22: Insert Size (L) – Refers to the cutting edge length of 22 mm, corresponding to a large 1/2" Inscribed Circle (I.C.) size designed for high-stability machining.
I: Internal – The profile layout is explicitly designed for cutting internal threads (e.g., inside bores or pipes).
R: Right Hand – Specifies the hand configuration for standard right-hand tool holders and cutting directions.
N60: 60° Partial Profile – Denotes a non-cresting partial thread profile with a 60° included angle. Because it is a partial form, a single insert can dynamically machine a range of different thread sizes across ISO Metric, UN (Unified), and NPT standards without needing tool changes.
Common Carbide Grades
Carmex manufactures this insert configuration in a few specialized coatings:
BMA Grade: A submicron substrate coated with a multilayered TiAlN PVD coating. It functions as a highly versatile "universal grade" optimized for medium-to-high cutting speeds on stainless steel, alloy steel, and general materials.
P25C Grade: Features a tough carbide core combined with a specialized thermal layer (often featuring a TiN finish), making it exceptionally robust against fracture and wear when cutting tougher carbon steels.