--Actually there are two different style bits: one that produces the flange and one that cuts it off. Mostly I prefer to keep the flange on as it means no material removal and therefore less weakening of the part.
Nice ! McMaster-Carr are on the wrong side of the pond for me but I'll have to ask my supplier if they have anything like that. Thanks.
And one more wrinkle no-one has mentioned yet: you can get self- tapping screws that use a roll-form tip rather than a tap cutting tip. I don't know how much $$$, though.
--Glenn Lyford
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