Three-flute roughing end mill VHM from the SF51 series 

Index: SF51.12.052.100.12XR

Industrial spiral end mill made from a solid carbide (VHM) from the SF51  series with a negative geometry (chip ejection downwards). Designed for efficient rough machining, plunging, and pocketing on CNC machining centres and high-speed milling machines. The left-hand spiral design (negative) presses the material against the work table, eliminating the risk of tear-outs 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. Ground shank in accuracy class H6 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 ejection presses the workpiece against the table and ensures a perfectly finished, clean upper edge.
• Premium solid carbide (VHM): Rigid monolithic construction minimizes tool deflection under load and guarantees high mechanical durability.
• Geometry with chip breaker: Breaks the machined material into smaller pieces, reducing cutting resistance and stabilising the operation of the system.
• 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 in accordance with ISO/EN standards (class G2.5) eliminates vibrations at maximum rotational speeds.
• Advanced protective coating NaDia (XR series): 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 cutting edge's wear resistance, prevents material sticking, and significantly extends tool life during the machining of wood, laminates, plywood, plastics, and aluminium.