Chicago-Latrobe
Chicago-Latrobe 43794 135 Degree Heavy-Duty Jobber Length Drill
A 135-degree split-point jobber drill bit in high-speed steel with TiCN coating, sized at .3970 decimal equivalent
- TypeDrill Bits
- 135° split point reduces walking for accurate hole starts
- TiCN coating extends tool life in tough materials
- High-speed steel construction handles heavy-duty drilling tasks
- Jobber length provides versatile reach for common applications
- Decimal size .3970 matches letter-gauge specifications
Chicago-Latrobe 43794 Jobber Drill Bit
This Chicago-Latrobe 43794 drill bit features a 135 degree split point design for accurate starts in metal. The heavy-duty jobber length suits general-purpose drilling tasks in workshop and maintenance environments. It targets machinists and technicians who need reliable hole-making performance. High-speed steel construction provides durability across a range of ferrous materials.
TiCN Coated High-Speed Steel Construction
The TiCN coating increases surface hardness and wear resistance compared to uncoated bits. This reduces friction during operation and extends tool life in repetitive drilling cycles. The non-coolant-through design means the bit relies on external lubrication or air cooling. Users must supply cutting fluid or compressed air to manage heat effectively in deep holes.
Sustained Drilling Performance Characteristics
Under continuous load, the split point geometry maintains centering without wandering. The coating helps dissipate heat generated during prolonged cuts in tough alloys. Decimal size .3970 matches specific letter gauge requirements for precision fits. The lack of coolant holes requires periodic withdrawal to clear chips and prevent binding.
Highlights
- 135° split point reduces walking for accurate hole starts
- TiCN coating extends tool life in tough materials
- High-speed steel construction handles heavy-duty drilling tasks
- Jobber length provides versatile reach for common applications
- Decimal size .3970 matches letter-gauge specifications
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
Questions about this item
How does the 135 degree split point behave when the bit gets hot during extended drilling?
The 135 degree split point is designed to reduce walking and require less thrust, which helps maintain centering even as temperatures rise during sustained use.
Does the TiCN coating on this 0.3970 inch bit keep noise or heat lower during all-day operation?
The TiCN coating increases surface hardness and reduces friction, which can lower heat buildup and dampen vibration compared to uncoated high-speed steel.
What shank style does the 43794 jobber bit have so I know if my drill chuck will accept it?
This bit has a straight round shank sized to its 0.3970 inch diameter, fitting any standard three-jaw drill chuck that opens to at least that size.
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