Chicago-Latrobe
Chicago-Latrobe 40572 135 Degree NAS-Type Aircraft Extension Drill 7/32 in High Speed Steel Black Oxide
A 135-degree split-point aircraft extension drill in 7/32-inch high-speed steel with black oxide finish
- TypeDrill Bits
- MaterialHAWA
- 135-degree split point starts holes cleanly on contact
- High-speed steel construction resists wear during repetitive drilling
- Black oxide finish reduces friction and heat buildup
- 28-degree helix angle clears chips efficiently from deep holes
- 7/8-inch maximum drilling depth reaches through thick workpieces
Chicago-Latrobe 40572 Extension Drill
This Chicago-Latrobe 40572 is a NAS-type aircraft extension drill made from high speed steel with a black oxide finish. It features a 135-degree split point and a 7/32 inch fractional size. The tool is designed for deep-hole drilling tasks where extended reach is necessary.
Suited for precision drilling in aviation
This drill suits machinists and maintenance technicians who need a 4xD reach and a 135-degree split point for accurate starting in tough materials. It is not for buyers who need a standard jobber-length bit or a different point angle for general-purpose work. Shops requiring carbide or cobalt substrates should look elsewhere.
135-degree split point angle
The 135-degree split point is the critical specification that determines if this bit matches the required hole geometry and material hardness. Verify that your application calls for this specific angle and a maximum drilling depth of 7/8 in before purchasing.
Highlights
- 135-degree split point starts holes cleanly on contact
- High-speed steel construction resists wear during repetitive drilling
- Black oxide finish reduces friction and heat buildup
- 28-degree helix angle clears chips efficiently from deep holes
- 7/8-inch maximum drilling depth reaches through thick workpieces
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
Questions about this item
Will the 135-degree split point on the 7/32-inch drill bit start cleanly in existing rivet holes without a centre punch?
The 135-degree split point is designed to self-centre and reduce walking, so it should engage existing rivet holes cleanly without a separate centre punch.
How can I verify the black-oxide coating is intact and the split point is sharp after first use?
Inspect the flute and tip under good light; the black-oxide finish should appear uniform with no bare steel showing, and the two cutting lips of the 135-degree split point should meet cleanly with no visible nicks.
Does the package contain only the single 7/32-inch aircraft extension drill or are additional bits included?
The listing describes a single aircraft extension drill bit sized 7/32 inch; no extra bits, pilots or accessories are mentioned as included.
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