RUKO LOS-HSSCo-37mm Cobalt Twist Drill Bit 3.7mm DIN 338

Drilling into tough materials like stainless steel or hardened alloys often causes standard bits to overheat and dull quickly. The RUKO LOS-HSSCo-37mm solves this with a cobalt-alloyed high-speed steel construction that resists heat and wear, keeping your drilling accurate and efficient even under demanding conditions.

Who is it for

This twist drill bit is built for professionals and serious DIYers who work with alloyed and non-alloyed steel, stainless steel, cast iron, non-ferrous metals, and plastics. Its high heat resistance makes it suitable for continuous use in workshops, metal fabrication, and maintenance tasks.

Main features

• 5% cobalt HSS-Co material for superior hardness and heat resistance
• 135° split point for self-centering and reduced walking
• Fully ground flutes for precise hole quality and efficient chip removal
• DIN 338 standard dimensions: 70 mm total length, 43 mm flute length
• Cylindrical shank fits standard drill chucks
• Bright finish for low friction and corrosion resistance

Specifications

• Material: HSS-Co (High-Speed Steel with Cobalt)
• Drill bit type: Twist drill bit
• Diameter: 3.7 mm
• Total length: 70 mm
• Working length (flute length): 43 mm
• Shank type: Cylindrical
• Point angle: 135°
• Point type: Split point
• Cutting direction: Right-hand cut
• Tolerance: h8
• Manufacturing process: Fully ground
• Recommended materials: Alloyed and non-alloyed steel, stainless steel, cast iron, non-ferrous metals, plastics
• Tensile strength compatibility: Up to 1000 N/mm²
• Suitable for: Corded and cordless drills, pillar drills

Tips

Use a cutting fluid or lubricant when drilling stainless steel to extend bit life and improve finish. For best results, start at a lower speed and increase as needed while maintaining steady pressure.