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Chicago-Latrobe 11171 aircraft extension drill bit #47 black oxide finish

Chicago-Latrobe

Chicago-Latrobe 11171 135 Degree NAS-Type Aircraft Extension Drill #47 28 Degrees High Speed Steel Black Oxide

SKU CH-7ZCH-RVTTQ

A #47 aircraft extension drill with a 135-degree split point made from high-speed steel with black oxide coating

  • 135° split point reduces walking for accurate starts
  • #47 wire-gauge size drills precise small-diameter holes
  • High-speed steel with black oxide resists wear during extended use
  • 28° helix angle clears chips efficiently in deep cuts
  • 11171 NAS-type design meets aircraft extension drilling requirements

Chicago-Latrobe 11171 Aircraft Extension Drill

The Chicago-Latrobe 11171 is a NAS-type aircraft extension drill designed for precision drilling in aerospace and industrial applications. It suits machinists and maintenance technicians who require extended reach for deep or hard-to-access holes.

135-Degree Split Point with Black Oxide

The 135-degree split point reduces thrust and prevents walking, improving accuracy on contact. High-speed steel construction with black oxide finish enhances wear resistance and chip flow during deep-hole drilling operations.

Straightforward Chuck Installation

The drill installs directly into a standard chuck without adapters. The 4xD length and one-inch maximum drilling depth require steady feed pressure to avoid deflection or breakage in harder materials.

How it compares

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

Price $9.99
Cheaper than about 93% of the 2,412 comparable items (median $81.99).

Specifications

Product
Brand nameCHICAGO-LATROBE

Questions about this item

When will the #47 high-speed steel bit need replacement?

Replace the bit once the split point dulls enough that it no longer self-centres or requires excessive feed pressure.

What limits continuous drilling depth in one pass?

The flute length allows a maximum drilling depth of 1 inch before chips must be cleared.

How hot does the black-oxide finish get during all-day use?

The coating reduces friction, but sustained drilling will still heat the bit; allow cooling intervals to preserve temper.

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