RUKO LOS-HSSCo-89mm HSS-koboltti-kierrepora 8,9 mm DIN 338

Precision-ground from high-speed steel with 5% cobalt, this RUKO twist drill bit delivers a 135° split point for immediate self-centering and reduced thrust. The 8.9 mm diameter and 89 mm working length make it a dependable choice for demanding metalworking tasks.

Overview

The RUKO LOS-HSSCo-89mm is a fully ground HSS cobalt twist drill bit engineered for industrial drilling. Its bright, uncoated surface and h8 tolerance ensure consistent hole quality in high-alloy steels, stainless steel, cast iron, bronze, acid-resistant steels, and heat-resistant steels.

What stands out

• 5% cobalt alloy (HSSCo5) for high heat and wear resistance
• 135° split point eliminates walking and reduces drilling force
• DIN 338 standard geometry with right-hand spiral flutes
• Cylindrical shank fits standard drill chucks
• Fully ground for precise diameter and concentricity

Technical details

• Diameter: 8.9 mm
• Working length: 89 mm
• Total length: 125 mm
• Material: High-speed steel with 5% cobalt (HSSCo5)
• Point angle: 135°
• Point type: Split point (self-centering)
• Shank type: Cylindrical
• Flute type: Right-hand spiral
• Surface finish: Bright (uncoated)
• Manufacturing process: Fully ground
• Tolerance class: h8
• Standard: DIN 338

Our verdict

A robust cobalt drill bit for professionals who need reliable performance in tough materials. The split point and precise grinding make it a solid addition to any metalworking toolkit.