Chicago-Latrobe
Chicago-Latrobe 42785 135° Jobber Drill Bit O .3160 TiAlN
Drills precise 0.3160 inch holes with a 135-degree split point and TiAlN coating for extended life
- TypeDrill Bits
- 135° split point starts on contact for accurate holes
- TiAlN coating resists heat and wear for longer life
- Jobber length gives standard reach for general drilling
- High-speed steel construction handles tough materials reliably
- Size O (.3160) fits precise letter-gauge requirements
Chicago-Latrobe 42785 Jobber Drill Bit
The Chicago-Latrobe 42785 is a high-speed steel jobber drill bit sized to letter O with a decimal equivalent of .3160. It features a 135 degree split point designed for accurate starting and reduced walking in metalworking applications. A TiAlN coating provides increased hardness and heat resistance for extended tool life. This bit suits machinists and maintenance technicians drilling medium-duty holes in ferrous materials.
Sustained drilling performance with TiAlN coating
Under continuous load the TiAlN surface maintains hardness at elevated temperatures better than uncoated high-speed steel. The 135 degree split point geometry reduces thrust requirements, which helps preserve cutting edges during repeated operations. As a non-coolant-through design with zero coolant holes, heat evacuation relies on chip clearance and external lubrication. Heavy-duty web construction adds rigidity to resist deflection in deeper cuts.
Installation fits standard drill chucks
The straight shank seats directly into three-jaw chucks and quick-change adapters without additional bushings. Split-point geometry eliminates the need for centre punching in most materials, reducing setup time. Common issues include premature wear if cutting fluid is omitted in stainless or high-alloy steels, and chatter if the workpiece is not rigidly clamped. Re-sharpening must preserve the 135 degree angle to retain self-centring behaviour.
Highlights
- 135° split point starts on contact for accurate holes
- TiAlN coating resists heat and wear for longer life
- Jobber length gives standard reach for general drilling
- High-speed steel construction handles tough materials reliably
- Size O (.3160) fits precise letter-gauge requirements
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
Questions about this item
Does the 135° split point on the 42785 reduce heat buildup during all-day drilling?
The 135° split point is designed to centre quickly and cut efficiently, which helps limit heat during extended use.
What shank type does the .3160 bit need so my drill chuck will accept it?
It has a standard straight shank that fits any three-jaw chuck sized for jobber-length bits.
Will the TiAlN coating on this O-size bit wear faster when I drill older mild-steel stock?
TiAlN resists abrasion and heat, so it maintains edge life even in older, work-hardened mild steel.
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