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

Index: SF51.16.055.110.16XR

Industrial spiral end mill made from a solid carbide (VHM) from the SF51  series with a negative design (chip ejection downwards). Designed for efficient rough machining, parting, and grooving on CNC machining centres and overhead spindle milling machines. The left-handed helical design (negative) presses the material against the worktable, eliminating the risk of tear-out on the upper edge of the workpiece. Three spiral blades with a profiled chip breaker reduce cutting resistance, lower spindle load, and effectively dampen vibrations during intense machining. The ground shank in accuracy class H6 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 ejection presses the workpiece against the table and ensures a perfectly finished, clean upper edge.
• Premium class solid carbide (VHM): Rigid monolithic design minimises tool deflection under load and guarantees high mechanical durability.
• Geometry with chip breaker: Divides the material being machined into smaller pieces, reducing cutting resistance and stabilising operation.
• Optimised shank roughness: The shank surface is characterised by 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 in accordance with ISO/EN standard (class G2.5) eliminates vibrations at maximum rotational speeds.
• Advanced protective NaDia 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 edge's wear resistance, prevents material sticking, and significantly extends tool life during the machining of wood, laminates, plywood, plastics, and aluminium.