Three-flute roughing end mill VHM from the SF51 series 

Index: SF51.12.042.090.12R

Industrial spiral end mill made from solid cemented carbide (VHM) from the SF51  series with a negative design (chip removal downwards). Designed for efficient rough machining, cutting, and keyway milling on CNC machining centres and overhead spindle milling machines. The left-hand spiral (negative) compresses the material against the working table, eliminating the risk of breakout 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 intensive cutting. 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 removal compresses the workpiece against the table and provides a perfectly finished, clean upper edge.
• Premium class cemented carbide (VHM): The rigid monolithic design minimizes tool deflection under load and guarantees high mechanical durability.
• Geometry with chip breaker: Divides the machined material into smaller fragments, reducing cutting resistance and stabilizing the operation of the system.
• Optimised shank roughness: The shank surface features low roughness (Ra ≤ 0.3 µm), which prevents slipping in the holder and protects the spindle cone 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.