There are so many styles of threading inserts, top Notch, On Edge,
Example: Laydown has IC size (Inscribed Circle) Threads per Inch if
it's a full profile, 60 or 55 Degree, Max and Min TPI, Grade of
Carbide, Chipbreaker or No Chipbreaker.
I suggest getting a Vardex and a Carmex catalog. They use different
types of nomenclature and they are two most popular non-proprietary
styles on the market today.
Try this site for a good reference too.
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