Somta Extra Long Series Drill - HSS-E Parabolic Flute, 12mm x 480mm

When precision meet reach, you unlock a new level of drilling capability. The Somta Extra Long Series Drill is purpose-built for deep-hole work, delivering reliable performance in challenging cavities and thick workpieces. With a generous 480 mm overall length, this drill bit was designed to access concealed bore geometries without sacrificing control or stability at the point of cut.

Constructed from HSS-E (High-Speed Steel with enhanced alloying), it combines exceptional durability with superior heat resistance. That means longer tool life, fewer regrinds, and consistent hole quality even under demanding feeds and high-speed conditions. The parabolic flute geometry actively guides chips away from the cutting zone, dramatically improving chip evacuation and reducing chip clogging that can derail deep drilling operations.

Key to its performance is a precisely ground 12 mm cutting diameter that delivers clean, accurate holes with minimal burr when used on steel, cast iron, aluminum, and selected non-ferrous materials. The parabolic flutes halve the friction and resist heat buildup, helping you maintain consistent hole size across long drill passes and reducing tool wear over time.

Who should use this drill? It’s ideal for machinists, moldmakers, automotive and aerospace shops, and DIY enthusiasts tackling deep cavity drilling, slotting into thick workpieces, or reaching through assemblies where standard-drill lengths fall short. If your project demands sustained performance at depth, this drill bit keeps diameter tolerance tight and hole straight from start to finish.

Practical tips to get the most from the Somta Extra Long Series Drill:

• Use a pilot hole or center drill to establish alignment before plunging into thicker materials.
• Peck drilling in controlled increments helps evacuate chips and reduces heat; back off periodically to rinse away debris.
• Ensure firm workholding and minimal runout to maintain straightness over the full 480 mm length.
• Apply appropriate cooling or lubrication for steel and harder alloys to extend tool life and improve finish.
• Match spindle speed and feed rate to the material being drilled; start with conservative speeds and adjust based on chip color and hole quality.
• Inspect the flute and cutting edge after use and re-sharpen when needed to preserve hole accuracy.

Compared to standard-length drills, the Somta Extra Long Series offers a decisive advantage in reach and sustained performance—combining robust HSS-E construction with efficient chip evacuation to minimize clogging and heat at depth. For engineers and hobbyists who routinely drill behind fixtures, into recesses, or through multi-layer stacks, this tool provides dependable, repeatable results you can trust project after project.