T: Indicates a Triangular shape (60-degree equilateral triangle).
P: Denotes an 11-degree positive clearance angle, which provides high sharpness and reduces cutting resistance.
G: Represents a G-Class tolerance profile, meaning it is precision-ground on all faces for maximum dimensional repeatability.
X: Indicates a special clamping or structural design trait (usually a custom hole structure or lack of a standard chipbreaker) depending on the maker.
08: The nominal Inscribed Circle (IC) size is 8 mm.
02: The thickness of the insert body is exactly 2.38 mm.
04: The corner radius (nose radius) is 0.4 mm. This small radius is critical for generating a mirror-smooth surface finish and keeping tool pressure low.
L: Specifies a Left-hand cutting direction.
Popular Grades and Applications
While many manufacturers make this ISO shape, Mitsubishi Materials is the most renowned manufacturer for this specific design:
NX2525 (Cermet Grade): This is the most common grade sold in India. Cermet handles high heat incredibly well, making it ideal for high-speed finishing on Steels (P-class) and Stainless Steels (M-class) to achieve a shiny surface finish.
HTI10 (Uncoated Carbide Grade): Used primarily for high-precision finishing on non-ferrous materials like Aluminium, Copper, and Brass.