RUKO LOS-HSSCo-140mm HSS-Co 5% Cobalt Twist Drill Bit 10mm DIN 340 Long Series

Precision-ground from high-speed steel with 5% cobalt, this 10 mm twist drill bit delivers high heat and wear resistance for demanding metalworking tasks. Its 135° split point self-centers on contact, eliminating the need for center punching and reducing walking on hard materials.

Overview

The RUKO LOS-HSSCo-140mm is a long-series twist drill bit manufactured to DIN 340 standards. With a total length of 140 mm and a working length of 94 mm, it provides extended reach for deep-hole drilling in stainless steel, acid-resistant steel, heat-resistant steel, cast iron, high-alloy steel, bronze, and hard plastics. The fully ground bright finish ensures smooth chip evacuation and consistent performance.

What stands out

• 5% cobalt alloyed HSS for superior hardness and thermal stability
• 135° split point tip for accurate, self-centering starts
• Long series design for deep drilling applications
• Fully ground flutes for efficient chip removal
• Right-hand cutting direction for standard rotation

Technical details

• Drill bit type: Twist drill bit
• Material: High-speed steel cobalt (HSS-Co)
• Cobalt content: 5%
• Diameter: 10.0 mm
• Total length: 140 mm
• Working length: 94 mm
• Shank type: Cylindrical
• Shank diameter: 10.0 mm
• Point angle: 135°
• Tip type: Split point
• Flute type: Standard spiral flute
• Standard compliance: DIN 340
• Cutting direction: Right-hand
• Manufacturing process: Fully ground
• Surface finish: Bright (uncoated)

Our verdict

A robust cobalt drill bit engineered for professional metal drilling. Its split point and long flute geometry make it a reliable choice for deep, accurate holes in tough alloys.