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I'm no expert, but broke off 1 old brass bolt flush in the cast iron flange of a toilet drain- I then used a metal bit to drill holes for the toilet riser/extender thing to attach to. This all stemmed from a remodel and having mounting bolts too short for the new bowl. The mason bit i tried didn't work as well as the metal bit. I started out small and worked my way up in size. Byron snowslider

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15y ago
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14y ago

Drilling through angle iron is done oin the same way as drilling through other shapes of mild steel.

# Mark the position the hole is required # use a drill punch so that the drill bit will stay on target when starting to drill # use a sharp drill bit and drill # if the hole required is large in diameter, drill a smaller hole first so that you are not trying to remove too much material at once.

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13y ago

There is a hole saw that is designed for this. It will have a specific edge. research hole saws for a manufacturer in your area.

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11y ago

HSS bits are best for drilling cast iron. Use a low speed and lots of cutting oil.

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11y ago

Standard HSS bits are good for cast iron.

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11y ago

You use a regular HSS bit.

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Q: What drill bits to use on cast iron?
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