English (World wide)
Customers in North America, please click here.

M18 thread type.
High-speed and high-precision drilling is possible with a minimal force.


  • M18 thread type.
  • Circumferential cutting, in which cutting area is very small, permits boring large holes with low-powered machines.
  • No need of pilot holes for positioning by using center pin. An inner spring provides easy removal of chips.


  • For drilling in steel, shape steel, stainless steel, and cast iron up to 35mm (MB350) or 50mm (MB500) in thickness.
  • Best for drilling work in shipbuilding, bridge building, framework building, and steel structure building.


Cutter size: MB500: o18mm to 80mm (Max. drilling depth: 50mm)
MB350: o14mm to 36mm (Max. drilling depth: 35mm)
Number of tips: Cutters of o14mm to 39mm --- 6pcs.
Cutters of o40mm to 64mm --- 8pcs.
Cutters of o65mm to 80mm --- 10pcs.
Tip width: Cutter of o 14mm --- 3.2mm
Cutter of o 14.5mm --- 3.4mm
Cutter of o 15mm --- 3.7mm
Cutters of o16mm to 80mm --- 3.9mm
Applicable electric drill: Magnetic drill presses, upright drilling machines, radial drilling machines, lathes, and milling machines.
Size A B
MB350 14mm to 25mm 67mm 13mm
MB350 25.5mm to 36mm 63mm 17mm
MB500 18mm to 25mm 82mm  
MB500 25.5mm or larger 78mm  

◆Click here for the guideline for cutting conditions of Metal borers.