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That green book sitting sideways on your shelf is one of the best refrence sources ever. Turn to the section called STEELS and read through it. I bought my copy in 1978 and still refer to it often. There is so much information there for the machinist: speeds, feeds, materials, cutter angles, thread information, bolt sizes, fit specfications etc., etc, etc. If there was only one book I could buy for machinest work, that would be the book. I always keep a copy by my toilet. That is where I have my best quality study time.