Drill America
Drill America Cobalt Aircraft Extension Drill Bit #3 12in 2130
Cobalt aircraft extension drill bit with a heavy-duty split point, 12 inches long and .2130 decimal equivalent
- TypeDrill Accessories
- Cobalt steel resists heat during extended drilling
- 12-inch reach accesses deep or confined work areas
- Split point design starts on contact without wandering
- Decimal size .2130 matches #3 specifications precisely
Drill America #3 Cobalt Extension Bit
The Drill America #3 cobalt aircraft extension drill bit is built for deep-hole drilling in tough alloys and stainless steel. Its 12-inch overall length reaches areas that standard bits cannot, while the heavy-duty split point reduces walking and starts cleanly on hard surfaces. Cobalt steel construction resists heat and wear during extended use.
Upgrading from standard jobber-length bits
This bit replaces shorter high-speed steel drills when extra reach is required in aircraft maintenance or structural fabrication. The jump is worth it when hole depth exceeds the flute length of a conventional bit or when material hardness causes rapid dulling of non-cobalt tools. It is not suited for handheld drilling in thin sheet metal where a shorter, more rigid bit provides better control.
Highlights
- Cobalt steel resists heat during extended drilling
- 12-inch reach accesses deep or confined work areas
- Split point design starts on contact without wandering
- Decimal size .2130 matches #3 specifications precisely
Specifications
| Brand | Drill America |
|---|---|
| Type | Drill Accessories |
Questions about this item
What chuck diameter is needed for the .2130 inch shank?
A standard 1/4 inch or larger drill chuck will accept the .2130 inch shank on this 12 inch cobalt aircraft extension bit.
How do you prevent the bit from wandering when starting a hole in metal?
The heavy-duty split point is self-centering; apply firm, steady pressure at low RPM to engage the point before increasing speed.
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