Drill America
Drill America 39/64 in Cobalt Heavy Duty Split Point Stub Drill Bit pneumatic accessory
A 39/64 inch cobalt stub drill bit with a 135 degree split point for self-centering, reduced thrust and broad material performance
- TypeDrill Accessories
- Self-centering 135° split point reduces thrust
- Aerospace Standard 907 manufacturing ensures precision
- Short rugged construction handles iron and steel
- Popular in automotive and construction industries
- Suited for limited spindle clearance setups
Cobalt Heavy Duty Split Point Stub Drill Bit
The Drill America cobalt stub drill bit is manufactured to Aerospace Standard 907 for professional use. Its short, rugged construction performs well in a broad range of iron and steel materials. The 135 degree split point is self-centering and reduces thrust during drilling. This design suits portable or machine drilling where spindle clearance is limited.
Aerospace Standard 907 manufacturing
Compliance with Aerospace Standard 907 ensures the bit meets rigorous dimensional and material requirements for demanding applications. The 135 degree split point eliminates the need for centre punching and lowers the feed pressure required. Short flute length increases rigidity and reduces breakage in confined setups. Sizes smaller than 1/16 inch and larger than 1/2 inch use a 118 degree standard point instead.
California Proposition 65 chemical warning
This product contains a chemical known to the State of California to cause cancer and birth defects or other reproductive harm. Verify that your chuck accommodates a 39/64 inch shank before ordering. Confirm the 135 degree point angle matches the material hardness and drilling method you intend to use. The stub length requires adequate workpiece clamping to prevent vibration.
Highlights
- Self-centering 135° split point reduces thrust
- Aerospace Standard 907 manufacturing ensures precision
- Short rugged construction handles iron and steel
- Popular in automotive and construction industries
- Suited for limited spindle clearance setups
Specifications
| Brand | Drill America |
|---|---|
| Type | Drill Accessories |
Questions about this item
When will the cobalt split-point tip need resharpening or replacement?
The 135° split point is self-centering and reduces thrust, extending edge life in iron and steel; resharpen when drilling force increases noticeably.
What limits continuous drilling in steel with this stub bit?
Short flute length restricts chip evacuation, so heat builds first; peck drilling clears chips and delays the limit.
How much heat does the bit generate during all-day machine drilling?
Cobalt alloy and the 135° geometry run cooler than standard 118° points, but sustained cuts still need cutting fluid to manage temperature.
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