Chicago-Latrobe
Chicago-Latrobe 11149 #25 135° Aircraft Extension Drill
Aircraft extension drill bit sized #25 with a 135-degree split point for self-centering starts in tough materials
- 135° split point starts cleanly without wandering
- #25 wire-gauge drill cuts precise small holes
- 1 7/8 in flute length reaches deep work
- High-speed steel with black oxide resists wear
- 28° helix angle clears chips efficiently
Chicago-Latrobe 11149 #25 Aircraft Drill
The Chicago-Latrobe 11149 is a #25 size aircraft extension drill built from high-speed steel with a black oxide finish. It is designed for precision drilling in aerospace and machining applications where accuracy and tool life are critical.
135° Split Point with 28° Helix
The 135-degree split point allows for self-centering starts without a centre punch, reducing walk on hard materials. A 28-degree helix angle supports efficient chip evacuation during deep-hole work, while the black oxide surface resists corrosion and improves lubricity.
4xD Reach for Extended Access
This drill provides a maximum drilling depth of 1 7/8 inches at a 4x diameter ratio, letting operators reach through structural members or deep cavities. The extended length reduces the need for separate extension tools in maintenance and assembly tasks.
Highlights
- 135° split point starts cleanly without wandering
- #25 wire-gauge drill cuts precise small holes
- 1 7/8 in flute length reaches deep work
- High-speed steel with black oxide resists wear
- 28° helix angle clears chips efficiently
Specifications
| Brand | CHICAGO-LATROBE |
|---|
Questions about this item
What drill-point standard does the 135° split point follow, and what material hardness does it target?
The 135-degree split-point geometry follows NAS-type aircraft specifications and is designed for high-performance machining grades.
What overall length and shank configuration does the #25 wire-gauge bit need to clear a deep-hole fixture?
The bit provides a 1 7/8-inch maximum drilling depth with a straight shank matching the #25 wire-gauge flute diameter.
Which drilling sequence prevents the split point from walking on the 28-degree helix?
Start at low RPM with light feed pressure to engage the split point, then increase speed while maintaining steady axial force.
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