RUKO Extra Short Twist Drill Bit DIN 1897 HSS-Co 5% Ø 4.1 mm

Machinists and metalworkers drilling high-alloy steels, stainless steels, or heat-resistant alloys will appreciate the RUKO extra short twist drill bit. With a 4.1 mm diameter and a robust HSS-Co 5% cobalt steel body, it delivers precise, self-centering holes in demanding materials.

Key specifications

• Material: HSS-Co (5% cobalt high-speed steel)
• Standard: DIN 1897
• Drill bit type: Extra short twist drill
• Diameter: 4.1 mm
• Total length: 49 mm
• Cutting length: 20 mm
• Shank type: Cylindrical (parallel)
• Point angle: 130°
• Point grind: Split point (cross-ground)
• Surface finish: Bright / polished
• Manufacturing process: Fully ground
• Direction of cut: Right-hand cutting
• Tolerance: h8
• Suitable materials: High-alloy steels, stainless steels, heat-resistant steels, cast iron, non-ferrous metals, plastics

Why choose it

The 5% cobalt alloy provides high heat and wear resistance, while the split point ensures accurate starting without a center punch. The extra short design offers maximum rigidity for clean, precise holes.

Ideal use cases

• Drilling stainless steel and high-alloy steel components
• Precision work in machine shops and toolmaking
• Applications requiring high accuracy and minimal run-out

Good to know

Fully ground flutes and a bright finish promote excellent chip removal and reduce friction. The h8 tolerance ensures consistent diameter for reliable performance.