All step drill bits have split points and come in two different materials. The spiral flutes of RUKO high-performance step drills are CBN-ground from the solid hardened form.
The split point reduces “walking” which is the tendency of a spinning bit to rotate away from the point at which you want to drill
Because CBN (cubical boron nitride) is a much harder abrasive than even silicon carbide or corundum, a better and sharper cutting edge is achieved without burrs.
Because of this higher dimensional precision, these industrial drill bits will last considerably longer while maintaining precise process tolerances.
Available in High Speed Steel (HSS) and Titanium Nitride-coated (Tin-coated) High Speed Steel,
The added titanium nitride coating increases the surface hardness to approximately 2300 HV and the heat resistance to 1100°F (600°C).
The High Speed Steel (HSS) allows the bit to cut faster than High Carbon Steel. At room temperature, HSS and high carbon steel have an equivalent hardness; at elevated temperatures HSS become advantageous
The Titanium Nitride (TiN) coating is an extremely hard ceramic. It is often used as a coating on HSS to improve hardness and durability
What makes these step drills special?
CBN-ground flutes without burrs mean a superior cutting edge and longer tool life
Each step has a radially adjusted relief produced by CBN grinding, relating directly to the diameter of the step, so the cutting edge is always the highest point of the diameter
Each step is axially CBN relief-ground, meaning the cutting edge is also the highest point of the axial cutting axis
The cutting edge of each step has relief angle, meaning the cutting edge is also the highest point in advance direction
The CBN-ground point ensures centering and spot-drilling, even in thin-walled material
Use High Speed Steel drill bits and HSS-TiN coated drill bits for:
Sheet metal working in electrical, sanitary engineering, heating technologies, automotive, mechanical engineering, switching systems and aviation
Non-ferrous metal, steel, stainless steel, thermoplastics, duroplastics, sheet metals up to 4mm, 0.16” (8 ga.) thick
Center, spot-drill, bore and debur - all in one operation