Chicago-Latrobe
Chicago-Latrobe 44420 5/16 in 118° Left-Hand Jobber Drill Bit
Left-hand helix jobber drill bit in high-speed steel with a 118-degree point for reverse drilling tasks
- TypeDrill Bits
- MaterialHAWA
- Left-hand helix removes broken bolts efficiently
- 118-degree point angle starts holes accurately
- 5/16 inch diameter suits common tasks
- High-speed steel resists wear during use
- Bright finish prevents coating buildup inside holes
5/16 in Left-Hand Jobber Drill
The Chicago-Latrobe 44420 is a fractional-inch jobber-length drill bit measuring 5/16 inch with a 118-degree conventional point. It is manufactured from high-speed steel with a bright uncoated finish and features a left-hand helix for reverse cutting applications. The decimal equivalent is .3125 inch.
Machinists needing reverse extraction
This bit suits machinists and maintenance technicians who need to remove broken fasteners or create threads for left-hand screws. The left-hand helix pulls chips away from the operator during reverse operation. Buyers requiring coolant-through capability or a coated surface for extended wear in abrasive materials should look elsewhere.
5/16 inch capacity in steel and alloys
The .3125-inch diameter handles general-purpose drilling in steel, cast iron and non-ferrous alloys at standard jobber lengths. The 118-degree point centres quickly without a pilot hole in most materials. The uncoated high-speed steel substrate limits tool life in high-temperature alloys or prolonged production runs where heat buildup accelerates wear.
Highlights
- Left-hand helix removes broken bolts efficiently
- 118-degree point angle starts holes accurately
- 5/16 inch diameter suits common tasks
- High-speed steel resists wear during use
- Bright finish prevents coating buildup inside holes
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
Questions about this item
What size drill chuck is required for the 5/16 in shank on this 44420 bit?
A chuck capacity of at least 5/16 in or 0.3125 in is needed to grip the jobber-length shank securely.
Can the left-hand helix on this 118 degree point bit remove a broken fastener in a standard right-hand threaded hole?
Yes, the left-hand cutting action backs out right-hand threaded screws or bolts when run in reverse.
How do I confirm the 44420 bit is cutting correctly after chucking it up?
Run the drill in reverse; the bright high-speed steel flutes should pull chips out of the hole and the point should self-centre without wandering.
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