Drill America
Drill America 29/64 in 12 in Cobalt Aircraft Extension Drill Bit
12-inch cobalt aircraft extension drill bit with 29/64-inch diameter and split point for heavy-duty drilling
- TypeDrill Accessories
- 29/64 inch diameter drills precise holes
- 12 inch overall length reaches deep cavities
- Cobalt steel construction resists heat and wear
- Split point tip starts accurately without wandering
Cobalt Aircraft Extension Bit
This Drill America cobalt steel drill bit measures 29/64 inch in diameter with a 12 inch overall length. The heavy duty split point design promotes accurate starting on metal surfaces. Its aircraft extension length reaches deep or awkward holes in automotive and industrial work.
Replaces shorter standard bits
Standard jobber length bits cannot reach the depths this 12 inch extension accesses. The cobalt steel construction withstands higher heat than high speed steel when drilling tough alloys. The jump is worth it for maintenance tasks where extra reach and heat resistance matter most.
Highlights
- 29/64 inch diameter drills precise holes
- 12 inch overall length reaches deep cavities
- Cobalt steel construction resists heat and wear
- Split point tip starts accurately without wandering
Specifications
| Brand | Drill America |
|---|---|
| Type | Drill Accessories |
Questions about this item
What chuck size is needed for the 29/64 in shank?
A 1/2 in or larger chuck is required because the 29/64 in shank equals .4531 in and exceeds the capacity of a standard 3/8 in chuck.
How do you avoid breaking the bit when drilling deep with the 12 in overall length?
Drill in short increments, clearing chips every 1 in to 2 in of depth; the 4-3/16 in flute length cannot evacuate chips from the full 12 in hole in one pass.
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