Drill America
Drill America #40 Cobalt Aircraft Extension Drill Bit 12in
A 12-inch cobalt aircraft extension drill bit in size 40 with a heavy-duty split point for precision drilling
- TypeDrill Accessories
- #40 wire-gauge hole size drills .0980 in
- 12 in overall length reaches deep cavities
- Cobalt steel resists heat in tough alloys
- Split point starts on contact without wandering
Drill America #40 Cobalt Extension Bit
The Drill America #40 cobalt aircraft extension drill bit measures 12 inches overall with a 1-3/8 inch flute length. Its heavy-duty split point design reduces walking and starts holes cleanly in tough materials. Cobalt steel construction provides high heat resistance and extended tool life for demanding drilling tasks. This bit suits precision work requiring long reach and durability.
Ideal for deep-hole drilling in hard metals
Aircraft maintenance technicians and metal fabricators benefit from the extended length and cobalt hardness when drilling deep, accurate holes in stainless steel or titanium. The #40 wire gauge size matches specific fastener clearance requirements. Buyers needing larger diameters or shorter jobber-length bits should consider other options. Users without a 12-inch chuck capacity cannot use this bit effectively.
Highlights
- #40 wire-gauge hole size drills .0980 in
- 12 in overall length reaches deep cavities
- Cobalt steel resists heat in tough alloys
- Split point starts on contact without wandering
Specifications
| Brand | Drill America |
|---|---|
| Type | Drill Accessories |
Questions about this item
What chuck capacity do I need to hold this #40 drill bit?
The bit has a decimal equivalent of .0980 inch, so a chuck that closes to at least that diameter is required.
Will the 12-inch overall length reach through the workpiece on my existing drill press?
The bit measures 12 inches overall with a 1-3/8 inch flute length, giving extra reach for deep or awkward holes.
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