I needed to tap several holes 10x32. A neighbor said that the easy way was to use a spiral (gun?) tap. He brought one of his to my workshop & proceeded to show me their merit.
Anyway, got me thinking. I now have a good selection of taps: some high carbon (labelled tungsten) and some high speed steel.
I looked online at one of the suppliers catalogs and found a wide selection. What gave me pause tho was the "limit" designation: most commonly, H1 or H2 and infrequently, H3. I have a vague idea that this somehow involves the tolerance of the finished thread.
For all-round, general tapping (mild steel, brass, aluminum), which one should I order? And, to satisfy my curiosity, on what occasion(s) would I want to use the other limits?
Thanks
Anyway, got me thinking. I now have a good selection of taps: some high carbon (labelled tungsten) and some high speed steel.
I looked online at one of the suppliers catalogs and found a wide selection. What gave me pause tho was the "limit" designation: most commonly, H1 or H2 and infrequently, H3. I have a vague idea that this somehow involves the tolerance of the finished thread.
For all-round, general tapping (mild steel, brass, aluminum), which one should I order? And, to satisfy my curiosity, on what occasion(s) would I want to use the other limits?
Thanks