Drill America
Drill America 59/64in Cobalt Heavy Duty Stub Drill Bit pneumatic accessory
Cobalt stub drill bit in 59/64 inch size with 135-degree split point for self-centering drilling in iron and steel
- TypeDrill Accessories
- Cobalt construction withstands heat in tough alloys
- 135-degree split point centres itself without a pilot hole
- Manufactured to Aerospace Standard 907 for consistent quality
- Short stub length fits tight spindle clearances
- 118-degree point on sizes above 1/2in handles larger holes
59/64in Cobalt Stub Drill Bit
This 59/64in cobalt stub drill bit meets Aerospace Standard 907 for heavy-duty use. The short, rugged construction suits portable or machine drilling in iron and steel families. It is built for automotive and construction tasks where spindle clearance is limited.
135-degree split point upgrade
The 135-degree split point is self-centering and reduces thrust compared with the 118-degree standard point found on sizes outside the 1/16in to 1/2in range. The jump is worth it when drilling harder materials or when a shorter drill length improves rigidity and hole accuracy.
Fits tight-spindle setups
The stub length frees up spindle clearance in screw-machine setups and compact drill presses. It needs a chuck that accepts a 59/64in shank and works best with rigid, low-runout holders. Buyers who need deeper holes or larger diameters should look for longer series bits.
Highlights
- Cobalt construction withstands heat in tough alloys
- 135-degree split point centres itself without a pilot hole
- Manufactured to Aerospace Standard 907 for consistent quality
- Short stub length fits tight spindle clearances
- 118-degree point on sizes above 1/2in handles larger holes
Specifications
| Brand | Drill America |
|---|---|
| Type | Drill Accessories |
Questions about this item
What size chuck does the 59/64 inch drill bit require?
The bit has a 59/64 inch diameter, so it needs a chuck that opens to at least that size.
How do I start the hole correctly with the 135 degree split point?
Apply steady pressure on centre; the self-centering split point prevents wandering without a centre punch.
When should I replace this cobalt stub drill bit?
Replace it when the cutting edges dull or chip, as the 135 degree point can no longer self-centre effectively.
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