Chicago-Latrobe
Chicago-Latrobe 11172 #48 135° NAS aircraft extension drill
A #48 aircraft extension drill with a 135° split point, high-speed steel construction, black oxide finish and 28° helix for wire and 4xD depth
- 135° split point starts holes precisely
- #48 wire-gauge size matches NAS specifications
- 1 in maximum drilling depth handles extended reach
- High-speed steel with black oxide resists wear
- 28° helix clears chips efficiently
Chicago-Latrobe 11172 #48 Aircraft Extension Drill
This Chicago-Latrobe 11172 extension drill is a high-performance cutting tool designed for precision drilling in aerospace applications. It features a #48 wire gauge size and a 135-degree split point for accurate starts and reduced walking. The black oxide finish on high-speed steel provides durability and corrosion resistance for demanding machining tasks.
Suited for deep-hole drilling in tight access areas
This drill suits machinists and technicians creating deep holes up to 1 inch in confined spaces where a standard bit cannot reach. The 4xD length and 28-degree helix angle support efficient chip evacuation in deep drilling operations. It is not for buyers who need larger diameter holes or standard-length bits for general-purpose fastening work.
135-degree split point geometry
The 135-degree split point is the critical specification that determines suitability for hard materials and precision starts. This geometry centres the drill instantly without a centre punch, reducing thrust and heat generation in high-performance machining grades. Verify that your application requires this specific point angle and #48 wire size before purchasing.
Highlights
- 135° split point starts holes precisely
- #48 wire-gauge size matches NAS specifications
- 1 in maximum drilling depth handles extended reach
- High-speed steel with black oxide resists wear
- 28° helix clears chips efficiently
Specifications
| Brand | CHICAGO-LATROBE |
|---|
Questions about this item
Which size should I pick if the job calls for a #48 wire-gauge hole?
This drill is manufactured as a #48 wire-gauge bit, so it matches that specification directly.
What does the 135-degree split point do once the bit is in the drill?
The 135-degree split point reduces walking and starts the cut cleanly in tough alloys without a centre punch.
How does the 28-degree helix angle affect chip removal in deep holes?
The 28-degree helix is optimised for the 4xD depth rating, pulling chips out efficiently in holes up to one inch deep.
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