The Somta Extra Long Series Drill - HSS-E Parabolic Flute (15mm x 310mm) is purpose-built for deep-hole work where reach and reliability matter most. This long-reach drill blends precision engineering with tough, industrial-grade performance to tackle holes that standard bits simply can’t address.

Why this drill stands out:

• Extended reach for deep holes: At 310mm overall length, it cleanly reaches into workpieces where shorter bits struggle, reducing the need for multiple setups or extensions.
• HSS-E durability: The high-speed steel alloy with excess toughness delivers better heat resistance and longer tool life when drilling through steel, stainless steel, cast iron, and similar tough materials.
• Parabolic flute geometry: Designed to optimize chip evacuation, it minimises clogging and maintains steady cutting action, which enhances hole quality and reduces dwell time between pecks.
• Sharp, consistent cutting edges: Precisely ground edges produce clean, accurate holes with minimal exit burrs, even in hard-to-reach areas.
• Controlled heat and friction: The flute design and robust construction work together to reduce heat buildup, helping to preserve dimensional accuracy and prolong drill life in demanding applications.

Ideal use scenarios:

• Automotive and aerospace components where deep, straight holes are required for fasteners or cooling passages.
• Mold, die, and fixture fabrication where long reach enables drilling through thick sections without repositioning the workpiece.
• Fabrication and maintenance tasks involving thick plates or assemblies in steel, stainless steel, and cast iron.

Practical tips for best results:

• Pair with a rigid setup and accurate workholding to maintain alignment over the full length of the drill.
• Use peck drilling cycles to break chips and control heat—advance, retract to clear chips, and resume.
• Apply appropriate cutting fluid or coolant to sustain cutting efficiency and extend tool life, especially when drilling harder materials.
• Start with a pilot hole if possible to guide the bit and reduce wandering on initial entry.
• Inspect and remove chips regularly to prevent chip packing, which can impact hole quality and drill performance.

With the Somta Extra Long Series Drill, you gain dependable depth capability, precise hole quality, and the resilience needed for demanding fabrication jobs. It’s the go-to choice when a standard drill just won’t reach, delivering consistent results from first entry to final drill.