Chicago-Latrobe
Chicago-Latrobe 11029 135 Degree NAS-Type Aircraft Extension Drill 31/64 in
135-degree split-point aircraft extension drill bit in high-speed steel with black oxide coating for 4-3/8 inch depth drilling in 31/64 inch size
- 135-degree split point starts holes cleanly without walking
- 31/64 inch fractional size fits precise aircraft fastener specs
- High-speed steel with black oxide resists wear in tough alloys
- 4-3/8 inch flute depth reaches deep through structural members
- NAS-type geometry meets aerospace drilling standards
Chicago-Latrobe 11029 Aircraft Extension Drill
The Chicago-Latrobe 11029 is a NAS-type aircraft extension drill built for precision drilling in aerospace and maintenance applications. Its 135-degree split point ensures accurate starts on metal surfaces without walking. The high-speed steel construction with black oxide finish resists wear during repetitive use. It suits mechanics and technicians who need reliable deep-hole access in confined spaces.
135-degree split point and black oxide finish
The 135-degree split point reduces thrust required and centres the bit instantly on hard materials. Black oxide coating adds lubricity and corrosion resistance for longer cutting life. High-speed steel grade supports high-performance machining across 28 degrees of helix angle. These features combine to deliver consistent chip evacuation and hole quality at extended reach.
High-speed steel build with fractional sizing
The drill measures 31/64 inch in diameter and achieves a maximum drilling depth of 4 3/8 inches at a 4xD ratio. Its straight shank fits standard drill chucks and aircraft extension holders securely. The robust high-speed steel body withstands the torque and heat of deep-hole drilling. This tool is not for buyers needing larger diameters or non-fractional metric sizes.
Highlights
- 135-degree split point starts holes cleanly without walking
- 31/64 inch fractional size fits precise aircraft fastener specs
- High-speed steel with black oxide resists wear in tough alloys
- 4-3/8 inch flute depth reaches deep through structural members
- NAS-type geometry meets aerospace drilling standards
Specifications
| Brand | CHICAGO-LATROBE |
|---|
Questions about this item
How often will the 135-degree split point on the 31/64-inch bit need resharpening?
Resharpen when the split point dulls; the 135-degree geometry and high-speed steel construction extend edge life under normal drilling conditions.
What stops a continuous drilling session with this 4-3/8-inch flute length?
The 4 3/8-inch maximum drilling depth and chip clearance in the flutes limit each plunge before the bit must be withdrawn.
How hot does the black-oxide high-speed steel get during all-day drilling?
High-speed steel with black oxide coating resists heat buildup; use cutting fluid and periodic withdrawal to manage temperature during extended use.
Also in this aisle
People compared these
Same shelf, same checkout — eight coins and a 30-minute rate lock.
