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Thin black oxide drill bit, 135 degree split point, 11001 model

Chicago-Latrobe

Chicago-Latrobe 11001 135 Degree Aircraft Extension Drill 1/16 in 28 Degrees

SKU CH-5Z2E-929ZR

A 1/16-inch aircraft extension drill with a 135-degree split point for self-centering starts and 28-degree helix for chip clearance

  • 135° split point starts cleanly on contact
  • 1/16 in drill bit drills precise pilot holes
  • 7/8 in maximum depth reaches through thin sheet
  • High-speed steel with black oxide resists wear
  • 28° helix clears chips in deep drilling

Chicago-Latrobe 11001 Aircraft Extension Drill

The Chicago-Latrobe 11001 is a 135-degree NAS-type aircraft extension drill made from high-speed steel with a black oxide finish. It features a 1/16 inch fractional drill bit size and a split point design for accurate starts. This tool is built for machining high-performance applications requiring extended reach.

Suited for precision drilling in aerospace

This drill suits professionals creating deep holes in hard materials where a 135-degree split point reduces walking. The 7/8 inch maximum drilling depth supports through-hole tasks in thick stock. Buyers needing larger diameters or different point angles should look at other options.

135-degree split point geometry defines

The 135-degree point angle with split point geometry centres the bit instantly on contact, preventing drift on curved or hardened surfaces. Combined with high-speed steel construction, it delivers clean holes at the specified 4xD depth ratio. This specific angle determines suitability for your material hardness.

How it compares

Measured against everything we stock in Power Drills, Drivers & Cutting Bits, at today’s prices. Recalculated every night.

Price $2.99
Cheaper than about 98% of the 2,412 comparable items (median $81.99).

Specifications

Product
Brand nameCHICAGO-LATROBE

Questions about this item

How do I install the 135-degree split-point drill bit correctly, and what step do people often miss?

Chuck the 1/16-inch shank securely in a drill press or hand drill, align the split point with the centre mark, and apply steady pressure — the step many skip is using a pilot hole or centre punch to prevent the bit from wandering on hard material.

What maintenance or replacement will this high-speed steel bit need later?

The black-oxide coating resists corrosion, but the cutting edges will dull with use; resharpen the 135-degree split point on a drill grinder or replace the bit once the 7/8-inch flute length shows excessive wear or chipping.

What limit appears first during sustained drilling with this 4xD extension drill?

The 28-degree helix angle optimises chip evacuation, yet the 7/8-inch maximum drilling depth is reached quickly in deep holes, so hole depth becomes the practical limit before heat buildup in the high-speed steel body.

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