
Precision Tooling for Hard Milling and Class-A Mold Finishing. Hard milling P20, H13, D2, and S7 tool steels demands tooling engineered for hardness, accuracy, and surface quality. Spec Tool supplies CBN and fine-grain carbide cutting solutions for die makers and mold manufacturers.
Hard tool steels, tight cavity tolerances, and Class-A surface finish requirements make die and mold machining one of the most technically demanding tooling environments.
Machining hardened tool steel at 48–65 HRC requires CBN and fine-grain carbide tooling with optimized rake geometries and rigid toolholding.
3D cavity profiling demands ball-nose inserts with tight radius tolerances and predictable wear patterns for consistent unattended machining.
Class-A mold surfaces require Ra 0.2 or better — achieved through PCBN finishing inserts, high spindle speeds, and controlled micro-feed rates.
P20 pre-hardened, H13 hot work steel, D2 cold work steel, and S7 shock-resistant steels each require specific substrate and coating combinations.
PCBN and fine-grain carbide solutions matched to hardened tool steels and Class-A surface finish requirements.

Solid PCBN tooling designed for H13 and D2 machining at 60+ HRC.

Fine-grain carbide inserts engineered for 3D cavity profiling in P20 and similar mold steels.

Shallow depth-of-cut, high-feed roughing bodies designed for efficient die block machining.

Fine-bore cartridges designed for ejector pin and core pin bore finishing.
Our engineers will specify PCBN or carbide solutions matched to your steel grade and surface finish requirements.