RUKO SPB-DIN345-HSSCo-Ø27.5mm Morse Taper Drill Bit MK3

In a busy metalworking shop, the machinist reaches for this RUKO twist drill bit when a precise 27.5 mm hole is needed in a steel workpiece. The Morse taper shank seats securely in the tailstock of the lathe or the spindle of a drill press, providing a positive drive without slippage.

Key specifications

• Drill bit type: Twist drill bit
• Standard: DIN 345
• Material: HSS-Co (High-Speed Steel with Cobalt)
• Diameter: 27.5 mm
• Shank type: Morse Taper
• Morse Taper size: MK3
• Point angle: 130°
• Flute type: Standard spiral flute
• Surface finish: Bright
• Application materials: Steel, stainless steel, cast iron, non-ferrous metals, plastics
• Manufacturing process: Ground from solid
• Helix angle: Standard (approx. 25-30°)
• Cutting direction: Right-hand cut
• Tolerance: h8
• Number of flutes: 2
• Overall length: 290 mm
• Flute length: 165 mm
• Hardness: Approx. 64-67 HRC
• Packaging: Single unit

Why choose it

The cobalt alloyed high-speed steel retains hardness at elevated temperatures, allowing higher cutting speeds and longer tool life compared to standard HSS. The ground flutes and precise point geometry produce accurate holes with good surface finish.

Ideal use cases

• Drilling large diameter holes in steel and stainless steel in industrial environments
• Use on drill presses and lathes equipped with an MK3 Morse taper socket
• Maintenance and repair work where a robust, accurate drill bit is required

Good to know

Morse taper shank drill bits are intended for stationary machines; they are not suitable for hand-held drills. The bright finish provides corrosion resistance during storage, but the tool should be kept dry and lightly oiled when not in use.