The Somta Extra Long Series Drill is built to conquer deep-hole challenges with precision and reliability. Designed for long-reaching drilling tasks, this 16 mm diameter drill delivers consistent hole quality from the surface down to the workpiece’s deepest layers, making it a standout choice for thick materials and intricate assemblies.

Key benefits at a glance

• Extended reach for deep holes — with a 400 mm length, this drill bit lets you reach through long workpieces, skip multiple setups, and maintain alignment for accurate hole placement.
• HSS-E construction for durability — engineered for higher heat resistance and longer tool life in demanding materials, so you can drill more holes between sharpenings.
• Parabolic flute design for effortless chip evacuation — designed to move chips away quickly, reducing clogging and ensuring smooth, steady cutting even as depths increase.
• Sharp cutting edges for clean, accurate holes — precise geometry produces true holes with minimal wobbly start or deflection, supporting tight tolerances in fixture work.
• Efficient flute geometry to minimize heat — reduced friction and heat buildup translate to less wear and steadier performance in a range of metals.

What problems it solves

• Unable to reach deep into thick workpieces with standard-length bits
• Chip buildup causing irregular holes or return passes
• Premature wear and reduced tool life during extended drilling sessions
• Need for consistently located, through-holes or blind holes without rework

Ideal applications and users

• Machinists and factory technicians performing deep-hole drilling in steel, cast iron, and other robust alloys
• Fabrication shops and maintenance teams tackling long through-holes and thick workpieces
• Aerospace, automotive, and heavy industry environments where reliable deep-reach drilling is essential

Practical guidance for best results

• Pair with a sturdy drill press or CNC milling machine capable of maintaining stable feeds and gentle pecks to clear chips as you go.
• Use appropriate cutting fluid or coolant to maximize tool life and reduce heat, especially on tougher materials.
• Keep the workpiece securely clamped and aligned to preserve hole accuracy across long depths.
• Inspect the flute and cutting edges regularly; with extended use, maintaining sharpness is key to preserving hole quality.