The Somta Extra Long Series Drill - HSS-E Parabolic Flute, 8.5mm x 240mm, is a purpose-built tool for deep-hole drilling that demands extended reach without sacrificing precision.

Constructed from HSS-E (high-speed steel-enhanced), this drill bit combines toughness with heat resistance to deliver reliable performance across demanding materials. The extra-long 240mm length enables you to reach deep features, through-thole workpieces, or thick plates in a single setup, reducing the need for multiple tools or setups.

The standout parabolic flute design optimizes chip evacuation. In deep bores, chip buildup can slow cutting and heat the tool; the parabolic geometry channels chips efficiently away from the cutting edge, maintaining a smooth, stable cut and reducing the risk of clogging. This translates to cleaner holes, steadier feeds, and longer tool life even in challenging materials.

Key benefits you’ll notice in real-world use:

• Extended reach for deep holes: 8.5mm diameter with a 240mm flute length supports long through-holes and deep pockets in steel, aluminum, and other common metals.
• Precise hole quality: Sharp cutting edges foster clean, true diameters and minimize drift, even when drilling into hard or thick workpieces.
• Efficient chip control: Parabolic flute geometry reduces friction and heat buildup, helping maintain cutting efficiency and reducing cycle times.
• Durable, heat-tolerant construction: HSS-E resists wear and maintains performance under higher cutting temperatures, extending tool life in tough jobs.
• Versatile for multiple materials: Suitable for ferrous and non-ferrous metals, as well as alloys commonly encountered in automotive, aerospace, and heavy fabrication.

Ideal use scenarios include repairing or fabricating deep bores in engine blocks, long through-holes in molds and fixtures, thick structural components, and any project where access is limited but hole quality must remain exact. It’s especially valuable for professionals who routinely tackle deep-pocket drilling, long-reach projects, or jobs that require drilling with high accuracy over extended LENGTHs.

Practical tips for optimal performance:

• Match speed and feed to the material: higher speeds with cautious feeds for softer metals, and conservative feeds for harder alloys to prevent overheating.
• Use peck drilling to clear chips without losing concentricity—pause periodically to retract and lift chips away from the flute.
• Maintain proper lubrication or flood coolant to manage heat and extend edge life on tougher workpieces.
• Secure the drill firmly in a chuck or collet to preserve alignment and minimize runout during deep-hole drilling.

With the Somta Extra Long Series Drill, you’re getting more than a drill bit—you’re gaining a reliable solution for deep-hole complexity. It stands out in its class by marrying extended reach with an efficient chip evacuation system, delivering consistent hole quality and longer tool life in a single, practical tool.