Solid Carbide step Twist Drill Bit

• Material: tungsten carbide
• Size: 5.5mm*8.0mm+8mm*80mm
• Super sharpness and wear resistance.
• Used for stainless steel, cast iron, mould steel, carbon steel etc.

Technical Data

• Material: Ultra-fine grain tungsten carbide (0.2 – 0.4μm grain size), applicable for workpieces up to HRC 52.
• Key Dimensions: Drill diameter 0.1 – 20mm, 2 flutes, 30° helix angle, 118°/135° tip angle; shank diameter 4 – 20mm, total length 66 – 153mm.
• Coatings & Precision: TiAlN/DLC coatings; shank diameter tolerance 0/-0.005mm, drill diameter tolerance up to M7 grade.
• Cutting Params: Cutting speed 140 – 240m/min; feed rate 0.06 – 0.43mm/r, with through coolant support.

Advantages

• Drills stepped holes and chamfers in one pass, slashing cycle time.
• Ultra-fine carbide and special coatings boost wear resistance and tool life.
• Large grooves and polished surface enable smooth chip evacuation, reducing tool wear.
• Rigid structure and precise grinding reduce vibration, ensuring stable drilling accuracy.