Built for demanding aerospace, maintenance, and precision metal drilling applications, these M42 cobalt threaded shank aircraft adapter drill bits deliver exceptional heat resistance, durability, and reliable performance in stainless steel and other hard metals. Designed for compatibility with threaded drill systems, they combine secure tool retention with fast, accurate starts for professional drilling applications where precision matters. Features a 1/4-28 threaded shank for compatibility with Type D adapter style aircraft drill systems.

• Manufactured to NAS 965 Type D specifications for compatibility with threaded adapter-style aircraft drilling systems.
• Made from premium M42 cobalt high speed steel for superior heat resistance and extended tool life in tough metal drilling applications
• 1/4"-28 threaded shank design provides a secure, positive connection in compatible drill systems for improved control and reduced slippage.
  
• 135° split point tip starts quickly with reduced walking for cleaner, more accurate hole placement.
  
• Engineered for aerospace, aviation maintenance, fabrication, and industrial metalworking applications requiring dependable precision
• Performs exceptionally well in stainless steel, hardened steel, cast iron, and other difficult-to-machine metals.
  
• Manufactured to NAS 965 Type "D" specifications
• When drilling low tensile strength materials, the Type "D" cobalt drill will have a significantly greater tool life than the NAS 965 Type B high speed steel adapter drills resulting in a much lower cost per hole.