Fractional Size Type D Cobalt Jobber Length Aircraft Drills
These fractional size type "D" drills made from heat resistant cobalt steel are heavy duty construction for drilling high temperature and high strength alloys. With just the flute length of a screw machine drill they are recommended for portable drilling. Furnished with a 135 degree split point to NAS specifications and treated with a bronze oxide for wear resistance and identification they are favored for tough drilling jobs.
- Manufactured to A.I.A. NAS-907 standards
- Heavy-duty construction provides greater strength and rigidity
- Designed for drilling tough and abrasive materials, high temperature alloys, stainless and heat-treated high-strength steels
- Similar to Type J, except screw machine length flutes are better suited for portable drilling
Furnished with a 135 degree split point to NAS specifications and treated with a bronze oxide for wear resistance and identification they are favored for tough drilling jobs. The short flute style is very rigid and stands up well in stainless steels, titanium and other high alloys.