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

Index: SF51.14.050.110.14XR

Industrial spiral end mill made from solid tungsten 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 overhead spindle milling machines. The left-hand helix (negative) presses the material against the worktable, eliminating the risk of tearing on the upper edge of the workpiece. Three spiral cutting edges with a profiled chip breaker reduce cutting resistance, lower spindle load, and effectively dampen vibrations during intensive cutting. The ground shank in H6 accuracy class protects the drive system and ensures high stability of the process.

Key technical parameters and properties:

• Three-flute roughing design Z3 (negative): Dedicated roughing profile with downward chip evacuation presses the workpiece against the table and ensures a perfectly finished, clean top edge.
• Premium monolithic tungsten carbide (VHM): Rigid monolithic construction minimizes tool deflection under load and guarantees high mechanical durability.
• Geometry with chip breaker: Splits the machined material into smaller pieces, reducing cutting resistance and stabilizing the operation of the system.
• Optimised shank roughness: The shank surface has low roughness (Ra ≤ 0.3 µm), preventing slipping in the holder and protecting the spindle taper from wear.
• Dynamic balancing class G2.5: Static-dynamic balancing in accordance with ISO/EN standard (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.