Three-edge roughing spiral end mill VHM from the SF51 series 

Index: SF51.12.035.083.12XR

Industrial spiral end mill made of solid carbide (VHM) from the SF51 series with a negative design (chip removal downwards). Designed for efficient rough machining, cutting, and slotting on CNC machining centres and overhead milling machines. The left-hand spiral geometry (negative) presses the material down onto the worktable, eliminating the risk of tear-out on the top edge of the workpiece. Three spiral cutting edges with a profiled chip breaker reduce cutting resistance, decrease spindle load, and effectively dampen vibrations during intensive machining. The ground shank meets the H6 accuracy class, protecting the drive system and ensuring high process stability.

Key technical parameters and properties:

• Three-edge roughing design Z3 (negative): Dedicated roughing profile with downward chip removal presses the workpiece to the table and ensures a perfectly finished, clean top edge.
• Premium class solid carbide (VHM): Rigid monolithic design minimizes tool deflection under load and guarantees high mechanical durability.
• Geometry with chip breaker: Divides the material being cut into smaller pieces, reducing cutting resistance and stabilising system operation.
• Optimised grip roughness: The grip surface features low roughness (Ra ≤ 0.3 µm), which prevents slippage in the holder and protects the spindle taper from wear.
• Dynamic balancing in class G2.5: Static-dynamic balancing according to ISO/EN standard (class G2.5) eliminates vibrations at maximum rotational speeds.
• Advanced protective coating NaDia (series .XR): A black PVD coating with extreme hardness of 3650 HV and a very low friction coefficient (0.01–0.05) applied at low temperatures. Drastically increases the edge's wear resistance, prevents material sticking, and significantly extends tool life during the machining of wood, laminates, plywood, plastics, and aluminium.