations). It looks like Amana has a couple of options for Carbide tipped countersinks with a drill bit that will get my 5/16" bore and 5/8" countersink, but before I drop $40 on a bit, I wanted ask some questions:


  • Do you know of another countersink bit that would work for my application?
  • What is the likelyhood that one bit will drill 750 holes in Ipe before getting too dull?
  • Any other recommendations?


I've done my homework on the Ipe - it is hard and it is tough on cutting tools. The client likes the wood and the fasteners so I'm locked in on those. I just need to figure out the best tool for the countersinking. So far, Amana is the only manufacturer that I have found with a 5/8" countersink attached to a drill bit.

Let me know your thoughts!

Jon


Picture of my bolts and the two Amana bits I am considering:
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