Chicago-Latrobe
Chicago-Latrobe 11112 135° NAS Aircraft Extension Drill 5/16
135-degree split-point high-speed steel aircraft extension drill with black oxide finish for deep-hole drilling
- 135° split point reduces walking on hard metals
- 5/16 inch high-speed steel handles demanding drilling tasks
- 28° helix angle clears chips efficiently from deep holes
- 3 3/16 inch depth capacity reaches confined aircraft structures
- Black oxide finish resists corrosion during extended use
Chicago-Latrobe 11112 Aircraft Extension Drill
The Chicago-Latrobe 11112 is a NAS-type aircraft extension drill built for deep-hole drilling in aviation maintenance and manufacturing. Its 5/16 inch fractional size and extended reach suit professional mechanics and technicians working on airframe structures.
Sustained drilling performance
The 135-degree split point centres the bit quickly and reduces thrust, lowering heat buildup during continuous operation. High-speed steel with a black oxide finish resists wear when drilling through tough alloys at the 28-degree helix angle over the full 3 3/16 inch depth.
Practical limits of the 4xD standard
The 4xD length-to-diameter ratio defines the maximum stable drilling depth at 3 3/16 inches before deflection becomes excessive. Chip evacuation grows difficult beyond this limit, so the bit is not intended for deeper holes or rigid CNC-only tooling.
Highlights
- 135° split point reduces walking on hard metals
- 5/16 inch high-speed steel handles demanding drilling tasks
- 28° helix angle clears chips efficiently from deep holes
- 3 3/16 inch depth capacity reaches confined aircraft structures
- Black oxide finish resists corrosion during extended use
Specifications
| Brand | CHICAGO-LATROBE |
|---|
Questions about this item
Will the 135-degree split point on the 11112 drill bit reduce heat buildup during extended drilling sessions?
The 135-degree split point is designed for self-centering and faster penetration, which helps reduce thrust force and heat generation when drilling deep holes in tough materials.
Do I need a specific chuck size or drill press to use the 5/16-inch shank on this aircraft extension drill?
You need a drill chuck that accommodates a 5/16-inch shank diameter; the extended length requires a stable drill press or rigid handheld drill to prevent wobble.
Can the 11112 high-speed steel bit with black oxide finish effectively drill the older rivet holes in my restoration project?
Yes, the high-speed steel construction and black oxide finish provide the wear resistance needed for drilling into existing rivet holes and hardened materials.
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