Is my die a cutter or rethreader?

birdus · Feb 21, 2017

How do I tell the difference between a cutting die and a rethreading die? My guess is that the cutter has a taper at the initial teeth to help it get started, but I don't know.

Thanks,
Jay

Conrad Hoffman · Feb 21, 2017

I don't think it's an actual law, but aren't rethreading dies usually hex as opposed to round?

DDoug · Feb 21, 2017

Conrad Hoffman said:
I don't think it's an actual law, but aren't rethreading dies usually hex as opposed to round?

....and made by Vermont American.....

birdus · Feb 21, 2017

Conrad Hoffman said:
I don't think it's an actual law, but aren't rethreading dies usually hex as opposed to round?

Someone else told me that, too, but after a quick search, I found that at least some people claim it's not set in stone (i.e., that there are some cutting/threading dies that are hex). In any event, it would be nice to know what the technical difference is, especially if the shape difference isn't an absolute.

JST · Feb 21, 2017

The lowest one of these is a rethreader. The other two are cutting dies. Look closely at the edges, a cutting die typically has a "hook" to it, which can be seen in the photo. The rethreading die is always blunt so as to re-form distorted threads, and not cut them, also visible in the photo.

Outside shape has ABSOLUTELY NOTHING TO DO WITH which type it is

dgfoster · Feb 22, 2017

There MIGHT be round rethreading dies made, but I could not find any. Both MSC and McM list them specifically as "Hex" rethreading dies. So do several US manufacturers but none that I could find list round ones. Seems kind of odd but true---I guess the assumption is all you need ( an may have readily available) is a wrench to turn the thread repair die.

Denis

andrewmawson · Feb 22, 2017

Imagine that you need to clean up the threads on a stud, such as a cylinder head stud. Other studs will prevent a normal die holder turning, hence having a hex outside for a spanner.

L Vanice · Feb 22, 2017

All of my rethreading dies are made with the same size hex as the mating nut for that thread size. For instance, a 3/8-16 or 3/8-24 rethreading die will fit a 9/16 wrench.
The hex-shape cutting dies will all have the same size hex (within their capacity) and fit a die stock made by the tap and die maker.

Larry

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Is my die a cutter or rethreader?

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