Chicago-Latrobe
Chicago-Latrobe 48928 Screw Machine Drill Bit 7/16 in 118° Left Hand
A 7/16-inch left-hand high-speed steel drill bit with a 118-degree point for screw-machine work
- TypeDrill Bits
- MaterialHAWA
- Left-hand cutting removes broken fasteners easily
- 118-degree point starts holes without wandering
- High-speed steel resists wear in tough materials
- Bright finish prevents coating buildup in threads
- 7/16-inch diameter matches standard tap sizes
Chicago-Latrobe 48928 Screw Machine Drill Bit
The Chicago-Latrobe 48928 is a screw machine drill bit sized at 7/16 inch with a decimal equivalent of .4375. It features a 118 degree conventional point angle and a left hand cutting direction. Made from high speed steel with a bright uncoated finish, it is designed for non-coolant through applications. Machinists and maintenance technicians use it for precision drilling in screw machine operations.
Replaces worn or damaged left hand screw machine
This bit replaces a dull or broken left hand screw machine drill bit of the same 7/16 inch size and 118 degree point geometry. The upgrade is worth it when the existing tool no longer holds tolerance or produces poor hole quality in high speed steel workpieces. A fresh high speed steel bit restores cutting efficiency and reduces cycle time. It is not for right hand cutting requirements or coolant through tooling systems.
Straightforward installation in standard tool
The bit installs directly into compatible screw machine collets or chucks that accept a 7/16 inch shank. No special adapters or torque settings are required beyond standard machine setup procedures. What usually goes wrong is inserting the bit into a right hand rotation spindle, which prevents cutting and damages the cutting edges. Operators must verify left hand spindle rotation before starting the cycle.
Highlights
- Left-hand cutting removes broken fasteners easily
- 118-degree point starts holes without wandering
- High-speed steel resists wear in tough materials
- Bright finish prevents coating buildup in threads
- 7/16-inch diameter matches standard tap sizes
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
Questions about this item
What size drill chuck is required for the 7/16 in shank on this bit?
A chuck capacity of at least 7/16 in or 0.4375 in is needed to grip the shank securely.
How do I install this left-hand bit in a standard drill motor?
Insert the shank fully, tighten the chuck firmly, and run the motor in reverse so the left-hand flutes cut correctly.
When should this high-speed steel bit be resharpened or replaced?
Resharpen the 118° point when cutting edges dull or chip; replace the bit if the shank wears or the flutes crack.
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