Chicago-Latrobe
Chicago-Latrobe 44427 27/64 in 118° Left-Hand Helix Jobber Drill Bit
A 27/64 inch high-speed steel jobber drill bit with a 118 degree left-hand helix for removing broken fasteners
- TypeDrill Bits
- 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.
Highlights
- 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
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
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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