Chicago-Latrobe
Chicago-Latrobe 11157 #33 135° Aircraft Extension Drill
Aircraft extension drill bit size #33 with 135-degree split point in high-speed steel for deep precision drilling
- 135° split point starts cleanly on curved surfaces
- High-speed steel with black oxide resists wear
- #33 wire gauge drills precise pilot holes
- 1 1/2 in depth capacity handles extended reach
- 28° helix clears chips efficiently in deep cuts
Aircraft Extension Drill #33 135° Split Point
This Chicago-Latrobe 11157 drill bit is a high-speed steel aircraft extension drill with a 135-degree split point. It features a black oxide finish and is graded for high-performance machining. The bit has a 28-degree helix angle and a maximum drilling depth of 1 1/2 inches.
Precision Drilling For Thin Materials
The split point geometry reduces walking and is suited for drilling wire-sized holes in sheet metal and composite structures. Buyers needing larger diameter holes or standard jobber-length bits for general woodworking should consider other tool types.
135-Degree Split Point Geometry
This point angle determines how the drill engages the workpiece and manages chip formation in hard materials. It is the critical specification for matching the drill to NAS-type aircraft fastening requirements.
Highlights
- 135° split point starts cleanly on curved surfaces
- High-speed steel with black oxide resists wear
- #33 wire gauge drills precise pilot holes
- 1 1/2 in depth capacity handles extended reach
- 28° helix clears chips efficiently in deep cuts
Specifications
| Brand | CHICAGO-LATROBE |
|---|
Questions about this item
How do I install the #33 drill bit into my drill chuck and what step is often missed?
Insert the straight shank fully into the chuck jaws and tighten securely; the step often missed is verifying the bit runs true before drilling.
What maintenance or replacement will the 135° split-point HSS bit with black oxide coating need later?
Resharpen the split point when cutting edges dull; replace the bit if the black oxide wears through or the flute chips.
What limit appears first during sustained drilling with the 1-1/2 inch maximum depth and 4xD design?
Chip evacuation becomes the limiting factor once the flute fills at depths approaching 1-1/2 inches.
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