Chicago-Latrobe
Chicago-Latrobe 40568 135° NAS aircraft extension drill 5/32 in 28° split point HSS black oxide
Aircraft extension drill with 135° split point in high-speed steel for deep-hole precision
- TypeDrill Bits
- MaterialHAWA
- 135° split point starts holes without walking
- 5/32 in HSS bit drills 5/8 in deep in aircraft alloys
- 28° helix clears chips faster in deep holes
- Black oxide finish resists corrosion and reduces friction
- NAS-type geometry meets aircraft manufacturing standards
135° NAS Aircraft Extension Drill
The Chicago-Latrobe 40568 is a high-speed steel drill bit with a 135-degree split point and black oxide finish. It is built for deep-hole drilling in aerospace and precision metalworking applications. The 28-degree helix angle supports chip evacuation in extended reach tasks. This tool suits professionals needing accurate hole placement in tough alloys.
Suited for deep-hole precision work
Machinists and maintenance technicians drilling deep, accurate holes in high-performance alloys will benefit from the split-point geometry and extended length. The design reduces walk and improves centering on curved or angled surfaces. Buyers needing standard jobber-length bits or carbide-tipped tooling for abrasive composites should consider other options. This bit is optimised for specific NAS-type requirements.
5/32 inch fractional size decides fit
The 5/32 inch diameter determines compatibility with fastener callouts and fixture bushings in aircraft assembly. The 4xD maximum drilling depth of 5/8 inch sets the practical limit for through-hole or blind-hole operations. Verify the exact fractional size and depth requirement against your engineering drawing before purchase. No other dimension in the data overrides this specification.
Highlights
- 135° split point starts holes without walking
- 5/32 in HSS bit drills 5/8 in deep in aircraft alloys
- 28° helix clears chips faster in deep holes
- Black oxide finish resists corrosion and reduces friction
- NAS-type geometry meets aircraft manufacturing standards
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
Questions about this item
How much heat does the 135° split point generate when drilling all day?
The 135° split point with 28° helix reduces thrust and heat buildup during extended drilling sessions.
What chuck size do I need for the 5/32 in shank?
A 5/32 in or larger drill chuck is required to hold the fractional-inch shank securely.
Will the 135° point angle work with my older drill press?
Yes, the 135° split point is compatible with standard drill presses and handheld drills.
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