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Bright steel jobber drill bit, 27/64 inch, 118 degree left-hand helix

Chicago-Latrobe

Chicago-Latrobe 44427 27/64 in 118° Left-Hand Helix Jobber Drill Bit

SKU CH-ZYAZ-6MPJR

A 27/64 inch high-speed steel jobber drill bit with a 118 degree left-hand helix for removing broken fasteners

  • Product typeDrill Bits
  • Main materialHAWA
  • Left-hand helix removes broken fasteners without damaging threads
  • 118° conventional point starts accurately on hard materials
  • High-speed steel construction resists wear during repetitive drilling
  • 27/64 inch fractional size fits standard jobber chucks
  • Bright uncoated finish allows easy inspection of cutting edges

Precision Left-Hand Jobber Bit

The Chicago-Latrobe 44427 is a 27/64 inch jobber-length drill bit designed for left-hand helix operation. Its 118-degree conventional point angle suits general-purpose drilling in metal, plastic and wood. The fractional-inch sizing matches standard imperial tooling requirements. This new, uncoated high-speed steel bit serves maintenance, repair and fabrication tasks where reverse rotation is needed.

Thermal And Power Behaviour

High-speed steel construction dissipates heat steadily during normal drilling cycles. The bright, uncoated finish avoids coating-related friction changes. With zero coolant holes, the bit relies on external lubrication or air cooling for sustained cuts. Power draw follows the host drill motor; the left-hand helix does not alter electrical demand.

Build And Daily Use

The HAWA-grade high-speed steel body resists wear in repetitive use. A conventional 118-degree point starts cleanly without a pilot hole in most materials. The 0.4219 inch decimal equivalent simplifies fixture set-up. Left-hand helix geometry clears chips effectively when run in reverse, useful for extracting broken fasteners. No coolant-through capability means dry or flood cooling only.

How it compares

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

Price $14.99
Cheaper than about 77% 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 27/64 in jobber drill bit and what step is often missed?

Chuck the bit securely in a drill press or hand drill, ensuring the 118° conventional point seats straight; the step many miss is centre-punching the workpiece so the left-hand helix does not walk on hard steel.

What maintenance or replacement will the 44427 bit need later?

The bright high-speed steel cutting edges dull with use; resharpen the 118° point on a bench grinder or replace the bit once the flutes no longer clear chips cleanly.

What limit appears first on the 27/64 in bit during sustained drilling?

Heat buildup in the uncoated high-speed steel causes the 118° point to lose hardness fastest, so cutting speed must drop once the bit discolours.

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