Chicago-Latrobe
Chicago-Latrobe 11143 #19 135° NAS Aircraft Extension Drill
A #19 aircraft extension drill bit with a 135-degree split point for high-performance machining in wire applications
- #19 drill bit targets precise wire-gauge holes
- 135° split point starts cleanly without wandering
- High-speed steel with black oxide resists wear
- 28° helix clears chips in deep cuts
- 4×D reach accesses confined aircraft structures
Aircraft Extension Drill #19
The Chicago-Latrobe 11143 is a NAS-type aircraft extension drill sized for #19 wire gauge holes. It is built for aerospace maintenance and manufacturing tasks that demand precise, deep-hole drilling in tough alloys. The 135-degree split point reduces walking on hard surfaces and starts the cut cleanly without a centre punch.
Sustained drilling behaviour
High-speed steel with a black oxide finish resists heat build-up during extended drilling cycles in high-performance machining grades. The 28-degree helix angle clears chips efficiently from the 2 1/8 in maximum drilling depth, preventing packing that would otherwise stall the cut. A 4xD length-to-diameter ratio provides reach without excessive deflection under load.
Practical limits of the HSS interface
High-speed steel performs reliably in ferrous and non-ferrous aerospace materials but loses hardness faster than cobalt or carbide when temperatures exceed its tempering range. The black oxide coating aids lubricity yet does not substitute for proper cutting fluid in deep holes. Users needing longer tool life in abrasive composites or hardened steels should evaluate alternative substrate materials.
Highlights
- #19 drill bit targets precise wire-gauge holes
- 135° split point starts cleanly without wandering
- High-speed steel with black oxide resists wear
- 28° helix clears chips in deep cuts
- 4×D reach accesses confined aircraft structures
Specifications
| Brand | CHICAGO-LATROBE |
|---|
Questions about this item
Does the 135-degree split point on the #19 bit reduce heat when drilling deep holes?
The 135-degree split point is designed for efficient chip removal which helps manage heat during extended drilling sessions.
What chuck size do I need to hold the #19 shank on this drill bit?
The #19 wire gauge shank requires a chuck that accommodates its specific diameter for secure clamping.
Will the 135-degree point angle work with my older high-speed steel drill press setup?
The 135-degree split point is a standard geometry compatible with conventional drill presses and older tooling setups.
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