Somta Long Series Drill - HSS-E Parabolic Flute - 4.2mm

The Somta Long Series Drill in a precise 4.2 mm diameter is purpose-built for deep-hole drilling in thick, demanding materials. Crafted with HSS-E (High-Speed Steel-E) for exceptional durability and heat resistance, this bit keeps its edge where standard drills falter, delivering consistent performance from first plunge to the deepest exit.

Key features that matter when you’re machining hard, thick workpieces

• Long series design for deep-through holes and substantial material thicknesses without stalling or deflection.
• HSS-E construction provides enhanced wear resistance and heat tolerance, extending tool life in high-pressure drilling tasks.
• Parabolic flute geometry and a refined flute profile optimize chip evacuation, reducing built-up edge and minimizing cutting forces for smoother cuts and steadier feeds.
• Clean, precise holes with sharp cutting edges that produce accurate hole size and smooth bore surfaces, even in tougher metals.
• Efficient heat management the flute design aids in heat dispersal, helping maintain cutting performance and reducing the risk of workpiece hardening or tool thermal damage.

Why this drill stands out in real-world use

When you're drilling thick stock, warping and wandering are common hazards. The Somta Long Series Drill’s robust HSS-E alloy resists those challenges, while the parabolic flute keeps chips moving away from the cutting edge. That combination means fewer re-positions, less downtime, and more reliable hole quality across multiple passes.

Ideal applications and use scenarios

• Through-holes in thick plates and blocks made from mild steel, alloy steel, and other common metals.
• Automotive and aerospace component fabrication where precision deep-hole drilling is routine.
• Tooling, die making, and mold machining tasks that demand consistent bore quality over long drill strokes.
• Prototyping and small-batch production where repeatable hole size and surface finish matter.

Operational guidelines for best results

• Start with a steady, moderate feed and pause to clear chips during the cut to maintain a clean bore and consistent diameter.
• Use appropriate cutting fluid or coolant to maximize tool life and reduce heat buildup in deep holes.
• Peck drilling in measured intervals can help evacuate chips and prevent clogging in long drills.
• Match spindle speed to material type and hole depth to optimize the balance between cutting efficiency and surface finish.

Who benefits most from the Somta Long Series Drill

Engineers, machinists, and fabricators who routinely bore deep holes in thick workpieces will appreciate the combination of long reach, durable HSS-E construction, and chip-friendly parabolic flute geometry. It’s a single-tool solution that reduces tool changes and delivers dependable hole quality from project start to finish.

Upgrade your deep-hole drilling workflow with the Somta Long Series Drill in 4.2 mm—engineered for reliability, precision, and long-term performance in tough materials.