Somta Extra Long Series Drill - HSS-E Parabolic Flute - 4mm x 175mm

Engineered for deep-hole machining, the Somta Extra Long Series Drill - HSS-E Parabolic Flute - 4mm x 175mm gives you reliable reach when standard bits fall short. Built from HSS-E material, this drill balances hardness and heat resistance to extend tool life in demanding metals.

The extra-long geometry isn’t just about length—it’s about capability. With an overall length of 175 mm and a flute length of 120 mm, you can drill deep into workpieces, minimize repositioning, and maintain straight, accurate starts across bores that other drills can’t reach. The HSS-E substrate further supports durability under prolonged cutting and higher temperatures.

• Parabolic flute for efficient chip evacuation. The wider parabolic flute reduces chip clogging and improves evacuation in deep bores, helping maintain a clean hole and steady cutting action.
• Precise starting and cutting geometry. A 130° point angle with a split point delivers clean entry, reduces walking, and helps you start holes accurately on difficult-to-centre marks.
• DIN 1869 standard, 4 mm shank. This tool adheres to industry-standard dimensions for compatibility with common tooling setups, ensuring a snug fit in collets and chucks.
• Optimized helix and length for deep drilling. The drill features a 40° helix and a flute length of 120 mm, designed to balance aggressive cutting with controlled chip flow.

In practice, this Somta drill shines in applications requiring deep access and dependable performance—think precision bore work in steel housings, long bores in alloy parts, or recessed features where tool changes would disrupt production. The parabolic flute form, together with the long reach, minimizes heat buildup and maintains hole quality across extended drilling cycles.