Chicago-Latrobe
Chicago-Latrobe 54120 135° Cobalt Jobber Drill Bit .3680
Drills precise holes with a 135-degree split-point cobalt bit at .3680 diameter
- TypeDrill Bits
- MaterialHAWA
- 135° split point starts on contact without wandering
- Cobalt steel with TiN coating resists heat and wear
- .3680 inch letter U size fits precise hole specs
- Jobber length gives standard reach for general drilling
- Heavy-duty construction handles tough materials cleanly
Heavy-Duty Cobalt Jobber Bit
The Chicago-Latrobe 54120 is a cobalt steel drill bit built for heavy-duty drilling in tough materials. Its 135-degree split point reduces walking and starts holes cleanly without a centre punch. The bit suits professional workshops and maintenance teams that need reliable performance on stainless steel, cast iron and high-strength alloys.
135-Degree Split Point Geometry
The split-point design self-centres on contact, limiting the need for pilot holes in many applications. Cobalt construction resists heat better than standard high-speed steel, extending edge life when drilling abrasive or work-hardening metals. The TiN coating further reduces friction and wear, though the bit is not coolant-fed, so chip evacuation relies on regular pecking.
Standard Jobber Shank Fit
The straight shank fits any three-jaw chuck or collet that accepts jobber-length bits, so no special holders are required. Common issues include premature dulling if feed pressure is too light, causing rubbing instead of cutting, and breakage if the workpiece shifts during deep holes. Use cutting fluid and maintain steady pressure for best results.
Highlights
- 135° split point starts on contact without wandering
- Cobalt steel with TiN coating resists heat and wear
- .3680 inch letter U size fits precise hole specs
- Jobber length gives standard reach for general drilling
- Heavy-duty construction handles tough materials cleanly
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
Questions about this item
Which drill-bit size should I choose for a .3680-inch hole?
This bit is the size U letter gauge with a .3680 decimal equivalent, so it directly matches that hole diameter.
How does the 135-degree split point perform once the bit is in the drill?
The 135-degree split point centres without a pilot hole, reduces walking and cuts faster in hard materials.
What does the cobalt TiN combination mean for the cutting interface?
Cobalt steel resists heat while the TiN coating lowers friction, together extending edge life in stainless and alloy steels.
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