Cut Tap VS Roll Form Tap Question

I hope everyone had a wonderful Thanksgiving.... er.... National guilt free
gluttony day.
Question of the day - Does the typical roll form tap have the same round
shank and square drive as a cut tap?
i.e. Will my ER20 Tap collet for 1/4-20 cut tap work with a typical 1/4-20
roll form tap?
I *think* the shanks are identical except for metric shank taps, etc. But
I'm submitting this to the expert-level braintrust for opinions and
I'm thinking of drop shipping 05410-194 for a 3/16" roll form tap
application my customer has from the following source:
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If I ship the boatload of collets they want and they're wrong, I loose my
Christmas bonus or something. :)
Thanks for any wisdom you can share.
Joe Agro, Jr.
(800) 871-5022
Automatic / Pneumatic Drills:
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Spindle Drills:
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Reply to
Joe AutoDrill
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Why guess?
Call the customer and ask him to measure the taps he wants to use.
If the customer does not yet have the taps, call the customers supplier of taps.
Reply to
Roger Shoaf
If you knew the customer, you'd know that asking here has a better chance of getting the correct answer... :)
Reply to
Joe AutoDrill
I think you'll find that most taps of similar sizes will have the same shank diameters. Whether they're inch *or* metric, roll form *or* cut taps.
I just checked a few taps and found that the 1/4-20, 1/4-28 & 1/4-32 cut taps have the same shank diameter as the 1/4-20 roll tap, *and* the M6x1 cut and roll tap. My Greenfield M12x1.75 roll tap has the same shank diameter as the OSG 1/2-13 cut tap. The 5/16-18 cut and roll taps are the same, and the 3/8-16 cut and roll taps have the same shank diameter.
Here's what I wrote in a response to BD in another thread (Tap Collets....) a few weeks ago:
Reply to
Matt Stawicki
That has been my personal experience as well. However, having run across a few metric shank taps and "strange" shank taps over the years, I figured I'd try to learn about the standard.
Looks like you are correct. Folks here as well as a few other places seem to agree that there is a *very* good chance the shanks and square drives are the same or compatible.
Excellent then and excellent now. Thank you again.
Reply to
Joe AutoDrill
Does anybody use sti roll taps? I was told that Emhart(Heli-coil) doesn't advise their use. I guess Balax see's it differently.
Reply to

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