Somta Long Series Drill - HSS-E Parabolic Flute - 4.5mm

Meet the Somta Long Series Drill - HSS-E Parabolic Flute, 4.5mm, a purpose-built solution for deep-hole drilling in metal and engineered materials. Its extended length lets you reach through thick workpieces with confidence, delivering accurate, straight holes where shorter bits struggle to keep alignment.

Built from HSS-E (High-Speed Steel with enhanced toughness and heat resistance), this drill bit is designed to weather the heat and wear of demanding jobs. The parabolic flute geometry actively clears chips, pulling debris away from the cutting edge and reducing cutting forces. That means steadier starts, fewer clogging stops, and cleaner holes from entry to exit. The 4.5mm diameter provides precise control for small-diameter deep holes, while the 110° point ensures a sharp, true initial bite on a variety of materials.

What this means in practical terms is greater reliability in demanding fabrication and machining tasks. The long length minimizes the need for multiple bit changes during through-holes, saving time and reducing restaging errors. The parabolic flute design lowers friction and heat buildup, extending tool life even when you’re drilling in tougher steels or thick aluminum sections. Expect smoother hole walls, minimal burrs, and improved concentricity, which makes deburring and threaded inserts easier down the line.

This drill bit is ideal for professionals and serious hobbyists who routinely tackle:

• Deep-hole drilling in steel, stainless steel, and aluminum components
• Through-holes in thick stock where standard bits underperform
• Fabrication, automotive, and machinery applications requiring precise, clean holes
• CNC or manual drilling setups where consistent chip evacuation matters

Key benefits at a glance:

• Long length for deep holes and through-holes in thick materials
• HSS-E composition for superior heat resistance and durability
• Parabolic flute for efficient chip evacuation and reduced cutting forces
• Sharp cutting edges and precise entry for clean hole quality
• 110° point for reliable starts and reduced wandering on tough substrates

Pro tips for best results:

• Secure the workpiece firmly and use a drill press when possible to maintain exact alignment.
• Use a light cutting fluid or coolant to control temperature and extend tool life.
• Employ a peck drilling approach to periodically retract the bit and clear chips, especially in deeper holes.
• Start with a light feed and gradually increase as the bit engages to prevent wandering.
• Maintain a steady RPM appropriate for the material to optimize chip formation and hole finish.
• Inspect the flute and cutting edges regularly; replace if signs of dulling or chipping appear to maintain hole quality.

Whether you’re upgrading your shop’s drilling toolbox or equipping a precision-focused fabrication line, the Somta Long Series Drill - HSS-E Parabolic Flute, 4.5mm, is a dependable choice for deep, accurate holes with minimal fuss. Its blend of toughness, heat resistance, and chip-management efficiency translates into real-world time savings, better hole quality, and longer-lasting tooling in challenging materials.