Somta Extra Long Series Drill - HSS-E Parabolic Flute - 7.5mm x 370mm

When precision meets extended reach, the Somta Extra Long Series Drill delivers dependable deep-hole performance in a compact, easy-to-handle package. This 7.5 mm diameter drill bit extends to a generous 370 mm length, giving you uninterrupted access to long cavities and hard-to-reach workpieces without constant repositioning.

High-performance material for demanding jobs
The Somta Extra Long Series Drill is built from HSS-E (high-speed steel with cobalt-enhancement), blending exceptional hardness with heat resistance. This combination helps maintain a sharp cutting edge under sustained cutting forces, delivering reliable hole quality even as temperatures rise during extended drilling sessions. The result is longer tool life and fewer tool changes in busy production cycles.

Parabolic flute geometry for superior chip evacuation
A defining feature of this drill is its parabolic flute design. The wider, deeper flute pathway acts as a fast-carrier for chips, reducing clogging and heat build-up that plague long-hole drilling. With improved chip evacuation, you can drill deeper holes with steadier progress and fewer interruptions, keeping your workflow smooth and consistent. This geometry also helps minimize friction along the flute walls, contributing to straighter holes and better surface finish.

Designed for long reach, without compromising accuracy
Thanks to its extra-long form, this drill maintains rigidity and stability through long-length operations. The combination of precise ground cutting edges and a robust web structure supports clean, accurate holes even in demanding geometries. Whether you’re piercing into thick components or drilling through extended payloads, you’ll experience reliable alignment and consistent hole quality from start to finish.

Ideal applications and workflows
- Deep-hole drilling in automotive, hydraulic, and aerospace components where access is limited and precision matters.
- Long through-holes in fabrications, engine blocks, fixtures, and tooling where a standard-length drill would require reorientation or multiple passes.
- Situations that demand consistent chip control to minimize peck drilling cycles and maximize uptime.

Practical guidance for best results
- Use steady feeds that match the material and hole depth, and avoid overheating by maintaining adequate lubrication or coolant where appropriate.
- Secure the workpiece firmly to prevent runout, and ensure the drill is properly aligned with the entry point to preserve hole straightness.
- For deep-hole work, plan a light pecking rhythm if needed, but the parabolic flute design often reduces the frequency of withdrawals, helping maintain productivity.

Why this Somta drill stands out
Somta’s reputation for reliable, long-length tooling is amplified by the combination of HSS-E durability and parabolic flute efficiency. This drill is purpose-built for deep holes—delivering clean edges, predictable hole geometry, and extended tool life in a single, easy-to-use bit. It’s a practical upgrade for shops that regularly perform long-reach drilling tasks and want to minimize tool changes without sacrificing quality.

Ready to tackle deep-hole projects with confidence? Add the Somta Extra Long Series Drill—HSS-E Parabolic Flute, 7.5 mm x 370 mm—to your toolkit and experience smoother chip management, stronger cutting performance, and reliable, repeatable hole quality project after project.