Chicago-Latrobe
Chicago-Latrobe 11171 135 Degree NAS-Type Aircraft Extension Drill #47 28 Degrees High Speed Steel Black Oxide
A #47 aircraft extension drill with a 135-degree split point made from high-speed steel with black oxide coating
- 135° split point reduces walking for accurate starts
- #47 wire-gauge size drills precise small-diameter holes
- High-speed steel with black oxide resists wear during extended use
- 28° helix angle clears chips efficiently in deep cuts
- 11171 NAS-type design meets aircraft extension drilling requirements
Chicago-Latrobe 11171 Aircraft Extension Drill
The Chicago-Latrobe 11171 is a NAS-type aircraft extension drill designed for precision drilling in aerospace and industrial applications. It suits machinists and maintenance technicians who require extended reach for deep or hard-to-access holes.
135-Degree Split Point with Black Oxide
The 135-degree split point reduces thrust and prevents walking, improving accuracy on contact. High-speed steel construction with black oxide finish enhances wear resistance and chip flow during deep-hole drilling operations.
Straightforward Chuck Installation
The drill installs directly into a standard chuck without adapters. The 4xD length and one-inch maximum drilling depth require steady feed pressure to avoid deflection or breakage in harder materials.
Highlights
- 135° split point reduces walking for accurate starts
- #47 wire-gauge size drills precise small-diameter holes
- High-speed steel with black oxide resists wear during extended use
- 28° helix angle clears chips efficiently in deep cuts
- 11171 NAS-type design meets aircraft extension drilling requirements
Specifications
| Brand | CHICAGO-LATROBE |
|---|
Questions about this item
When will the #47 high-speed steel bit need replacement?
Replace the bit once the split point dulls enough that it no longer self-centres or requires excessive feed pressure.
What limits continuous drilling depth in one pass?
The flute length allows a maximum drilling depth of 1 inch before chips must be cleared.
How hot does the black-oxide finish get during all-day use?
The coating reduces friction, but sustained drilling will still heat the bit; allow cooling intervals to preserve temper.
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