Somta Long Series Drill - HSS-E Parabolic Flute - 3.5mm

When tackling deep hole drilling in tough metals, the Somta Long Series Drill delivers reliable performance where standard bits fall short. Its extended length reaches through thick workpieces without constant repositioning, while the HSS-E cobalt construction maintains sharp cutting edges even under high heat and friction.

The parabolic flute geometry sets this 3.5 mm drill apart by efficiently clearing chips from the hole, reducing the risk of clogging and minimizing the need for peck cycles. This design lowers cutting forces, preserves tool life, and produces cleaner, more accurate holes in materials like stainless steel, alloy steels, and cast iron. Machinists in toolmaking, mold repair, and maintenance shops rely on this bit for applications where reach and consistency matter most. The reduced friction and heat buildup allow steady feed rates, protecting both the drill and the workpiece surface from galling or work-hardening. Whether creating long lubrication channels, pilot holes in thick assemblies, or precision bores in jigs and fixtures, this Somta drill combines reach with durability to handle demanding jobs without premature failure.