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Chicago-Latrobe 40564 HSS extension drill bit 3/32 inch by 12 inch black oxide finish

Chicago-Latrobe

Chicago-Latrobe 40564 Extension Drill 3/32 x 12 in HSS Black Oxide

SKU CH-FYPY-KNCC0

A 12-inch high-speed steel extension drill with a 135-degree split point and black oxide finish for deep-hole drilling

  • Product typeDrill Bits
  • Main materialHAWA
  • 3/32 inch diameter drills precise pilot holes
  • 12 inch overall length reaches deep cavities
  • High Speed Steel construction resists heat buildup
  • 135 degree split point starts on contact

12-Inch Extension Drill for Deep Access

The Chicago-Latrobe 40564 extension drill reaches 12 inches to bore holes in deep or obstructed locations. Its 3/32-inch diameter suits precision fastening and pilot tasks. High-speed steel construction with black oxide finish resists wear during repetitive use. The 135-degree split point starts on contact and reduces walking on hard surfaces.

Low Heat and Stable Power Draw in Hand-Held Use

The black oxide coating lowers friction so the bit runs cooler during extended drilling cycles. Split-point geometry reduces the feed pressure needed, which keeps motor load steady on cordless or corded drivers. No coolant-through design means chips clear through the flutes without extra plumbing. The fractional 0.0938-inch size fits standard three-jaw chucks without adapters.

How it compares

Measured against everything we stock in Bits, Hole Saws & Accessory Kits, at today’s prices. Recalculated every night.

Price $8.99
Cheaper than about 90% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCHICAGO-LATROBE
Product typeDrill Bits
Size & build
Main materialHAWA

Questions about this item

How do I install the 40564 extension drill in my drill chuck, and what step do people get wrong?

Insert the 12 in shank fully into the chuck and tighten securely; the step often missed is not seating the split point shank deep enough, which causes runout.

What maintenance or replacement will the 40564 HSS black oxide bit need later?

Resharpen the 135 degree split point when cutting slows; the black oxide coating wears off over time, so replace the bit once the high speed steel shows excessive wear.

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