Drill America
Drill America 31/64in x 12in Cobalt Aircraft Extension Drill Bit pneumatic accessory
A 31/64 inch cobalt aircraft extension drill bit with a 12 inch overall length and heavy-duty split point for deep-hole drilling
- TypeDrill Accessories
- Cobalt steel resists heat during deep drilling
- 12 inch reach accesses confined fastener locations
- Heavy-duty split point reduces walking on hard surfaces
- 31/64 inch diameter matches precise aerospace specifications
Drill America 31/64in Cobalt Extension Bit
This cobalt steel drill bit is built for deep-hole drilling in tough alloys such as stainless steel and titanium. Its 12 inch overall length reaches confined areas that standard jobber bits cannot access. The heavy-duty split point reduces walking and starts cuts cleanly without a centre punch.
Replaces shorter bits for deep aerospace work
Upgrade from a standard-length bit when the workpiece thickness or fixture clearance exceeds the reach of a 4-3/8 inch flute. The jump is worth it for maintenance tasks on airframe structures where the extra length prevents the need for custom tooling or disassembly. Buyers who need a smaller diameter or a shorter flute for general shop use should select a different size.
Highlights
- Cobalt steel resists heat during deep drilling
- 12 inch reach accesses confined fastener locations
- Heavy-duty split point reduces walking on hard surfaces
- 31/64 inch diameter matches precise aerospace specifications
Specifications
| Brand | Drill America |
|---|---|
| Type | Drill Accessories |
Questions about this item
What chuck size is needed to hold the 31/64in shank?
A chuck that opens to at least 31/64in (0.4844in) is required to grip the bit securely.
How do you start the hole so the 12in cobalt bit does not wander?
Use a centre punch and begin drilling at low speed with steady pressure; the split point helps but the long flute will flex if you push sideways.
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