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Chicago-Latrobe 11112 aircraft extension drill 5/16 inch black oxide high speed steel split point 135 degree

Chicago-Latrobe

Chicago-Latrobe 11112 135° NAS Aircraft Extension Drill 5/16

SKU CH-YM7Z-VDNZH

135-degree split-point high-speed steel aircraft extension drill with black oxide finish for deep-hole drilling

  • 135° split point reduces walking on hard metals
  • 5/16 inch high-speed steel handles demanding drilling tasks
  • 28° helix angle clears chips efficiently from deep holes
  • 3 3/16 inch depth capacity reaches confined aircraft structures
  • Black oxide finish resists corrosion during extended use

Chicago-Latrobe 11112 Aircraft Extension Drill

The Chicago-Latrobe 11112 is a NAS-type aircraft extension drill built for deep-hole drilling in aviation maintenance and manufacturing. Its 5/16 inch fractional size and extended reach suit professional mechanics and technicians working on airframe structures.

Sustained drilling performance

The 135-degree split point centres the bit quickly and reduces thrust, lowering heat buildup during continuous operation. High-speed steel with a black oxide finish resists wear when drilling through tough alloys at the 28-degree helix angle over the full 3 3/16 inch depth.

Practical limits of the 4xD standard

The 4xD length-to-diameter ratio defines the maximum stable drilling depth at 3 3/16 inches before deflection becomes excessive. Chip evacuation grows difficult beyond this limit, so the bit is not intended for deeper holes or rigid CNC-only tooling.

How it compares

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

Price $15.99
Cheaper than about 88% of the 2,412 comparable items (median $81.99).

Specifications

Product
Brand nameCHICAGO-LATROBE

Questions about this item

Will the 135-degree split point on the 11112 drill bit reduce heat buildup during extended drilling sessions?

The 135-degree split point is designed for self-centering and faster penetration, which helps reduce thrust force and heat generation when drilling deep holes in tough materials.

Do I need a specific chuck size or drill press to use the 5/16-inch shank on this aircraft extension drill?

You need a drill chuck that accommodates a 5/16-inch shank diameter; the extended length requires a stable drill press or rigid handheld drill to prevent wobble.

Can the 11112 high-speed steel bit with black oxide finish effectively drill the older rivet holes in my restoration project?

Yes, the high-speed steel construction and black oxide finish provide the wear resistance needed for drilling into existing rivet holes and hardened materials.

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