Somta Extra Long Series Drill - HSS-E Parabolic Flute - 8.5mm x 390mm

HSS-E durability for demanding metals

The HSS-E composition in this Somta drill is chosen for its superior edge retention and heat tolerance during high-speed drilling. When you’re pushing through steel, cast iron, or other robust ferrous materials, you’ll notice steadier cutting action, cleaner holes, and longer tool life compared to standard high-speed drills.

Parabolic flute design for efficient chip evacuation

The parabolic flute geometry isn’t just a detail—it’s a practical advantage. It channels chips away from the cutting edge more effectively, reducing clogging and heat buildup. In deep-hole work, this translates to fewer interruptions, smoother drilling progress, and improved hole quality even as the depth increases.

Precise, clean hole formation

With sharp cutting edges and a geometry optimized for straight, concentric holes, this drill minimizes burr formation and ensures accurate hole size. The combination of reach, rigidity, and effective chip control makes it well-suited for precision tasks where hole alignment and finish matter.

Ideal use cases and who benefits most

• Deep-hole drilling in steels, stainless steels, cast iron, and other tough metals
• Long-reach drilling on CNC machines, drill presses, or machine centers where access is limited
• Maintenance and repair work involving thick components or assemblies with deep cavities
• Fabrication and automotive applications requiring reliable long-reach through-holes

Practical tips for best results

• Secure the workpiece firmly and, if possible, support the underside to minimize deflection during deep drilling.
• Begin with a light feed to establish a clean pilot path, then increase feed gradually while maintaining steady cutting speed.
• Use appropriate cutting fluid or lubrication to reduce heat buildup and extend tool life, especially with tougher metals.
• Employ intermittent pecking to clear chips and prevent chip packing in deep holes; raise the drill slightly between pecks to flush debris.
• Keep the drill perpendicular to the work surface to maintain hole concentricity and prevent wander in the entry cut.

When reach and reliability are essential for your deep-hole projects, the Somta Extra Long Series Drill - HSS-E Parabolic Flute delivers consistent performance, precise holes, and longer service life in demanding metalworking environments.