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

Index: SF51.20.072.120.20XR

Industrial spiral end mill made from solid carbide (VHM) from the SF51 series with a negative design (chip removal downwards). Designed for efficient rough machining, cutting, and grooving on CNC machining centres and surface milling machines. The left-handed screw line (negative) presses the material against the work table, eliminating the risk of chipping on the upper edge of the workpiece. Three spiral flutes with a profiled chip breaker reduce cutting resistance, decrease spindle load, and effectively dampen vibrations during intense cutting. The ground shank in class H6 precision protects the drive system and ensures high process stability.

Key technical parameters and properties:

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