Chicago-Latrobe
Chicago-Latrobe 50853 Cobalt Screw Machine Drill Bit X 135° .3970
Cobalt screw-machine drill bit with 135° split point, X size (.3970), right-hand cutting
- TypeDrill Bits
- Cobalt steel resists heat during high-speed drilling
- 135° split point starts holes without wandering
- Right-hand cutting clears chips efficiently
- Straw finish identifies cobalt construction instantly
- Decimal size .3970 matches X gauge precisely
Cobalt drill bit for screw machines
This CHICAGO-LATROBE 50853 drill bit is made from cobalt steel for hardness and heat resistance. It is sized to X with a decimal equivalent of .3970 inches. The tool suits machinists and maintenance technicians drilling precise holes in tough alloys.
Split point and 135 degree angle
A 135 degree split point centres the bit on contact and reduces walking on hard surfaces. The right-hand cutting direction matches standard drill motors and CNC spindles. The straw finish identifies the cobalt material without a coating that could mask wear.
Non-coolant-through limitation
The bit lacks internal coolant passages so chips must be cleared by peck drilling or external flood coolant. Deep holes in stainless or high-temp alloys will need frequent withdrawal to prevent packing. Users needing through-tool coolant should select a different design.
Highlights
- Cobalt steel resists heat during high-speed drilling
- 135° split point starts holes without wandering
- Right-hand cutting clears chips efficiently
- Straw finish identifies cobalt construction instantly
- Decimal size .3970 matches X gauge precisely
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
Questions about this item
What does the 135-degree split point do for the Chicago-Latrobe 50853 cobalt bit?
The 135-degree split point reduces walking and starts the hole on contact, which is useful when drilling harder materials with a handheld or stationary drill.
What shank style does the Chicago-Latrobe 50853 use so I know if it fits my chuck?
It has a straight round shank that matches the decimal size .3970, so any three-jaw chuck that opens to at least that diameter will hold it.
What is the correct way to install this cobalt screw-machine bit and what step is often missed?
Open the chuck fully, insert the bit until the shank seats against the jaws, then tighten securely; the step often missed is verifying the bit runs true before applying feed pressure.
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