Chicago-Latrobe
Chicago-Latrobe 54071 27/64 in 135 Degree Cobalt Jobber Drill Bit
A 27/64 inch cobalt jobber drill bit with a 135 degree split point for heavy-duty drilling
- TypeDrill Bits
- Cobalt construction resists heat and wear during heavy drilling
- 135-degree split point reduces walking for accurate hole starts
- TiN coating extends cutting life in tough materials
- 27/64 inch fractional size suits standard jobber applications
- Decimal equivalent .4219 simplifies precise depth planning
Chicago-Latrobe 54071 Drill Bit
This Chicago-Latrobe 54071 is a 27/64 inch jobber length drill bit built for heavy-duty drilling tasks. It suits mechanics and fabricators who need a cobalt tool with a 135 degree split point for accurate starts in tough metals.
Cobalt construction with TiN coating
The cobalt substrate resists heat and wear during normal drilling operations. A TiN coating reduces friction, helping to keep temperatures lower and extending cutting life under typical workshop loads.
135 degree split point under sustained load
The 135 degree split point maintains centring and chip evacuation during prolonged cuts in hard materials. Cobalt hardness supports consistent performance when drilling deep or repeated holes without coolant through the tool.
Highlights
- Cobalt construction resists heat and wear during heavy drilling
- 135-degree split point reduces walking for accurate hole starts
- TiN coating extends cutting life in tough materials
- 27/64 inch fractional size suits standard jobber applications
- Decimal equivalent .4219 simplifies precise depth planning
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
Questions about this item
How do I install the 27/64 in cobalt jobber drill bit and what step do people often get wrong?
Insert the 135 degree split point shank fully into the chuck and tighten securely. The common mistake is not seating the bit completely, which causes run-out and premature wear on the cobalt cutting edges.
What maintenance or replacement will the 27/64 in cobalt drill bit need later?
The cobalt construction resists heat, but the TiN coating and 135 degree split point will dull over time. Resharpening requires a cobalt-capable grinder to maintain the original point angle and split point geometry for accurate drilling.
What limit appears first on the 27/64 in cobalt bit during sustained drilling?
Heat buildup at the 135 degree split point is the primary limit. Without coolant-through capability, the TiN coating and cobalt substrate can overheat in deep holes, reducing edge life and requiring frequent pecking cycles to clear chips.
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