Somta Extra Long Series Drill - HSS-E Parabolic Flute, 15mm x 380mm is purpose-built for deep-hole work where reach, precision, and durability collide in one reliable tool. Crafted for fast, clean penetrating cuts, this drill couples long unobstructed reach with advanced cutting geometry to deliver consistent results even in challenging workpieces.

Designed for deep-hole drilling applications, the Extra Long Series Drill extends into recessed interiors, machine cavities, and through-holes that would stymie shorter bits. The 380mm flute length provides ample reach without sacrificing rigidity, helping you maintain straightness and accuracy from pilot entry to final bore. When precision matters, this tool keeps your hole geometry true from start to finish.

High-Performance HSS-E Construction
The HSS-E (High-Speed Steel Enhanced) composition delivers superior heat resistance, wear resistance, and extended tool life. It stands up to high feed rates and continuous drilling where temperatures rise, reducing the need for frequent tool changes and keeping production lines moving. The result is dependable performance across a range of metals, with tougher alloys maintaining edge integrity longer than standard high-speed steel bits.

Parabolic Flute for Vigorous Chip Evacuation
Chip management is critical in deep drilling. The parabolic flute geometry on this Somta drill is engineered to evacuate chips efficiently as depth increases, minimizing clogging and reducing heat buildup. That means smoother drilling, fewer stall moments, and less clog-induced wear. Clean chip evacuation also improves hole quality, helping you achieve consistent diameters and surface finishes even at greater depths.

Sharp Cutting Edges & Robust Geometry
A precisely honed cutting edge paired with a strong flute profile yields clean, accurate holes with minimal burr formation. The geometry is optimized to reduce friction and thrust, enabling steady penetration in through-holes and blind holes alike. You’ll notice smoother entry, steadier feeds, and more predictable hole diameters—key advantages for assemblies that demand tight tolerances.

Ideal Use Scenarios
- Deep-hole drilling in engine blocks, molding cores, hydraulic components, and other parts with recessed features.
- Maintenance and repair work where access is restricted and longer reach is essential.
- Precision manufacturing environments where hole straightness and surface finish are critical for subsequent operations (threads, bushings, or mating surfaces).

Compared to standard-length drills, the Somta Extra Long Series offers extended reach without compromising core strength or edge integrity. This balance makes it a practical upgrade for shops that routinely encounter deep bores, cavities, or internal features that would otherwise require repositioning or multiple setups.

Practical Tips for Best Results
- Use a controlled peck drilling approach to clear chips and prevent packing, especially in deeper bores. Pause briefly to evacuate debris before continuing the cut. - Maintain adequate lubrication or coolant to manage heat, preserve edge life, and improve finish. - Align and secure workpieces firmly; let the long flute do the work without excessive lateral load that could induce deflection. - Start with a pilot hole if the material is particularly tough or if you’re drilling a blind bore, then progress to the full 15mm diameter. - After use, inspect the cutting edge for signs of wear or chipping and schedule re-sharpening as needed to preserve hole quality.

The image below showcases the Somta design in its full profile, highlighting the clean lines, robust flute geometry, and the extended reach that defines this drill.

Who benefits most from the Somta Extra Long Series Drill? engineers and machinists who demand reliability, precise hole geometry, and the ability to reach deep into workpieces without changing tools. It combines the best of both worlds: the toughness and wear-resistance of HSS-E with the efficiency of a parabolic flute, making it a versatile addition to any metalworking arsenal.

In everyday terms, this drill helps you cut fewer corners on deep bore projects. You’ll experience fewer tool changes, steadier hole quality, and a longer tool life that translates into real-world savings over time. For shops prioritizing accuracy, efficiency, and repeatable results, the Somta Extra Long Series Drill is the trusted choice for deep-hole tasks conducted with consistency and confidence.