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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 like this for a repair job.

"Tool Making 1905 (Lost Technology Series--Lindsay reprint) these taps were used in "machine tapping" as opposed to "hand tapping."" In the book, Is there any info about the process of using a tapered tap and what it was used for? I did find some info about repairing cracks in cast iron using...

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 small end is chipped but looks like it was .250 diameter when new, the large end diameter is .500 I acquired this unique tap quite a few years ago, it was found in...

Keith Appleton, one of the top youtube steam engine experts, shows exactly how to tune the pm#3. Fyi, the #3 is double acting. <>