RUKO SPB-DIN338-6.3mm HSSCo Twist Drill Bit

Precision drilling in tough metals demands a bit that stays sharp and centered. The RUKO SPB-DIN338-6.3mm HSSCo twist drill bit is built for workshops and production lines where alloyed steel, stainless steel, and cast iron are everyday materials. Its 5% cobalt high-speed steel construction withstands high temperatures, while the 135° split point starts on contact without walking.

Key specifications

• Diameter: 6.3 mm
• Total length: 101 mm
• Working length: 63 mm
• Material: HSS-Co (5% cobalt)
• Point angle: 135°
• Point grind: Split point (self-centering)
• Shank: Cylindrical, 6.3 mm diameter
• Standard: DIN 338
• Cutting direction: Right-hand
• Tolerance: h8
• Surface finish: Bright
• Manufacturing process: Ground from solid

Why choose it

The cobalt alloy retains hardness at elevated temperatures, allowing higher cutting speeds and longer tool life compared to standard HSS. The split point eliminates the need for center punching and reduces thrust pressure, making it ideal for handheld drilling and CNC applications alike. Ground from solid, the bit offers consistent geometry and reliable chip evacuation.

Ideal use cases

• Drilling alloyed and unalloyed steel up to 1100 N/mm² tensile strength
• Stainless steel and heat-resistant alloys
• Cast iron and non-ferrous metals
• Plastics and composite materials

Good to know

Supplied as a single bit. For best results, use appropriate cutting fluid and reduce speed when drilling hard materials. The bright finish provides a clean surface and helps prevent chip adhesion.