S: Shape designation (Square indexable geometry).
D: Clearance angle code (features a 15° positive clearance angle).
M: Tolerance class (specifies precision parameters for height and thickness).
T: Clamping/fixing type (countersunk hole with a single-sided chipbreaker design).
12: Size code (Inscribed Circle (IC) measurement of 12.7 mm / 0.5 inches).
04: Thickness designation (standard insert thickness of 4.81 mm).
PDR: Corner/edge configuration (Specifies a right-hand cutting direction with standard indexing facets).
MH: Chipbreaker style (Engineered specifically for Medium Machining operations, providing balanced chip control and reduced cutting forces.