Somta Long Series Drill - HSS-E Parabolic Flute - 5.8mm

Meet the Somta Long Series Drill - HSS-E Parabolic Flute - 5.8mm, a purpose-built drill bit engineered for deep hole drilling in demanding materials. Its extended length lets you reach through thick workpieces in a single pass, reducing setup changes and boosting productivity.

Crafted from HSS-E (High-Speed Steel-E), this drill bites with exceptional wear resistance and heat tolerance, so you can push speeds and feeds a little more aggressively without sacrificing hole quality or tool life. The 5.8mm diameter maintains precise control, making it ideal for accurate, repeatable deep-hole applications.

Parabolic flute geometry (110) is the standout design feature, delivering rapid chip evacuation and lower cutting forces. The result is smoother drilling, fewer clogging issues, and longer tool life even when working with tough metals like steel and cast iron, as well as aluminum projects.

The sharp cutting edges deliver clean, accurate holes with minimal burrs. The flute design reduces friction and heat buildup, helping you maintain hole alignment and surface finish across long depths and challenging materials.

• Deep-hole capability: long length enables through-holes in thick materials without frequent tool changes
• Durable HSS-E construction for reliable performance under higher speeds and loads
• Efficient chip evacuation through parabolic flute keeps cutting forces down and prevents clogging
• 110-degree point for fast, stable entry and reduced wandering in tough substrates
• Consistent hole quality: clean edges, straight holes, and minimal burrs
• Versatile for metalworking setups: compatible with drill presses, CNC mills, and professional handheld rigs

Ideal for workshops, fabrication shops, maintenance teams, and any operation that requires reliable deep-hole drilling without frequent tool changes. Whether you’re drilling long through-holes in thick steel plates, creating mounting holes in cast iron, or preparing extrusion profiles, this 5.8mm drill bit delivers dependable performance and repeatable results.

Pro tips for best results: pair with appropriate feed rates and coolant when drilling metals, start at a moderate speed and adjust based on material hardness, clamp work securely to prevent deflection, and consider finishing with a deburr step to achieve optimal hole quality.