RUKO SPB-DIN345 41.0mm HSS-E-Co 5 Morse Taper Drill Bit MK4

For industrial machinists and metalworking shops drilling large-diameter holes in tough steels, the RUKO SPB-DIN345 41.0mm HSS-E-Co 5 twist drill bit delivers reliable performance. With a 41.0 mm diameter, Morse taper shank size MK4, and cobalt-enriched high-speed steel, it is built for demanding workshop applications.

Key specifications

• Drill diameter: 41.0 mm
• Standard: DIN 345
• Material: HSS-E-Co 5 (5% cobalt high-speed steel)
• Shank type: Morse taper, size MK4
• Total length: 385 mm
• Cutting length: 220 mm
• Point angle: 130°
• Point grind: Split point (DIN 1412 C)
• Tolerance: h8
• Cutting direction: Right-hand
• Surface treatment: Bright finish
• Manufacturing method: Ground from solid

Why choose it

The 5% cobalt alloy enhances heat resistance and wear life, allowing higher cutting speeds and longer tool life in alloyed and unalloyed steels, cast iron, non-ferrous metals, and plastics. The split point reduces thrust and improves centring accuracy.

Ideal use cases

• Drilling large holes in structural steel and machine frames
• Maintenance and repair in heavy industry
• Production drilling in manufacturing cells
• Use on machines with Morse taper spindles

Good to know

This drill bit is ground from solid for consistent geometry and precision. The bright finish provides a clean surface and corrosion resistance during storage.