I do not think that I have ever tapped steel before, but I am pleased to report that with oil on the tap, cold rolled isn't much worse than aluminum. Even with the Tapmatic I wasn't terribly concerned about breaking a tap. I really need a bottoming tap, which arrived today.
And the bottoming tap was spiral flute. It did a lovely job tapping a 1/2" hole (which is 10 revolutions).
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