Karbyde

That helped! There's info on the internet about the Reece Company, which specialized in taps and dies for the pipe industry. After...

Is there any easy way to determine what thread pitch is used on current or historical stitching screws? That would either verify or...

I think cast iron stitching is what this tap was used for. My dad had an auto/tractor repair shop in the 60's, I bet he bought a set...

It is not a nut tap. Totally the wrong shape (short shank above the threaded part and the taper goes the full length of it). A nut tap...

"Tool Making 1905 (Lost Technology Series--Lindsay reprint) these taps were used in "machine tapping" as opposed to "hand tapping.""...

It tap for fine adjusting. I have only seen in books. If I need adjustment I used a pipe tap and die a lot cheaper. Dave

If we speculate that it is cycle thread, we have to explain how it would be useful as a tapered item. In the UK, we have another old 26...

Reece Co., Greenfield, Mass.

The only markings on the shank are the mfr. name/location and the pitch marking of 26 tpi. It's taper is similar to a pipe tap. The...