Meet the Somta Extra Long Series Drill - HSS-E Parabolic Flute - 12mm x 375mm. Designed for deep-hole drilling, this drill bit delivers unprecedented reach without compromising rigidity, making it the go-to choice when through-holes and long bore paths demand precision and reliability.

Built with HSS-E construction, it stands up to the heat and wear of demanding metalworking tasks. The enhanced steel formulation provides excellent durability and extended tool life, so you can count on consistent hole quality across long production runs and tough materials alike.

The parabolic flute design is more than a feature—it changes the drilling experience. Its optimized chip evacuation path clears chips quickly as you bore deeper, reducing clogging, binding, and interruptions. That means smoother starts, fewer stops to clear chips, and higher overall drilling efficiency in deep-hole applications.

The cutting edges are precisely ground for clean, accurate holes right from the first cut, with reduced burr formation. Paired with the parabolic flute geometry, this setup minimizes friction and heat buildup, helping maintain hole diameter and surface finish through extended drill depths.

Key benefits at a glance

• 12 mm diameter with 375 mm overall length for genuine deep-hole capability and through-hole drilling.
• HSS-E composition delivers superior heat resistance and longer tool life in metalworking environments.
• Parabolic flute geometry optimizes chip evacuation, minimizing clogging and improving bore quality on long paths.
• Sharp, durable cutting edges produce clean holes with tight diameter control and reduced burrs.
• Geometry tuned to sustain rigidity and reduce heat buildup during extended drilling sessions.

Ideal use cases and who benefits

This drill is ideally suited for machinists, fabricators, and workshop professionals performing deep drilling in steel, cast iron, and aluminum. Whether you’re machining fixtures, creating long blind holes, or deep-pocket machining, the Somta Extra Long Series Drill provides dependable reach and consistent hole quality. It pairs well with drill presses and CNC machines that require long-reach drilling with reliable chip management and precise hole dimensions.

Practical usage tips

• Secure workpieces firmly and use a controlled feed to start the bore, ensuring the bit tracks true from the first contact.
• Apply appropriate lubrication or coolant to maximize tool life and improve surface finish, especially in harder metals.
• Consider a pilot hole in very hard materials to guide the bit and minimize wandering.
• Progressively bore deeper with consistent feeds to manage heat and rely on the parabolic flutes for continuous chip evacuation.

Experience reliable deep drilling with the Somta Extra Long Series Drill — the 12mm x 375mm HSS-E parabolic-flute bit built for precision, endurance, and long, uninterrupted bore paths.