Somta Extra Long Series Drill - HSS-E Parabolic Flute - 3.5mm x 165mm

Somta Extra Long Series Drill - HSS-E Parabolic Flute, 3.5 mm x 165 mm is the high-reach solution your machining toolkit needs when depth and precision go hand in hand. This drill is purpose-built for deep-hole tasks, delivering dependable performance where standard drills fall short.

The extended 165 mm overall length provides unmatched reach, letting you drill deep into thick workpieces or access recessed cavities without repositioning the part. It’s the kind of versatility that saves time in production settings and simplifies setups in compact workshops.

Crafted from HSS-E (High-Speed Steel Enhanced), this drill offers impressive heat resistance and durability. The result is longer tool life, sustained sharpness, and consistent hole quality even under demanding cutting conditions. You get clean entry, precise hole geometry, and reliable performance across multiple job cycles.

The standout parabolic flute design is engineered to optimize chip evacuation. Deep holes can trap chips and cause binding, but the parabolic flute channels debris efficiently away from the cutting edge. That means fewer interruptions, smoother starts, and reduced risk of hole deviation or wall pinning. The flute geometry also minimizes friction and heat buildup, helping maintain cutting efficiency and extending the life of the tool.

Key specifications

• Diameter: 3.5 mm
• Overall length: 165 mm
• Material: HSS-E (High-Speed Steel Enhanced)
• Flute type: Parabolic

Ideal applications

• Deep-hole drilling in steel, aluminum, cast iron, and other metals where extended reach is essential
• Through-holes and blind-hole work in thick components such as engine blocks, molds, fixtures, and heavy fabrications
• Prototype and production environments where precision, cleanliness, and hole integrity matter

Practical tips for best results

• Use a steady feed and appropriate cutting speed to maximize edge life and hole quality; avoid aggressive feeds that can cause chatter
• Incorporate peck drilling cycles to clear accumulated chips from deep holes and reduce clogging
• Apply a suitable cutting fluid or coolant to extend tool life and improve finish, especially in metals with higher heat generation
• Ensure correct alignment and secure workholding to prevent deflection and maintain true axis drilling