Chicago-Latrobe
Chicago-Latrobe 11146 #22 135-degree aircraft extension drill
A #22 aircraft extension drill with a 135-degree split point for high-performance machining
- 135-degree split point starts on contact without walking
- #22 wire-gauge drill bit fits tight aerospace fasteners
- 2-inch drilling depth reaches through stacked structures
- High-speed steel with black oxide resists wear in hard alloys
- 28-degree helix clears chips efficiently in deep holes
Aircraft Extension Drill #22
The Chicago-Latrobe 11146 is a NAS-type aircraft extension drill designed for precision drilling in aviation maintenance and manufacturing. Its extended reach suits deep-hole access in structural assemblies where standard bits cannot reach. Professional mechanics and aerospace technicians use it for accurate hole preparation in aluminium and alloy components. The 135-degree split point reduces walking on hard surfaces.
2-Inch Depth Capacity
This bit delivers a maximum drilling depth of 2 inches, providing sufficient reach for typical rivet-hole and fastener clearance tasks in airframe sections. The 4xD length-to-diameter ratio balances rigidity with access, minimising deflection during deep cuts. In thicker stack-ups or harder alloys beyond the rated depth, chip evacuation becomes difficult and hole accuracy degrades. Users needing greater reach must select a longer series.
High-Speed Steel Black Oxide Finish
The high-speed steel construction with black oxide coating resists wear and reduces galling when drilling aluminium and mild steel. The 28-degree helix angle promotes efficient chip removal in deep holes without binding. The split-point geometry starts on contact, eliminating the need for centre punching in most materials. No lubricants or specialised coatings are included; cutting fluid is recommended for sustained production runs.
Highlights
- 135-degree split point starts on contact without walking
- #22 wire-gauge drill bit fits tight aerospace fasteners
- 2-inch drilling depth reaches through stacked structures
- High-speed steel with black oxide resists wear in hard alloys
- 28-degree helix clears chips efficiently in deep holes
Specifications
| Brand | CHICAGO-LATROBE |
|---|
Questions about this item
Will the #22 drill bit fit the existing 3/8-inch chuck on my older drill press?
The #22 drill bit has a standard round shank that fits a 3/8-inch chuck, so it will work with your older drill press.
How can I confirm the 135-degree split point is cutting correctly after I start drilling?
The 135-degree split point should self-centre and produce short, curly chips in steel; if the bit walks or creates long strings, the point may be dull.
Does the package include a protective case or just the single 11146 extension drill?
The product ships as a single 11146 aircraft extension drill; no case or additional accessories are included.
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