Chicago-Latrobe
Chicago-Latrobe 42031 31/64" HSS TiN 135° Jobber Drill Bit
A 31/64 inch high-speed steel jobber drill bit with a 135 degree split point and TiCN coating for accurate drilling
- TypeDrill Bits
- MaterialHAWA
- High-speed steel construction resists wear during heavy drilling
- 135-degree split point starts on contact without walking
- Titanium carbonitride coating reduces friction for faster cutting
- 31/64 inch diameter matches precise fractional sizing needs
- Jobber length balances reach and rigidity for general use
Chicago-Latrobe 42031 Jobber Drill Bit
This Chicago-Latrobe 42031 jobber drill bit is made from high speed steel with a TiCN coating. It features a 31/64 inch diameter and a decimal equivalent of .4844. The 135 degree split point design aids in accurate starts and reduces walking. It is a non-coolant through tool suited for general purpose drilling tasks.
Check shank fit and material compatibility
Verify that your drill chuck accepts a straight shank of this diameter before ordering. Confirm the workpiece material is suitable for high speed steel cutting tools. Ensure your equipment can run at appropriate speeds for a 31/64 inch bit. This bit does not have coolant through holes so external lubrication may be required.
Suits general metal drilling.
This bit suits machinists and maintenance technicians drilling ferrous and non-ferrous metals. It is not for operators who require through coolant capability for deep hole drilling. Buyers needing carbide tipped or cobalt substrates for hardened steels should look elsewhere. It also does not suit applications requiring a reduced shank for smaller chucks.
Highlights
- High-speed steel construction resists wear during heavy drilling
- 135-degree split point starts on contact without walking
- Titanium carbonitride coating reduces friction for faster cutting
- 31/64 inch diameter matches precise fractional sizing needs
- Jobber length balances reach and rigidity for general use
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
Questions about this item
What comes in the box with the 42031 drill bit and is anything else needed to use it?
The box contains the single 31/64 inch HSS TiCN jobber drill bit with a 135 degree split point. It fits standard three-jaw chucks so no separate adapter is required.
How do I decide between the 31/64 inch size and other fractional sizes in this same series?
Choose the 31/64 inch bit when the hole must be exactly .4844 inch decimal equivalent; each fractional size in the series matches a specific decimal diameter so select the one that matches your required hole size.
What does the 135 degree split point do when the bit is drilling in a hand-held drill?
The 135 degree split point centres the bit without a centre punch, reduces wandering on curved surfaces and lowers the thrust needed to start the cut in steel or other hard materials.
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