RUKO SPB-DIN345 31.5mm HSS-E-Co5 Morse Taper Drill Bit MT4

Precision drilling in tough metals demands a bit that stays sharp and true. The RUKO SPB-DIN345 31.5mm HSS-E-Co5 Morse Taper Drill Bit is engineered for exactly that—a cobalt-alloyed high-speed steel twist drill with a 31.5 mm diameter, built for heavy-duty use in alloyed and unalloyed steels, cast iron, non-ferrous metals, and plastics.

Who is it for

Machinists, metalworkers, and maintenance professionals who need a reliable large-diameter drill bit for stationary drilling machines with an MT4 spindle. Its Morse taper shank ensures secure torque transmission and quick tool changes.

Main features

• 31.5 mm drill diameter with h8 tolerance for precise holes
• Morse taper shank MT4 for direct mounting in matching machine spindles
• HSS-E-Co5 cobalt alloy (5% Co) for high heat resistance and long life
• Ground from solid with bright finish and 118° point angle
• Right-hand cutting, standard spiral flute for efficient chip evacuation
• Conforms to DIN 345 for reliable performance

Specifications

• Material: HSS-E-Co5 (5% cobalt high-speed steel)
• Standard: DIN 345
• Drill diameter: 31.5 mm
• Shank type: Morse taper MT4
• Overall length: 340 mm
• Cutting length: 205 mm
• Point angle: 118°
• Surface finish: Bright
• Cutting direction: Right-hand
• Tolerance: h8
• Manufacturing process: Ground from solid
• Flute type: Standard spiral flute

Tips

Use a suitable cutting fluid to extend tool life when drilling steel. Ensure the Morse taper socket is clean before mounting to prevent runout. For deep holes, retract the bit periodically to clear chips.