Chicago-Latrobe
Chicago-Latrobe 40580 11/32 in 135 Degree NAS Aircraft Extension Drill
An aircraft extension drill bit with a 135-degree split point for high-speed steel drilling up to 63/64 in depth
- TypeDrill Bits
- MaterialHAWA
- 11/32 inch size drills precise holes in aircraft structures
- 135-degree split point starts cleanly without wandering
- High-speed steel with black oxide resists wear and heat
- 28-degree helix clears chips efficiently during deep drilling
- 63/64 inch maximum depth reaches through thick workpieces
Aircraft Extension Drill 11/32 in
The Chicago-Latrobe 40580 is an aircraft extension drill with a fractional size of 11/32 in. It features a 135-degree split point made from high speed steel with a black oxide finish. The material grade is machining high performance. This drill suits maintenance and assembly tasks requiring extended reach in aerospace or general metalwork.
135 Degree Split Point Limits
The 135-degree split point reduces walking on hard surfaces but demands rigid setups to prevent chatter. Maximum drilling depth is 63/64 in at a 4xD ratio, so deeper holes need peck cycles or a shorter bit. High speed steel withstands moderate heat yet dulls faster than cobalt in abrasive alloys. The 28-degree helix angle optimises chip evacuation in aluminium and mild steel.
High Speed Steel Build and Shank
Black oxide coating adds lubricity and corrosion resistance during repeated use. The straight shank fits standard drill chucks and quick-change adapters without special collets. Extended length allows access inside wing spars or fuselage frames where a stubby bit cannot reach. Buyers who need carbide wear life or coolant-through capability should select a different tool class.
Highlights
- 11/32 inch size drills precise holes in aircraft structures
- 135-degree split point starts cleanly without wandering
- High-speed steel with black oxide resists wear and heat
- 28-degree helix clears chips efficiently during deep drilling
- 63/64 inch maximum depth reaches through thick workpieces
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
Questions about this item
Which size and point angle should I choose for aircraft extension drilling?
This drill is 11/32 in with a 135 degree split point designed for NAS-type aircraft extension work.
How does the 135 degree split point perform in a real machine?
The 135 degree split point reduces walking and starts cutting faster in tough alloys, while the black oxide finish helps retain lubricity during deep holes.
What does the 4xD designation mean for maximum drilling depth?
4xD indicates a maximum drilling depth of 63/64 in, or four times the 11/32 in diameter, suitable for through-hole extension drilling.
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