Somta Extra Long Series Drill - HSS-E Parabolic Flute - 8mm x 390mm

When your project demands true depth without sacrificing hole quality, the Somta Extra Long Series Drill – HSS-E Parabolic Flute, 8mm x 390mm, steps up to the challenge. This is a purpose-built drill bit designed to reach deep into workpieces while preserving precision and finish every time.

Key advantages that matter in real-world work

• Exceptional reach with a 390mm overall length, enabling deep-hole drilling in components where standard drills can’t reach without auxiliary tool changes or extended setups.
• HSS-E construction delivers strong wear resistance and improved heat tolerance for demanding drilling tasks, extending tool life in steel, cast iron, aluminum, and other metals.
• Parabolic flute design optimizes chip evacuation, reducing chip clogging and heat buildup that can dull cutting edges or cause wandering holes on deep bores.
• Sharp cutting edges and robust geometry provide clean entry, precise hole size, and minimal burrs, even when drilling through tougher materials or hard-to-reach pockets.
• Consistent performance across extended drilling runs, helping maintain hole straightness and surface finish without frequent tool changes.

Practical use cases

• Deep blind and through-holes in automotive components, machinery housings, and frame parts where access is limited.
• Die and mold work, where cavities require precise, extended-reach drilling without compromising bore quality.
• Maintenance and repair tasks that involve drilling deep access holes in welded assemblies or thick brackets.

Why this Somta drill is a smart choice for your shop

• It reduces the need for multiple tools on a single job by combining long reach with reliable core drilling performance.
• Chip evacuation is optimized by the parabolic flute, which translates to less rework from clogged holes and smoother drilling in deep bores.
• The tool’s durability translates to fewer tool changes, lower downtime, and better productivity in high-volume or precision-focused environments.

Best practices for maximum life and precision

• Use appropriate cutting fluid or coolant to manage heat; apply along the flute to assist chip removal without washing away lubrication at the cutting edge.
• Begin with a light pilot or center drill when working in hard materials to guide the bit and reduce deflection.
• Adopt a measured pecking approach to clear chips and prevent heat buildup when drilling deep holes.
• Secure the workpiece firmly and choose spindle speeds and feeds suitable for an 8mm diameter drill in your material for a clean, accurate bore.

Specifications at a glance

• Diameter: 8 mm
• Overall length: 390 mm
• Material: HSS-E (High-Speed Steel - Enhanced)
• Flute type: Parabolic for efficient chip evacuation