Chicago-Latrobe
Chicago-Latrobe 11023 135 Degree NAS-Type Aircraft Extension Drill 25/64 in
Aircraft extension drill with 135-degree split point in high-speed steel, black oxide finish, 25/64 inch size for deep-hole machining
- 135-degree split point starts drilling on contact without walking
- 25/64-inch diameter suits precise fractional-inch hole requirements
- 3 3/4-inch flute length reaches deep into workpieces
- High-speed steel with black oxide resists wear and reduces friction
- NAS-type aircraft extension design built for demanding machining tasks
Aircraft Extension Drill 11023
This Chicago-Latrobe drill bit is a NAS-type aircraft extension drill made from high-speed steel with a black oxide finish. It is designed for precision drilling in aviation maintenance and manufacturing where deep-hole access is required. The 135-degree split point improves centring and reduces thrust during operation.
25/64 inch capacity and 3 3/4 inch depth
The bit handles fractional inch drilling at 25/64 inch diameter with a maximum drilling depth of 3 3/4 inches, following a 4xD ratio. It performs best in high-performance machining grades up to 28 degrees. The geometry runs out when hole depth exceeds the flute length or when material hardness surpasses the high-speed steel rating.
135 degree split point and high-speed steel limits
The 135-degree point angle with split-point geometry centres the bit without a pilot hole, but the high-speed steel substrate limits sustained use in abrasive alloys or high-temperature applications. Black oxide provides lubricity and corrosion resistance, yet the coating wears under continuous heavy feed rates. The straight shank fits standard drill chucks and extension holders.
Highlights
- 135-degree split point starts drilling on contact without walking
- 25/64-inch diameter suits precise fractional-inch hole requirements
- 3 3/4-inch flute length reaches deep into workpieces
- High-speed steel with black oxide resists wear and reduces friction
- NAS-type aircraft extension design built for demanding machining tasks
Specifications
| Brand | CHICAGO-LATROBE |
|---|
Questions about this item
Will the 25/64 inch drill bit fit my existing 1/2 inch drill chuck?
Yes, the 25/64 inch diameter is smaller than a 1/2 inch chuck capacity, so it will fit securely in standard drill chucks that accept up to 1/2 inch shanks.
How can I verify the 135 degree split point is cutting correctly after setup?
The split point should self-centre without a centre punch, produce short chips in steel, and the black oxide finish will show even wear along both cutting lips when drilling at the proper 28 degree helix angle.
Does the 11023 come with a protective case or just the bare drill bit?
The 11023 is supplied as a single aircraft extension drill bit; no case, lubricant, or additional accessories are included in the package.
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