Somta Long Series Drill - HSS-E Parabolic Flute - 4.9mm

Meet the Somta Long Series Drill - HSS-E Parabolic Flute - 4.9mm, a purpose-built solution for precise, deep-hole drilling in demanding metals. Designed to maintain rigidity and accuracy as the hole depth increases, this drill bit delivers consistently clean holes even in thick workpieces.

Why this long-reach drill stands out

• Long series for deep holes: Extended flute length keeps the cutting edge aligned with the workpiece through substantial depths, reducing deflection and maintaining straight, concentric holes.
• HSS-E construction: High-Speed Steel Enhanced builds resilience against heat and wear, extending tool life when drilling tough metals and thick sections.
• Parabolic flute geometry: A purposefully shaped flute accelerates chip evacuation and lowers cutting forces, helping to prevent clogging and minimize thermal buildup during prolonged cuts.
• Sharp cutting edges and robust geometry
: Precise, consistent entry and clean hole geometry with minimal burrs, even in challenging materials.
• Efficient heat management: The parabolic flute and edge design work together to reduce friction and heat, preserving tool integrity over more holes per edge life.

Ideal applications and use cases

This 4.9mm drill excels in deep-hole tasks across a range of materials, including steel, stainless steel, aluminum, and other hard-to-machine metals. It’s especially well-suited for through-holes, cabinet and machinery fabrication, automotive components, and structural work where hole depth and accuracy matter more than the initial entry alone.

Practical tips for best results

• Use a sturdy drilling setup (drill press or CNC spindle) to preserve alignment over long holes.
• Consider a light pilot hole or a stepped approach to reduce wandering and improve starts in thick workpieces.
• Apply steady, moderate feed and ample coolant or lubrication to minimize heat and extend tool life.
• In long drilling cycles, employ short pecking intervals to clear chips and prevent chip packing that can degrade hole quality.
• Keep the bit sharp and inspect the parabolic flute for any signs of wear; a sharp edge ensures cleaner holes and longer overall life.

Engineered for professionals who demand reliability from every deep-hole operation, the Somta Long Series Drill - HSS-E Parabolic Flute - 4.9mm helps you complete challenging projects with confidence, precision, and efficiency. Add it to your toolkit and experience smoother drilling, fewer reworks, and extended tool life in thick or hard materials.