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Old 12-24-2010, 10:48 PM   #1
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countersink concrete

I need to countersink a bolt. It only needs to be countersunk 1/8in to 1/4. What type of tool or bit can I use to countersink concrete? The washer is about 1in in diameter.

Thanks in advance


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Old 12-24-2010, 11:35 PM   #2
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countersink concrete

Cobalt steel and tungsten carbide bits are designed to drill into most construction materials, including concrete.


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Old 12-25-2010, 07:07 PM   #3
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countersink concrete

Does this need to be just a functional counersink or ascetically pleasing?
If just functional, drill a series of smaller hole around the bolt shaft and clean it up with a chisel.
If your drilling a lot of these, get a 1"+ masonary bit and use that.
Or use a grinder.
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Old 12-27-2010, 10:55 AM   #4
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countersink concrete

A high speed electric or air powered die grinder with a carbide bit, along with a steady hand, can result in a fairly clean job.
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