The Somta Extra Long Series Drill - HSS-E Parabolic Flute - 10mm x 340mm is purpose-built for deep-hole work where reach and reliability truly matter. Its extended length lets you access recessed bores and long workpieces without compromising rigidity or accuracy, making it an essential tool for metalworking projects that demand precision in hard-to-reach areas. This extra-long reach is a deliberate design choice for deep drilling tasks.

Key advantages that set it apart

• HSS-E (cobalt-based) construction delivers superior heat resistance and longer tool life under demanding drilling conditions, so you can push deeper with confidence.
• Parabolic flute design provides a larger, more open channel for chip evacuation, reducing chip clogging and smoothing the cutting process in deep holes. This geometry is specifically optimized for continuous deep-hole work.
• Sharp cutting edges and controlled geometry help produce clean, accurate holes with minimal rework, while the parabolic web minimizes friction and heat buildup during progressive drilling.
• Designed for long-reach drilling without pecking—perfect for long bore applications where standard drills struggle to reach or maintain hole quality. Many deep-hole drill guidelines highlight parabolic flutes as a preferred solution for extended-depth work.

Ideal use cases and who benefits most

This drill is ideal for metalworking environments that routinely require deep, precise holes in steel, stainless steel, aluminum, and other common machinable metals. Think automotive assemblies, mold and die manufacture, hydraulic components, long through-holes in housings, and any project where access is a challenge and hole quality matters. The extended length pairs with its parabolic flute to deliver reliable chip evacuation and consistent hole geometry in long bores.

How to maximize performance

• Use a peck drilling strategy for depths exceeding several diameters to promote steady chip removal and reduce heat buildup. A controlled, intermittent cutting cycle keeps the edge cooler and extends tool life.
• Apply appropriate cutting fluid or coolant to further improve chip evacuation and surface finish, especially on harder metals.
• Keep the bit aligned perpendicularly to the workpiece to maintain hole straightness through the entire depth of cut. Deep-hole guidance references emphasize that flute design and chip management are critical for accuracy.

Technical specs at a glance

• 10 mm
• 340 mm
• about 235 mm (typical for 10x340 length, per DIN standards)
• HSS-E (cobalt-based High-Speed Steel)
• Parabolic
• approximately 130°
• Straight shank for compatibility with common drilling machines and CNCs