Somta Long Series Drill - HSS-E Parabolic Flute - 4.4mm

Meet the Somta Long Series Drill - HSS-E Parabolic Flute - 4.4mm, a precision drill designed for serious deep-hole work. Built for durability and consistency, this 110 mm class long-series drill delivers reliable performance when you need holes through thick material without frequent tool changes.

Why professionals reach for this drill:

• Long-length capability for deep holes: The extended reach is ideal for drilling through thick plates, brackets, and structural components in a single pass, reducing setup time and rework. This is the kind of tool you reach for when a standard drill just won’t cut it.
• HSS-E construction for durability and heat resistance: High-Speed Steel with an enhanced alloy composition stands up to higher cutting temperatures, delivering longer tool life in demanding metals like stainless steel and tough alloys. (Supported by Somta’s parabolic, long-series designs and material claims.)
• Parabolic flute design for efficient chip evacuation: Wide, curved flutes promote rapid chip removal, minimizing clogging and reducing cutting forces that can cause deflection or chatter during deep drilling. This geometry helps you maintain a steady, accurate hole from start to finish.
• Sharp cutting edges for clean holes: The parabolic form and precise edge geometry work together to deliver clean entry and exit holes with minimal burrs, improving fit and finish on mechanical assemblies.
• Friction and heat management through flute geometry: The parabolic flute reduces contact area and heat buildup, contributing to smoother cuts and extended tool life during repeated deep-hole cycles.

Ideal use cases

This drill excels in metalworking environments where deep, accurate holes are a daily requirement. Typical applications include drilling through thick steel plates, steel frames, cast iron housings, and other heavy fabrication tasks. It’s well-suited for stainless steels and other demanding alloys where heat resistance and hole quality matter most.

How it compares and best practices

Compared with standard-depth drills, this long-series, parabolic-flute design improves chip evacuation and stabilizes cutting in deep holes, helping you achieve consistent hole quality with fewer tool changes. For best results, follow these practices:

• Secure the workpiece and use a drill press or CNC with appropriate feeds to minimize drift.
• Start with a small pilot if needed to guide the hole and prevent wandering.
• Apply coolant or cutting oil to control heat, especially when drilling stainless steels or alloys.
• Use a peck drilling technique to periodically clear chips without overheating the tool.

Specs at a glance

Diameter: 4.4 mm • Overall length: 110 mm • Material: HSS-E • Flute: Parabolic