Chicago-Latrobe
Chicago-Latrobe pneumatic accessory
Aircraft extension drill bit with 135-degree split point and 28-degree helix for high-performance machining
- TypeDrill Bits
- MaterialHAWA
- 135° split point starts cleanly on hard metals
- HAWA high-speed steel holds edge through deep cuts
- 28° helix clears chips from tight bores
- 4×D reach drills 1/2" depth in one pass
- Black oxide finish resists wear and corrosion
Aircraft Extension Drill 135°
The Chicago-Latrobe 40566 is a NAS-type aircraft extension drill designed for precision drilling in aviation maintenance and manufacturing. Its split-point geometry reduces walking and ensures accurate hole placement in demanding materials.
Check shank compatibility and reach
Verify that your drill chuck or collet accepts the straight shank of this extension bit. Confirm the 4xD length provides sufficient reach for the specific fastener holes or structural features you need to access.
High-speed steel with black oxide
The high-speed steel construction and black oxide finish resist wear and heat during repetitive drilling cycles. The 135-degree point angle and 28-degree helix promote efficient chip evacuation and consistent cutting performance in tough alloys.
Highlights
- 135° split point starts cleanly on hard metals
- HAWA high-speed steel holds edge through deep cuts
- 28° helix clears chips from tight bores
- 4×D reach drills 1/2" depth in one pass
- Black oxide finish resists wear and corrosion
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
Questions about this item
What comes with the Chicago-Latrobe 40566 drill bit and is anything else needed to use it?
The package contains the 135-degree split-point drill bit itself; a compatible drill motor or pneumatic driver must be supplied separately.
How do I choose between the available versions of the 40566 aircraft extension drill?
The 40566 is offered as a single 1/8-inch fractional-inch size with a 135-degree point and black-oxide finish, so no capacity or version selection is required.
What does the 135-degree point angle mean when the bit is running in a real drill?
The 135-degree split point centres the bit on contact, reduces walking and lowers thrust force for cleaner holes in high-performance machining-grade material.
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