RUKO KEB-HSS-TiAlN Twist Drill Bit 28.0 mm DIN 338

This RUKO twist drill bit stands out for its cobalt-enriched HSS-E-Co 8% core and TiAlN coating, a combination that keeps the cutting edge stable even when temperatures climb toward 800°C. In high-volume drilling of alloyed steels, stainless steel, or cast iron, that thermal headroom translates into longer tool life and fewer bit changes.

Highlights

• Diameter: 28.0 mm with h8 tolerance for precise hole sizing
• TiAlN coating with hardness of approximately 3000 HV
• Split point grind reduces walking and improves centering
• DIN 338 geometry with 135° point angle
• Ground from solid HSS-E-Co 8% for consistent flute quality

In daily use

The 178 mm flute length clears chips efficiently in deep holes, while the cylindrical shank fits standard drill chucks and collets. External coolant supply is recommended for best results in machining centers and industrial drilling stations.

Full specifications

• Tool type: Twist drill bit
• Material: HSS-E-Co 8% (high-speed steel with 8% cobalt)
• Coating: TiAlN (titanium aluminum nitride)
• Diameter: 28.0 mm
• Shank diameter: 28.0 mm
• Overall length (l1): 287 mm
• Flute length (l2): 178 mm
• Shank type: Cylindrical
• Point angle: 135°
• Point grind: Split point (cross-ground)
• Tolerance: h8
• Cutting direction: Right-hand cutting
• Number of flutes: 2
• Standard: DIN 338
• Application materials: Alloyed and unalloyed steels, stainless steel, cast iron, non-ferrous metals
• Manufacturing process: Ground from solid
• Heat resistance (coating): Up to 800°C
• Hardness (coating): Approx. 3000 HV
• Coolant supply: External
• Recommended use: Industrial drilling, machining centers

Final note

For operators who need a large-diameter drill that holds its edge in tough materials, the KEB-HSS-TiAlN delivers the geometry and coating to match the job.