Countersink Bits

RUKO Countersink Bits

RUKO countersinks are CBN (cubic crystalline boron nitride) ground from fully hardened, High-Speed Steel (HSS) blanks.

• CBN is a much harder abrasive than either silicon carbide or corundum and creates a sharper and more durable cutting edge with precise tolerances.
• Radially-adjusted relief grinding ensures that the cutting edge is always the highest point, and combined with axial relief grinding, guarantees a smooth, low-heat, chatter-free cut up to 30% faster than competing countersink bits.
• These tough bits are suitable for all standard industrial materials: steel, cast iron, stainless steel, non-ferrous metal, thermoplastics, and duroplastics.
• Best results are achieved at low cutting speeds. Use of cutting oil or paste will provide longer tool life and superior quality work.

Features

• High-speed steel for general purpose use
• Up to 30% faster chatter-free cutting
• 82° countersink diameters (8 bits): 1/4, 5/16, 3/8, 1/2, 5/8, 3/4, 7/8, 1 -inch
• 90° countersink diameters (5 bits): 10.4mm, 12.4mm, 16.5mm, 20.5mm, 25mm
• 5-piece 82° and 90° countersink sets available