Chicago-Latrobe
Chicago-Latrobe 70231 31/64 in 118° HSS TiN jobber drill
A 31/64 inch high-speed steel jobber drill bit with a 118-degree point and TiN coating for general-purpose drilling
- TypeDrill Bits
- Precise 31/64 inch holes with 118-degree point angle
- TiN coating on high-speed steel resists wear
- Conventional point starts cleanly without walking
- Jobber length reaches standard drilling depths
- Decimal equivalent .4844 matches fractional sizing exactly
Chicago-Latrobe 31/64 inch jobber drill
This Chicago-Latrobe 70231 drill bit is a 31/64 inch fractional-size tool made from high-speed steel with a titanium nitride coating. It features a conventional 118 degree point angle and a jobber-length flute design. The decimal equivalent is .4844 inches and the bit has no coolant-through holes.
Suited for general-purpose drilling in metal.
The 118 degree point works well for hand-held or machine drilling across common materials. Buyers who need a split-point tip for faster starts, a cobalt substrate for harder alloys, or a coolant-through design for deep-hole chip evacuation should look at other options.
31/64 inch fractional diameter
This single dimension determines whether the bit matches the hole size required by the job. Verify the .4844 inch decimal equivalent against the drawing or tap chart before ordering.
Highlights
- Precise 31/64 inch holes with 118-degree point angle
- TiN coating on high-speed steel resists wear
- Conventional point starts cleanly without walking
- Jobber length reaches standard drilling depths
- Decimal equivalent .4844 matches fractional sizing exactly
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
Questions about this item
How do I install the 31/64 in jobber drill bit, and what step is often missed?
Insert the bit fully into the drill chuck, tighten the jaws evenly on the shank, and confirm the 118° point runs true before drilling.
What maintenance or replacement will the 70231 drill bit need later?
The TiN coating on the high-speed steel reduces wear; resharpen the 118° conventional point when cutting edges dull, or replace the bit if the shank damages.
What limit appears first on the 31/64 in drill bit during sustained drilling?
Heat buildup at the 118° point softens the high-speed steel, causing the TiN coating to degrade and the cutting edges to lose sharpness.
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