RUKO LOS-HSSCo-121mm HSS-Co kobolttikierrepora 12,1mm DIN 338 Split Point

With a 12.1 mm cutting diameter and 5% cobalt alloy, this twist drill bit tackles stainless steel, high-alloy steel, and cast iron without losing its edge.

Overview

The RUKO LOS-HSSCo-121mm is a jobber-length twist drill bit made from HSS-Co (high-speed steel with 5% cobalt). Its 135° split point starts on contact, reducing walking and eliminating the need for a centre punch. The bright finish and fully ground flutes ensure smooth chip evacuation and precise holes in demanding materials.

What stands out

• Cobalt alloy withstands high heat, preserving hardness during continuous drilling.
• Split point self-centres, improving accuracy on curved or smooth surfaces.
• DIN 338 geometry with h8 shank tolerance fits standard drill chucks.
• Suited for stainless steel, high-alloy steel, cast iron, non-ferrous metals, and plastics.

Technical details

• Material: HSS-Co (5% cobalt)
• Cutting diameter: 12.1 mm
• Overall length: 151 mm
• Flute length: 101 mm
• Shank: straight
• Point angle: 135° split point
• Standard: DIN 338
• Tolerance: h8

Our verdict

A professional-grade cobalt drill bit that delivers clean, accurate holes in tough metals, built to last under high-temperature conditions.