In addition to the included angle of the tip, thread type is a key specification for threading inserts. Thread type refers to the helical structure used to convert between rotational and linear movement. Common types include UNC, UNRC, UNF, UNRF, 8UN, Acme, and Whitworth threads.

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Other types of threading inserts include ball nose, radius tip, and chamfer tip mills. Dogbone threading inserts are available, too. These two-edged inserts have a narrow mounting center and, as their name implies, a broader cutting feature on both ends. They are often used for grooving.

Rectangular threading inserts have two long sides and short sides. They are used for grooving operations where the short sides contain the actual cutting edge.

Square threading inserts have square-shaped cutting tips with four equal sides. They are used for precision thread cutting.

The insert size is generally categorized by the inscribed circle (I.C.), or the diameter of the circle that fits entirely within the insert geometry. Inscribed circle is used for most indexable inserts, except for rectangular and some parallelogram inserts, where length and width are used.

Threading inserts are the latest edition to thread forming and thread cutting. These are indexable inserts which can be used for same pitch (tpi) for multiple diameters. They are applicable to all materials and have different grades for them.Although some threading inserts have only one cutting surface, others have multiple cutters so that when one tooth wears out, work can move to a sharp tooth. The threading insert's shape determines the number of sides and cutting angles.

The V. M. Tools Co. database provides information about many different types of threading inserts. Most are described according to shape.