BAC #: DB1-4C-12
Cobalt Drill Bits, 12"
Description
12" High Speed Steel Aircraft Extension Drills feature a 135 degree split point, manufactured to NAS Standard 907.
Sizes: 1/4, 10, 19, 21, 30, 40.
| Category | Specification |
|---|---|
| Product Type | Cobalt 12" Long Drill Bits |
| Material | M35 or M42 cobalt high-speed steel (varies by manufacturer and size) designed for extended tool life and high-heat applications. |
| Length Style | 12" long twist drill providing an excellent balance of reach and rigidity for general-purpose drilling. |
| Point Angle | 135° split point for fast starts, reduced walking, and lower drilling thrust. |
| Shank Type | Straight shank |
| Flute Design | Spiral flutes for efficient chip evacuation during drilling. |
| Cutting Direction | Right-hand cutting. |
| Best Materials | Stainless steel, alloy steel, hardened steel, cast iron, titanium, Inconel®, nickel alloys, and other difficult-to-machine metals. |
| Applications | Aircraft maintenance, MRO operations, sheet metal fabrication, precision machining, structural repairs, manufacturing, and general industrial drilling. |
| Heat Resistance | Cobalt alloy construction maintains hardness at elevated temperatures for longer tool life than standard high-speed steel. |
| Available Sizes | Multiple fractional, letter, number, and metric sizes available (varies by part number). |
| Reusable | Yes, when properly sharpened and used with appropriate cutting speeds and lubrication. |
Features
Cobalt drill bits maintain hardness at elevated temperatures
Reduce edge breakdown and extend tool life
Well suited for precision hole drilling in skins, brackets, doublers, and structural repairs
Produce clean, accurately sized holes for rivets, bolts, and Hi-Lok fasteners
Dependable choice in both line maintenance and heavy maintenance environments
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