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

Index: SF51.20.102.165.20XR

Industrial spiral end mill made of solid sintered carbide (VHM) from the SF51  series with a negative design (chip removal downwards). Designed for efficient coarse machining, cutting, and pocketing on CNC machining centres and vertical spindle milling machines. The left-hand screw line (negative) presses the material against the work table, eliminating the risk of tear-out on the upper edge of the workpiece. Three spiral blades with a profiled chip breaker reduce cutting resistance, decrease spindle load, and effectively dampen vibrations during intensive cutting. The ground shank with an accuracy class of H6 protects the drive system and ensures high process stability.

Key technical parameters and properties:

• Three-flute coarse design Z3 (negative): Dedicated coarse profile with downward chip removal presses the workpiece against the table and provides a perfectly finished, clean top edge.
• Premium class sintered carbide monolith (VHM): Rigid monolithic construction minimizes tool deflection under load and guarantees high mechanical durability.
• Geometry with chip breaker: Divides the cut material into smaller fragments, reducing cutting resistance and stabilizing the system's operation.
• Optimised shank roughness: The shank surface features low roughness (Ra ≤ 0.3 µm), which prevents slipping in the holder and protects the spindle taper from wear.
• Dynamic balancing class G2.5: Static-dynamic balancing in accordance with ISO/EN standards (class G2.5) eliminates vibrations at maximum rotational speeds.
• Advanced protective coating NaDia (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.