Chicago-Latrobe
Chicago-Latrobe 11123 135° NAS Aircraft Extension Drill 31/64 in
Aircraft extension drill with a 135-degree split point, 31/64 inch size, high-speed steel construction and black oxide finish for deep-hole machining
- 135° split point starts drilling on contact without walking
- 31/64 in high-speed steel cuts clean holes in tough alloys
- 4-3/8 in flute length reaches deep cavities in airframe work
- Black oxide finish resists corrosion and reduces chip welding
- NAS-type geometry meets aerospace manufacturing standards
Chicago-Latrobe 11123 Aircraft Extension Drill
This Chicago-Latrobe 11123 aircraft extension drill is a 31/64 inch high-speed steel bit with a 135 degree split point and black oxide finish. It offers a maximum drilling depth of 4 3/8 inches and a 4xD ratio for deep-hole applications. The 28 degree helix supports chip evacuation in tough materials. Machinists and maintenance crews use it for precision drilling in aerospace and high-performance machining tasks.
Suited for deep-hole precision work not
This drill suits machinists and maintenance crews who need a 135 degree split point for accurate starts in high-performance alloys and a 4xD length for extended reach. The 31/64 inch fractional size fits specific aerospace fastener requirements. Buyers needing a standard jobber-length bit for general-purpose drilling or a shank design compatible with common drill chucks without an extended reach should look at other options.
31/64 inch 135 degree split point high-speed steel
The decisive specification is the 31/64 inch diameter combined with a 135 degree split point on high-speed steel with black oxide coating. This geometry reduces thrust and prevents walking on hard materials, while the 4xD length and 4 3/8 inch drilling depth reach deep features. If the application requires a different diameter, point angle, or shorter flute length, this drill will not match the requirement.
Highlights
- 135° split point starts drilling on contact without walking
- 31/64 in high-speed steel cuts clean holes in tough alloys
- 4-3/8 in flute length reaches deep cavities in airframe work
- Black oxide finish resists corrosion and reduces chip welding
- NAS-type geometry meets aerospace manufacturing standards
Specifications
| Brand | CHICAGO-LATROBE |
|---|
Questions about this item
How does the 135-degree split point behave when the drill enters the workpiece?
The 135-degree split point centres itself on contact and reduces thrust, so the bit starts cleanly without a centre punch.
What does the 28-degree helix angle mean for chip removal?
The 28-degree helix lifts chips efficiently in deep holes, helping prevent clogging at the 4-3/8-inch maximum drilling depth.
What shank style fits the 31/64-inch aircraft extension drill?
The drill has a straight shank the same diameter as the 31/64-inch cutting portion, so it mounts in a standard three-jaw chuck or collet.
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