RUKO Stub Drill Bit DIN 1897 HSS Co 5, Ø 8.0 mm

In a busy metalworking shop, a machinist reaches for this RUKO stub drill bit to start a precise hole in a steel bracket. The short, rigid flute design resists deflection, making it ideal for drilling accurate holes in tight spaces or on uneven surfaces.

Key specifications

• Drill bit type: Stub drill bit
• Standard: DIN 1897
• Material: HSS Co 5 (high-speed steel with 5% cobalt)
• Diameter: 8.0 mm
• Overall length: 79 mm
• Flute length: 43 mm
• Shank type: Cylindrical (parallel shank)
• Shank diameter: 8.0 mm
• Point angle: 130°
• Point grind: Split point (cross-ground point)
• Surface finish: Bright (uncoated)
• Manufacturing process: Fully ground
• Cutting direction: Right-hand cutting
• Tolerance: h8
• Recommended material hardness: Up to 1100 N/mm²
• Suitable materials: Alloyed and unalloyed steel, cast steel, grey cast iron, malleable cast iron, sintered iron, nickel silver, graphite, non-ferrous metals, plastics
• Heat resistance: High
• Self-centering: Yes
• Chip removal: Excellent
• Packaging quantity: 1

Why choose it

The 5% cobalt alloy withstands high temperatures, extending tool life when drilling tough materials. The split point reduces walking and eliminates the need for center punching, while the short flute length provides exceptional rigidity for accurate hole placement.

Ideal use cases

• Drilling pilot holes or through holes in steel and cast iron
• Working in confined spaces where a standard jobber length drill is too long
• Applications requiring high positional accuracy, such as jig and fixture work

Good to know

This drill bit is fully ground from solid HSS Co 5, ensuring consistent geometry and sharp cutting edges. It is suitable for use with stationary drilling machines and hand drills with adequate power.