Chicago-Latrobe
Chicago-Latrobe 54119 135 Degree Cobalt Jobber Drill Bit T .3580 TiN Split Point
A 135-degree cobalt jobber drill bit with TiN coating and split point for size T holes at .3580 decimal equivalent
- TypeDrill Bits
- MaterialHAWA
- Cobalt construction resists heat and wear
- 135-degree split point starts holes without walking
- TiN coating reduces friction for longer life
- Jobber length reaches deeper into workpieces
- Letter size T equals .3580 decimal equivalent
Chicago-Latrobe 54119 Cobalt Jobber Bit
The Chicago-Latrobe 54119 is a jobber-length drill bit made from cobalt steel with a titanium nitride coating. It is sized to letter T with a decimal equivalent of .3580. The 135-degree split point reduces walking and improves starting accuracy in hard materials. This bit suits mechanics and fabricators drilling stainless steel, titanium or high-strength alloys.
Upgrade from standard high-speed steel bits
Cobalt construction withstands higher heat and wear than general-purpose HSS when drilling tough metals. The TiN coating further reduces friction and extends cutting life in repetitive operations. The jump is worth it when standard bits dull quickly or fail to hold size in abrasive workpieces. It does not serve applications needing coolant-through capability or carbide-grade rigidity.
Straightforward chuck mounting with standard shank
The straight shank fits common three-jaw chucks without adapters or special holders. Split point geometry minimises the need for centre punching on flat surfaces. Common issues include chatter if the workpiece is not rigidly clamped or if feed pressure is inconsistent. Overheating can still occur in deep holes without peck drilling or external lubrication.
Highlights
- Cobalt construction resists heat and wear
- 135-degree split point starts holes without walking
- TiN coating reduces friction for longer life
- Jobber length reaches deeper into workpieces
- Letter size T equals .3580 decimal equivalent
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
Questions about this item
Will this 0.3580-inch cobalt bit fit a standard 3/8-inch drill chuck?
Yes, the shank diameter matches the letter-T size so it clamps securely in any 3/8-inch or larger chuck.
How do I start a hole with the 135-degree split point without the bit walking?
Apply firm pressure at low RPM; the split point self-centres, but easing off too early lets the bit skate on hard steel.
When should I replace this TiN-coated cobalt bit?
Replace it once the gold coating wears through at the cutting lips or the split point no longer centres cleanly in stainless.
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